Application Data · 6 table 1 — uc open xp w/uc open xp io applications device (channel no.)...

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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-51390002-01 Printed in U.S.A. Form 39M-3XA Pg 1 9-12 Replaces: 39M-2XA Application Data CONTENTS Page INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Service Area Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . 2 CONTROL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Control Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 CONTROL HARDWARE . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14 Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Electric Heat Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 VALVE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-18 Two-Way Hot Water or Chilled Water Valves . . . . . . . . 14 Three-Way Mixing Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Two-Way Steam Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Alternate Valve Selection Procedure . . . . . . . . . . . . . . . . 17 Valve Ordering Information and Specifications . . . . . 17 DIRECT EXPANSION COOLING . . . . . . . . . . . . . . . . . . . . . 19 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Digital Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 WIRING GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Component Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 System Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 OPERATING SEQUENCES . . . . . . . . . . . . . . . . . . . . . . . 20-23 Constant Volume and Variable Air Volume Units . . . . . . . . . . . . . . . . . . . . . . . . 20 Constant Volume Units Only . . . . . . . . . . . . . . . . . . . . . . . . 20 Variable Air Volume Units Only . . . . . . . . . . . . . . . . . . . . . 22 Demand Controlled Ventilation . . . . . . . . . . . . . . . . . . . . . 23 GUIDE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 24-30 INTRODUCTION This book describes the Universal Controller Open XP (UC Open XP) and the control and sensor options available for the 39M air handlers. It details the features, benefits, selection pro- cedures and provides specific guidelines to ensure an effective system design for the Aero ® 39M air-handling units (AHU). Carrier’s Aero 39M central station air handlers provide heating, cooling and ventilation in constant volume (CV) and variable air volume (VAV) applications. The UC Open XP pro- vides easy-to-set, centralized management of all air-handling components. The UC Open XP is available for all 39M units. Aero 39M units can operate stand-alone or interface with BACnet*. If a control is installed as part of a network, it is con- nected to the BACnet communication bus with a field-installed cable (communication link). All factory-installed sensors, actuators and wiring are inter- nal to the unit. As shown in Fig. 1 and 2, the UC Open XP pres- ents an uncluttered outer surface with no factory-installed wires or controls extending outside the unit. Benefits RELIABLE — Inherent safeties and diagnostics within the control software properly protect equipment and quickly alert the operator to operation problems or potential problems. FLEXIBLE — Various options meet a variety of application requirements such as variable or constant volume, energy recovery, smoke control, and timed override. The UC Open XP is designed to function on a network with other system ele- ments to optimize and coordinate the operation of the mechani- cal equipment. COMPLIANT — When used with demand controlled ventila- tion (DCV), the UC Open XP Control System conforms to ASHRAE (American Society of Heating, Refrigerating, and Air Conditioning Engineers) 62 Indoor Air Quality Standards. BACnet ® 24VAC Gnd 24VAC, 50-60 Hz 20VA, 0.83A Use Copper Conductors Only UC Open XP (OPN-UCXP) Rnet Local Access Xnet Remote Expansion Gnd Xnet - Xnet + Gnd Rnet + Rnet - + 12V Gnd Rnet + Rnet - + 12V Sense BACnet Port Open Energy Management Equipement Pulse Count Ability Aux Pwr Out Fig. 1 — UC Open XP with the UC Open XP IO Expander Module a39-4347 UC Open XP/UC Open XP IO for 39MN,MW Indoor and Weathertight Outdoor Air Handlers * Sponsored by ASHRAE (American Society of Heating, Refrigerat- ing, and Air Conditioning Engineers).

Transcript of Application Data · 6 table 1 — uc open xp w/uc open xp io applications device (channel no.)...

Page 1: Application Data · 6 table 1 — uc open xp w/uc open xp io applications device (channel no.) cable no. wire color terminal signal filter status switch (channel # ui-1) white tb2-1

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-51390002-01 Printed in U.S.A. Form 39M-3XA Pg 1 9-12 Replaces: 39M-2XA

Application DataCONTENTS

PageINTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Service Area Requirements. . . . . . . . . . . . . . . . . . . . . . . . . .2CONTROL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Control Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3CONTROL HARDWARE . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Electric Heat Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13VALVE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-18Two-Way Hot Water or Chilled Water Valves . . . . . . . .14Three-Way Mixing Valves . . . . . . . . . . . . . . . . . . . . . . . . . . .14Two-Way Steam Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Alternate Valve Selection Procedure . . . . . . . . . . . . . . . .17Valve Ordering Information and Specifications . . . . .17DIRECT EXPANSION COOLING . . . . . . . . . . . . . . . . . . . . .19General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Digital Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19WIRING GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20Component Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20System Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20OPERATING SEQUENCES . . . . . . . . . . . . . . . . . . . . . . . 20-23Constant Volume and

Variable Air Volume Units . . . . . . . . . . . . . . . . . . . . . . . .20Constant Volume Units Only. . . . . . . . . . . . . . . . . . . . . . . .20Variable Air Volume Units Only . . . . . . . . . . . . . . . . . . . . .22Demand Controlled Ventilation . . . . . . . . . . . . . . . . . . . . .23GUIDE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 24-30

INTRODUCTIONThis book describes the Universal Controller Open XP (UC

Open XP) and the control and sensor options available for the39M air handlers. It details the features, benefits, selection pro-cedures and provides specific guidelines to ensure an effectivesystem design for the Aero® 39M air-handling units (AHU).

Carrier’s Aero 39M central station air handlers provideheating, cooling and ventilation in constant volume (CV) andvariable air volume (VAV) applications. The UC Open XP pro-vides easy-to-set, centralized management of all air-handlingcomponents. The UC Open XP is available for all 39M units.

Aero 39M units can operate stand-alone or interface withBACnet*. If a control is installed as part of a network, it is con-nected to the BACnet communication bus with a field-installedcable (communication link).

All factory-installed sensors, actuators and wiring are inter-nal to the unit. As shown in Fig. 1 and 2, the UC Open XP pres-ents an uncluttered outer surface with no factory-installed wiresor controls extending outside the unit.

BenefitsRELIABLE — Inherent safeties and diagnostics within thecontrol software properly protect equipment and quickly alertthe operator to operation problems or potential problems. FLEXIBLE — Various options meet a variety of applicationrequirements such as variable or constant volume, energyrecovery, smoke control, and timed override. The UC Open XPis designed to function on a network with other system ele-ments to optimize and coordinate the operation of the mechani-cal equipment.COMPLIANT — When used with demand controlled ventila-tion (DCV), the UC Open XP Control System conforms toASHRAE (American Society of Heating, Refrigerating, andAir Conditioning Engineers) 62 Indoor Air Quality Standards.

BACnet ®

24VAC

Gnd

24VAC, 50-60 Hz

20VA, 0.83A

Use Copper

Conductors Only

UC Open XP(OPN-UCXP)

RnetLocal

Access

Xnet

Remote

Expansion

Gnd

Xnet -

Xnet +

Gnd

Rnet +

Rnet -

+ 12V

Gnd

Rnet +

Rnet -

+ 12V

Sense

BACnet Port

Open EnergyManagement Equipement

Pulse Count Ability

Aux Pwr Out

Fig. 1 — UC Open XP with the UC Open XP IO Expander Module

a39-4347

UC Open XP/UC Open XP IO for 39MN,MW Indoor and Weathertight

Outdoor Air Handlers

* Sponsored by ASHRAE (American Society of Heating, Refrigerat-ing, and Air Conditioning Engineers).

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Product Overview — The UC Open XP is factory-in-stalled in its own control plenum section of Carrier's Aero 39Mair handler. In addition, this programmable direct-digital con-troller (DDC) can be field installed in a variety of other heating,ventilating, and air-conditioning applications.

The user configures the UC Open XP to contain a databaseof algorithms, points, schedules, alarms, and system functionsthat are necessary to control and monitor the air-handling unit.The controller data can be configured using many interface de-vices including the following:• i-Vu Application Builder software• SNAP graphical programming

In addition to factory-wired control devices, an optional input/output module can be easily added to the enclosure, giving theUC Open XP the capability to control and/or monitor a total ofup to 48 points.

The UC Open XP provides auxiliary building control to in-terface with other equipment including chillers, hot water sys-tems, lighting and other HVAC equipment.

Applications — The UC Open XP supports a wide rangeof building control applications, including:• Air handlers (CV and VAV), heating, cooling and venti-

lating control.• Mechanical room equipment control, including cooling

towers, pumps (lead/lag), boilers, unit heaters and heatexchangers.

• Scheduling• Custom programming• Practically any other control process needed in commer-

cial buildings.Facility management applications include:• Night Time Free Cooling (NTFC)• Adaptive Optimal Start/Stop• Power fail restart

The control box provides a centralized location for the UCOpen XP control module, which can store hundreds of config-uration settings and set points. The UC Open XP module alsoperforms self-diagnostic tests at start-up, monitors unit opera-tion, and provides alarms.

Physical Characteristics — The UC Open XP withenclosure consists of the controller assembly mounted in an en-closure compliant with National Electrical Manufacturers As-sociation (NEMA) type-1 standards. The controller will run offof the AHU systems power with transformers to adjust the in-coming voltage to 24 vac ± 10%. The incoming power supplymay be 50 or 60 Hz and capable of providing a minimum of 3amps (but not greater than 20 amps) to the control board.

All factory-installed electronic control devices are terminat-ed inside the control box, which is mounted in a control ple-num. See Fig. 2.

The control box enclosure includes the UC Open XP, circuitbreaker, transformers, and terminal blocks. A field-suppliedon/off switch allows power shut off to the control box. Thecontrol box environmental limitations are as follows:

All electrical components are UL (Underwriters’ Laborato-ries) listed. The control assembly is listed and labeled by ETL tocomply with UL standard 873 for temperature indicating andregulating equipment. Complete air-handling units with factory-installed controls are listed and labeled by ETL to comply withUL Standard 1995 for heating and cooling equipment, andcomply with NFPA (National Fire Protection Association)Standard 90A.

All ETL listings are for all factory-supplied controlsoptions. Use of other accessory components are not coveredunder these ETL listings.

Service Area Requirements — Article 110-16 of theNEC (National Electrical Code) describes electrical installa-tion. All UC Open XP installations must comply with the min-imum clearances required for electrical installation as listed inTable 110-16(a) of the code. Make sure to provide the neces-sary clearance from the UC Open XP and unit to any adjoiningwall. Refer to the 39M Application Data catalog for detailed di-mensions for each air-handling component section.

CONTROL BOX CONDITIONS

TEMPERATURE RANGE F (C)

HUMIDITY RANGE (%) (NON-CONDENSING)

Shipping –24-140 (–30-60) 0-90

Operating 0-140(–18-60) 0-90

Storage –24-140(–30-60) 0-90

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CONTROL SYSTEMThe UC Open XP control system consists of the UC Open

XP control module, the UC Open XP I/O expander, sensorsand other controlled devices.

Control Module — The UC Open XP control modulewhen factory installed is mounted in its own dedicated controlplenum. Inside the module is a control board, which contains amicroprocessor that controls the operation of the unit. The con-trols software is not factory loaded onto the UC Open XP northe UC Open XP IO expander as this software is selected andloaded in the field via a software development platform (e.g.,Application Builder or SNAP). Dependent upon the controlsselected, the control module will continuously monitor inputsand will control outputs such as the supply fan, cooling andheating coil valves, electric heat, DX (direct expansion) cool-ing, and air quality sensor.

The UC Open XP I/O expander module mounts directly tothe front of the UC Open XP and comes installed this way for

all 39M models. A connection terminal to daisy-chain themodule to additional modules within the BACnet or otherbuilding management systems on the front of the UC Open XPcontrol module. Refer to Fig. 3.

The UC Open XP module monitors multiple inputs fromsensors and other devices within the system, and sends multi-ple output signals. Device inputs and outputs are wired to theUC Open XP and UC Open XP I/O expander via multiple ter-minals. Refer to Fig. 4 and 5 and Table 1 for detailed wiringinformation.

The UC Open XP communicates using BACnet on an MS/TP network segment communications at 9600 bps. 19.2 kbps,38.4 kbps, or 76.8 kbps.

Wire the controllers on an MS/TP network segment in a dai-sy-chain configuration.

Install a BT485 terminator on the first and last controller ona network segment to add bias and prevent signal distortionsdue to echoing.

Fig. 2 — UC Open XP Factory-Wired Controller

a39-4348

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Fig. 3 — UC Open XP Control Additional Module ConnectionNOTE: See the MS/TP Networking and Wiring Installation Guide for more details.

a48-8581

HEATING

COIL VALVE*

ELECTRIC

HEATER

SUPPLY FAN STATUS

FACE & BYPASS

DAMPER

ACTUATOR

EXHAUST

AIR DAMPER

ACTUATOR

RETURN

AIR DAMPER

ACTUATOR

PRE-HEAT

VALVE*

LOW TEMPERATURE

THERMOSTAT

(FREEZSTAT)

MIXED AIR DAMPER/

OUTDOOR AIR DAMPER

ACTUATOR

COOLING COIL

VALVE*

Fig. 4 — Sensor Wiring Schematic

a39-4349

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Fig. 5 — Controller Wiring Schematic

a39-4350

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Table 1 — UC Open XP W/UC Open XP IO Applications

DEVICE(CHANNEL NO.)

CABLE NO.

WIRE COLOR TERMINAL SIGNAL

FILTER STATUS SWITCH (CHANNEL # UI-1) WHITE TB2-1 DRY CONTACT D1CABLE #3 BLACK TB2-2 SIGNAL GROUND

SUPPLY AIR TEMEPRATURE (CHANNEL # UI-2) WHITE TB2-10 10K THERMISTOR A1CABLE #1 BLACK TB2-12 SIGNAL GROUND

MIXED AIR TEMPERATURE (CHANNEL # U1-3) WHITE TB2-7 10K THERMISTOR A1CABLE #4 BLACK TB2-8 SIGNAL GROUND

OUTDOOR AIR DAMPER (CHANNEL # UI-4) FIELD INST. U1-4 J4-7 10 K THERMISTOR A1(FIELD SUPPLIED / INSTALLED) FIELD INST. GND J4-10 SIGNAL GROUND

LOW TEMPERATURE THERMOSTAT (FREEZSTAT) (CHANNEL # UI-5) WHITE TB2-4 DRY CONTACT D1CABLE #2 BLACK TB2-3 SIGNAL GROUND

SUPPLY FAN STATUS (CHANNEL # UI-6) FIELD INST. U1-6 J4-10 DRY CONTACT D1CABLE #2 FIELD INST. UIGND J4-11 SIGNAL GROUND

RETURN AIR TEMPERATURE (CHANNEL # UI-7)

FIELD INST. UI-6 J4-10 10 THERMISTOR A1FIELD INST. GND J4-11 SIGNAL GROUND

SPACE RETURN FAN (CHANNEL # UI-8)FIELD INST. UI-8 J4-13 4-20 MA (+)FIELD INST. PWR OUT J4-1 +24 VDC POWERFIELD INST. GND J4-14 SIGNAL GROUND

SPACE INDOOR AIR QUALITY (CHANNEL # UI-10)FIELD INST. UI-10 J4-15 4-20 MA (+)FIELD INST. PWR OUT J4-1 +24 VDC POWERFIELD INST. GND J4-17 SIGNAL GROUND

OUTDOOR AIR QUALITY (CHANNEL # UI-11)FIELD INST. UI-11 J4-18 4-20 MA (+)FIELD INST. PWR OUT J4-1 +24 VDC POWERFIELD INST. GND J4-20 SIGNAL GROUND

RETURN FAN (CHANNEL # UI-12) FIELD INST. UI-12 J4-19 4-20 MA (+)FIELD INST. PWR OUT J4-1 +28 VDC POWER

(FIELD SUPPLIED / INSTALLED) FIELD INST. GND J4-20 SIGNAL GROUNDRETURN EXHAUST FAN STATUS (CHANNEL # EXIN-1) FIELD INST. EXIN-1 J3-1 DRY CONTACT D1

CABLE #19 FIELD INST. EXGND J3-2 SIGNAL GROUNDHIGH SUPPLY DUCT RH FIELD INST. EXIN-2 J3-3 DRY CONTACT D1

(CHANNEL # EXIN-2) FIELD INST. EXGND J3-4 SIGNAL GROUNDFIRE/SMOKE SHUTDOWN CONTACT FIELD INST. EXIN-3 J3-5 DRY CONTACT D1

(CHANNEL # EXIN-3) FIELD INST. EXGND J3-6 SIGNAL GROUNDSMOKE MODE EVACUATION INPUT FIELD INST. EXIN-4 J3-7 DRY CONTACT D1

(CHANNEL # EXIN-4) FIELD INST. EXGND J3-8 SIGNAL GROUNDSMOKE MODE PRESSURIZATION INPUT FIELD INST. EXIN-5 J3-9 DRY CONTACT D1

(CHANNEL # EXIN-5) FIELD INST. EXGND J3-10 SIGNAL GROUNDSMOKE MODE PURGE INPUT FIELD INST. EXIN-6 J3-11 DRY CONTACT D1

(CHANNEL # EXIN-6) FIELD INST. EXGND J3-12 SIGNAL GROUNDENTHALPY SWITCH FIELD INST. EXIN-7 J3-13 DRY CONTACT D1(CHANNEL # EXIN-7) FIELD INST. EXGND J3-14 SIGNAL GROUND

PRE-HEAT (CHANNEL # EXUI-9) WHITE TB2-5 10 THERMISTOR A1CABLE #7 BLACK TB2-8 SIGNAL GROUND

HOT DECK TEMPERTURE (CHANNEL # EXUI-9) WHITE TB2-6 10 THERMISTOR A1CABLE #18 BLACK TB2-8 SIGNAL GROUND

FILTER STATUS SWITCH 2 (CHANNEL # EXUI-16) WHITE TB2-11 DRY CONTACT D1CABLE #17 BLACK TB2-12 SIGNAL GROUND

SUPPLY FAN MOTOR START/STOP RED TB3-2 STARTER (HOT)(CHANNEL # DO-1) WHITE TB3-3 HAND

CABLE #10 GREEN TB3-4 STARTER (AUTO)HUMIDIFIER ENABLED RED N/C

WHITE TB6-2 24VAC SIGNAL(CHANNEL# DO-2) BLACK TB6-4 GROUND

CABLE #16 GREEN N/CRETURN FAN/EXHAUST FAN MOTOR START/STOP WHITE TB3-5 STARTER (HOT)

(CHANNEL # DO-3) CABLE #11 GREEN TB3-7 STARTER (AUTO)MIXED AIR DAMPER/OUTDOOR AIR DAMPER RED TB4-1 0-10 VDC AO

WHITE TB4-3 +24 VAC(CHANNEL # AO-1) BLACK TB4-4 POWER GROUND

CABLE #5 GREEN N/CRETURN AIR DAMPER RED TB9-1 0-10 VDC AO

(SMOKE CONTROL) WHITE TB9-3 +24 VAC(CHANNEL # 2) BLACK TB9-4 GROUND

CABLE # 22 GREEN N/CEXHAUST FAN DAMPER RED TB10-1 0-10 VDC AO

WHITE TB10-3 +24 VAC(CHANNEL #2) BLACK TB10-4 GROUND

CABLE #22 GREEN N/CHEATING COIL VALVE RED TB5-1 0-10 VDC AO

WHITE TB5-3 +24 VAC(CHANNEL # AO-2) BLACK TB5-4 GROUND

CABLE #9 GREEN N/CCOOLING COIL VALVE RED TB1-1 0-10 VDC AO

WHITE TB1-3 +24 VAC(CHANNEL # AO-3) BLACK TB1-4 GROUND

CABLE #8 GREEN N/CSUPPLY FAN VARIABLE FREQUENCY DRIVE SPEED RED TB8-1 2-10 VDC AO

(CHANNEL # AO-4) CABLE #10 BLACK TB8-4 GROUNDRETURN FAN/EXHAUST FAN VARIABLE FREQUENCY DRIVE SPEED RED TB8-2 2-10 VDC AO

(CHANNEL #AO-5) CABLE #11 BLACK TB8-4 GROUND

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Table 1 — UC Open XP W/UC Open XP IO Applications (cont)

CONTROL HARDWAREThe UC Open XP control module works in conjunction

with the following equipment by receiving inputs and sendingoutputs to the sensors, switches, dampers and other devices inthe system. Figure 6 shows the air handler with typical sensorsand actuators installed.

All factory-installed sensors will be wired to one of 2 loca-tions based on the controls option selected in AHUBuilder®

program as outlined below:

WiringNO PRODUCT INTEGRATED CONTROLS — No sen-sors are installed nor wired in the AHU.FACTORY WIRED, NO CONTROLLER — All factory-installed sensors are wired to a terminal strip normally locatedin either a control plenum or the supply fan section.FACTORY WIRED, UNPROGRAMMED CONTROLLERIN CONTROL PLENUM — All factory-installed sensors arewired to a terminal strip inside the control plenum. The UCOpen XP controller is then wired to the terminal strip andmounted inside the control plenum.NOTE: If shipping splits exist, wiring will be terminated ateach split with a Molex-type quick connect at each end of thewiring.Sensors — Various factory-installed and field-installedsensors are available to provide varying amounts of controlwithin the air-handling system. Following are the factory avail-able sensors that work in conjunction with the UC Open XPand XP I/O expander.

Table 3 lists the standard and optional factory-installed sen-sors provided with each controls option in AHUBuilderprogram.SUPPLY-AIR TEMPERATURE (SAT) SENSOR (P/N33ZCSENSAT) — The SAT sensor is factory-installed andwired when either of the “Factory Wired” control options isselected in the AHUBuilder program. The sensor is normal-ly located in the discharge of the supply fan unless heatingor cooling coils are located downstream of the fan (blow-thru fans only). In a blow-thru situation, the sensor is locat-ed on the discharge end of the last blow thru coil. The sen-sor consists of a thermistor encased within a stainless steelprobe. See Fig. 7. The sensor's thermistor has a range of–245 to 185 F with a nominal resistance of 10,000 ohms at77 F.NOTE: For all Carrier air-handling units, the temperature ofthe supply air includes both fan and motor heat.RETURN-AIR TEMPERATURE (RAT) SENSOR — Thereturn-air temperature sensor (33ZCSENPAT) is ordered

separately as an accessory for field installation in the return airduct. The sensor consists of a thermistor encased within a stain-less steel probe. See Fig. 7.

The sensor’s thermistor has a temperature range of –40 to245 F with a nominal resistance of 10,000 ohms at 77 F.CO2 SENSOR — The CO2 sensor (Fig. 8) monitors carbondioxide levels and is a field-installed accessory. As CO2 levelsincrease, the controller adjusts the outside-air dampers to in-crease ventilation and improve the indoor-air quality. The sen-sor can be wall mounted or duct mounted, however an Aspira-tor Box (P/N 33ZCASPCO2) is required to house the CO2 sen-sor for duct installation. Sensor part numbers are listed inTable 2.

The CO2 sensor uses a Dual Beam Absorption Infrared™method to detect levels of CO2 present in the air. All CO2 sen-sors are set to the factory default measurement range of 0 to2000 ppm and are adjustable to up to 10,000 ppm. The digitaldisplay will show concentrations in the range of 0 to 10,000ppm with a sensitivity of ± 10 ppm and resolution of ± 1 ppm.Under typical conditions of 60 F to 90 F, the sensor accuracy is±50 ppm or ± 3% of reading in the 0 to 2000 ppm range and±5% of reading in the 2000 to 10,000 ppm range. The sensorwill operate in conditions of 32 F to 122 F and 0 to 95% RH,non-condensing.

Also available are CO2/space temperature sensors thathouse the two sensors in a single unit. These sensors use a Sin-gle Beam Absorption Infrared™ diffusion technology to moni-tor CO2 levels and have a 10,000 thermistor to measure spacetemperature. This sensor has the same measurement range asthe CO2 sensors, with an accuracy of ± 110 ppm in the 0 to2000 ppm range under typical conditions of 60 F to 90 F.

Figure 9 shows ventilation rates for various CO2 set pointswhen outside air with a typical CO2 level of 350 ppm is used todilute the air.

The CO2 sensor has a 4 to 20 mA output that is converted to0 to 5 vdc by a 250 ohm, ¼ watt, 2% tolerance resistor connect-ed across the zone controller's CO2 input terminals.

Table 2 — CO2 Sensor Part Numbers

DEVICE(CHANNEL NO.)

CABLE NO.

WIRE COLOR TERMINAL SIGNAL

EH RED TB5-1 0-10 VDC AOWHITE TB5-3 +24 VAC

(CHANNEL #AO-2) BLACK TB5-4 GROUNDCABLE #12 GREEN N/C

PHV RED TB6-1 0-10 VDC AOWHITE TB6-3 +24 VAC

(CHANNEL # AO-6) BLACK TB6-4 GROUNDCABLE #12 GREEN N/C

FBD RED TB6-1 0-10 VDC AOWHITE TB6-3 +24 VAC

(CHANNEL # AO-6) BLACK TB6-4 GROUNDCABLE #23 GREEN N/C

PART NUMBER DESCRIPTION33ZCSPTCO2LCD-01 CO2 sensor with display33ZCSPTCO2-01 CO2 sensor without display

33ZCT55CO2 Space temperature and CO2 sensor with override

33ZCT56CO2 Space temperature and CO2 sensor with override and set point adjustment

33ZCASPCO2 Aspirator box for duct mount CO2 sensors

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Table 3 — Standard and Optional Factory-Installed Sensors in AHUBuilder® Program

LEGEND

AHUBUILDER CONTROLS

OPTION

UC OPEN XP CONTROLLER INSTALLED?

STANDARD SENSORS INSTALLED (39M) OPTIONAL SENSORS AND CONTROLS (39M)TYPE INSTALLED

WHENLOCATION TYPE AVAILABLE

VIA DROP DOWN MENU IN

LOCATION

No Product Integrated Controls

No None N/A N/A None N/A N/A

Factory Wired - No Controller

No Mixed Air Temperature (MAT)

Mixing Box or Filter Mixing Box is Present

Leaving Air Side of MXB/FMB

Damper Actu-ators (with or without link-age)

All Sections with Dampers

Mounted on Damper Actuating Shaft

Low Tempera-ture Thermo-stat (LTT)

Steam, HW or CW Coil is Present

If HW or Steam Coil Present and Upstream of any CW Coil, LTT Installed on Leav-ing Air Side of Steam or HW coil. Otherwise Installed on Entering Air Side of CW Coil.

Filter Status Switch

All Filter Sec-tions

Sensor Mounted Upstream and Downstream of Fil-ter

Supply Air Temperature Sensor (SAT)

Always Pres-ent

DT AF/FC - Dis-charge of Fan

Humdifier Ter-minal Box for Field Sup-plied Control Valve

Humdifier Section

Mounted on Outside of the Humdifier Section

DT PF - on Fan Leaving Side of Fan Sled

Cooling/Heat-ing Terminal Box for Field Supplied Con-trol Valve

All CW, DX, HW and Steam Sec-tions

Mounted on Outside of the Cooling or Heating Section

BT AF/FC - Dis-charge of Fan When No Downstream Coil or at End of Last Coil in Air-stream

6-stage Elec-tric Heat Sequencer

Electric Heat Section

Mounted Inside Electric Heat Sec-tion

BT PF - discharge of plenum section or end of last BT coil if BT coil present

SCR Control-ler

Electric Heat Section (low kW heaters)

Mounted Inside Electric Heat Sec-tion

Fan Status Switch

Supplied with Each Supply, Return, or Exhaust Fan

In the bottom sec-tion of the VFD or inside of the starter or disconnect. Oth-erwise, factory sup-plied in fan section for field installation.

Vernier Con-troller

Electric Heat Section (high kW heaters)

Mounted Inside Electric Heat Sec-tion

Preheat Tem-perature Sen-sor (PHEAT)

Electric Heat Section is at Least 18 Inches in Length and Upstream of a Cooling Coil

Installed After the Electric Heater in the Electric Heater Section

VFD Fan Section External to Fan Sec-tion or Inside VFD Plenum

Motor Starter with or with-out Discon-nect

Fan Section External to Fan Sec-tion

Factory Wired - Unprogrammed Controller in Control Plenum

Yes Same Offering as “Factory Wired - No Controller” Option

Same Offering as “Factory Wired - No Controller” Option

AF — AirfoilCW — Cooler WaterDX — Direct ExpansionFC — Forward CurveFMB — Filter Mixing BoxHW — Heater WaterLTT — Low Temperature ThermostatMAT — Mixed Air TemperatureMXB — Mixing BoxPHEAT — Preheat Temperature SensorSAT — Supply Air Temperature SensorSCR — Silicon Control RectifierVFD — Variable Frequency Drive

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MIXED AIR TEMP

(MAT) SENSOR

DAMPER ACTUATORS

(EA, RA, OA)ELECTRIC HEATER

CONTROL BOARD

AND SEQUENCER

CONTROLLER MOUNTED

IN OWN PLENUM

OR EXTERNAL TO UNIT

FILTER STATUS

SWITCH (FLTS)

SUPPLY AIR

TEMP (SAT)

SENSORLOW TEMP

THERMOSTAT

(LTT OR FREEZESTAT)

.08 in.(.2 cm)

FOAM GASKET

.4 in. O.D.(1.02 cm O.D.)

.39 in.(.99 cm)

5.5 in. ± .5(14 cm ± 1.27 cm)

114 in. (2.9 m)PLENUM-RATED CABLE

.25 in. ± .01 dia.(.6 cm ± .003 dia.)

.175 in. dia. x .6 in.(.45 cm dia. x 1.52 cm)

3.9 in.(9.9 cm)

3 in.(7.6 cm)

PROBE

Fig. 6 — 39M Typical Actuator and Sensor Installation Locations

a39-4351

Fig. 7— Supply-Air/Return-Air Temperature Sensor (33ZCSENSAT)

a33-9293

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OUTDOOR-AIR TEMPERATURE SENSOR (OAT)(P/N 33ZCSENOAT) — The OAT sensor is ordered separat-edly for field installation and consists of a thermistor encasedwithin a probe. See Fig. 10.

The OAT Sensor has an operating range of –40 F to 245 Fwith a nominal resistance of 10,000 ohms at 77 F and an accu-racy of ± 36 F. SPACE TEMPERATURE (SPT) SENSOR (CV UnitsOnly) — The space temperature sensor has a low profile en-closure in a neutral color and is available in 4 different offer-ings. See Table 4. The SPT Pro (Fig. 11) has a large, easy-to-read LCD and displays space temperature, outside-air tempera-ture, heating set point, cooling set point, time and a local over-ride for after hours occupancy.

The SPT sensor provides a hidden communication port al-lowing a laptop computer or a BACview keypad to commis-sion and maintain the connected equipment easily. MultipleSPT sensors can be daisy-chained to one controller for temper-ature averaging or high/low select control (one SPT Pro+ withup to four SPT Standard sensors). See Table 5.

The SPT sensor contains a precise 10,000 ohm thermistorwith +0.36 F standard accuracy and less than 0.18 F drift over aten-year span. The sensor has a range of 50 F to 95 F.

Table 4 — Space Temperature Sensors

Table 5 — UC Open XP Communications Bus to System Element Color Code System

1.07 in.

(2.71 cm)

SIDE VIEW

4.58 in.

(11.64 cm)

3.2 in.

(8.14 cm)

Fig. 8 — Air Quality (CO2) Sensor (Wall Mount Version Shown)

a33-9294

Fig. 9 — Ventilation Air Based on CO2 Set Point

PART NUMBER DESCRIPTIONSPS SPT StandardSPPL SPT PlusSPP SPT ProSPPF SPT Pro+

SIGNALTYPE

CCN BUSCONDUCTORINSULATION

COLOR+12VRnet-Rnet+Gnd

REDBLACKWHITEGREEN

2.81 in.(7.14 cm)

4.56 in.(11.58 cm)

4.92 in.(12.5 cm)

Fig. 10 — Outdoor-Air Temperature (OAT) Sensor

a33-9296

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MIXED-AIR TEMPERATURE (MAT) SENSOR — Themixed-air temperature sensor measures the temperature of theair leaving the mixing box. The MAT sensor is factory sup-plied and installed when either of the "Factory Wired" controloptions is selected in the AHUBuilder® program and a mixingbox or filter mixing box is present. The sensor is located insidethe last mixing box in the airflow.

The MAT sensor consists of multiple thermistors evenlyspaced and encased within a flexible copper tube, whichprovides average temperature sensing. The sensor tubing isinstalled on the downstream side of the mixing box and isserpentined so it can sense average temperature. The MAThas a range of –40 to 185 F with a nominal resistance of10,000 ohms at 77 F.PREHEAT TEMPERATURE SENSOR (PHEAT) — Thepreheat temperature sensor measures the temperature of the airleaving the preheat coil. The sensor is factory supplied and in-stalled when there is an extended length electric heating coil inits own section before a cooling coil and either of the "FactoryWired" control options is selected in the AHU Builder pro-gram. The PHEAT sensor is normally on the downstream sideof the heating coil in the heating coil section.

The sensor consists of multiple thermistors evenly spacedand encased within a flexible copper tube, which providesaverage temperature sensing. The sensor tubing is installed onthe downstream side of the preheat coil and is serpentined so itcan sense average temperature. The preheat sensor has a rangeof –40 to 185 F with a nominal resistance of 10,000 ohms at77 F.LOW-TEMPERATURE THERMOSTAT (LTT) (Fig.12) — The low-temperature thermostat (often referred to as afreezestat) protects the chilled water from freezing when ab-normally cold air passes through the coil. The sensor is factorysupplied and installed when there is a factory supplied and in-stalled steam or water heating and/or cooling coil and either ofthe "Factory Wired" control options is selected in the AHU

Builder program. The LTT is a factory-installed 20-ft long cap-illary tube mounted in the airstream on the entering side of thechilled water coil or the leaving air side of the first hot watercoil if no cooling is supplied in the equipment. The thermostatreset mechanism is provided inside the control box.

The low-temperature thermostat has a range of 35 to 60 Fand is factory-set to switch at 35 F. It can be field-adjusted tomeet the specific job requirements.

The thermostat is wired to the control box. If any one-footsection of the capillary senses air cooler than the thermostat setpoint, it causes the fan to shut down and an alarm is generated.A manual reset inside the control box can restart the fan afterthe problem is corrected and the coil temperature has risen byat least 5 F. The location of the reset eliminates the need toopen the air handler.

RELATIVE HUMIDITY SENSORS — The relative humidi-ty sensor can either be wall mounted (Fig. 13), duct mounted oroutdoor mounted. Relative humidity sensors can be used fordehumidification control, for monitoring the relative humidityin the occupied space or for monitoring the relative humidity inthe outdoor air. These sensors use bulk polymer resistancetechnology, which eliminates the effect of surface contamina-tion and helps maintain the sensor accuracy over a long periodof time.

The wall-mounted relative humidity sensor is normally in-stalled on an interior wall where the relative humidity is repre-sentative of the entire zone to be serviced. The duct mountedrelative humidity sensor is normally mounted in the zone's re-turn air duct, and the outdoor relative humidity sensor is nor-mally mounted where the sensor is protected from the elementsand direct sunlight, such as under an eave.

The relative humidity sensors have a range of 0 to 99%RH< non-condensing and operate at temperatures from 40 F to130 F. Their accuracy at 77 F is ± 2% RH from 10 to 80% and± 3% RH from 80-99%. The wall-mounted sensor has an out-put of 4 to 20mA, the duct-mounted sensor has a 0 to 5 vdc out-put and the outside sensor has a 0 to 10 vdc output. Part num-bers for each are shown in the following table.

MANUAL ON

INFO

WARMER

COOLER

Fig. 11 — SPT Pro Sensor

a33-9193C F

Fig. 12 — Low-Temperature Thermostat

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SwitchesFAN STATUS SWITCH — The fan status switch monitorsany change in AC current that is indicative of a motor failure,belt loss or slippage or mechanical failure of the fan. The fanstatus switch is factory supplied with each supply, return andexhaust fan when either of the "Factory Wired" control optionsare selected. The switch is factory-installed and wired when aVFD, starter or disconnect is factory-installed and sufficientroom exists. Otherwise, the switch is factory supplied for fieldinstallation.

The fan status switch includes two status LED indicatorsthat will indicate one of three states: tripped on, current presentbut below trip point, and current off or below the low end of theadjustable trip point range.

The fan status switch has an amperage rating of 0.32 to 150amps continuous and a maximum sensing current voltage of600 vac.DIFFERENTIAL ENTHALPY CONTROL — The enthal-py switch/receiver (P/N 33CSENTHSW) and the enthalpy sen-sor (P/N 33CSENTSEN) are available for differential enthalpycontrol (Fig. 14). The enthalpy switch/receiver, mounted in theoutdoor air intake, calculates the outdoor air enthalpy. The en-thalpy sensor, mounted in the return airstream, calculates theindoor air enthalpy. The enthalpy switch/receiver energizes theHI enthalpy relay output when the outdoor enthalpy is greaterthan the indoor enthalpy, and the LOW enthalpy terminal whenthe outdoor enthalpy is lower than the indoor enthalpy.

The switch and sensor have an operating range of –40 to140 F and a 0 to 100% (non condensing) operating relative hu-midity. The switch/receiver has a sourced 24 vac through 10amp form 1C relay output, and the sensor has a 2-wire, 4 to20 mA loop powered output. Both are accurate to ± 1 Btu/lb at77 F.FILTER STATUS SWITCH (P/N 33AMSENFLT000) —The filter status switch is factory-installed in a filter or filtermixing box section if ordered via a drop down menu in theAHUBuilder® program when either of the "Factory Wired"control options is selected. The FLTS is a snap-acting SPDTswitch. When dirty filter elements cause the pressure dropacross the filter media to exceed the switch setting, the switch

closes and causes an alarm signal to be generated at the controlbox.

The FLTS has an operating range of 0.05 to 2.0 in. wg andcan be adjusted for field-installed filter elements. The switch isfactory set to trip at 0.5 in. wg. See the following for recom-mended settings for all filter types:

RelaysMODULATING MIXED-AIR DAMPER ACTUA-TORS — The mixed-air damper actuators are factory sup-plied and installed when ordered via a drop down menu in theAHUBuilder program. When installed, the actuators are doneso directly on the damper jackshaft. If more than one damperis located inside of the mixing box, either separate actuators oneach damper or one actuator with damper linkage can be or-dered.

The actuators consist of an electronically controlled revers-ible motor equipped with a microprocessor drive. This driveprovides constant speed regardless of load, which maintainsproper position for all dampers.

All actuators are capable of holding their position at anypoint in the stroke and moving the dampers in either direction.

PART NUMBER SENSOR DESCRIPTION33ZCSENSRH-02 Space (wall mounted) Relative

Humidity Sensor33ZCSENDRH-02 Duct Relative Humidity Sensor33ZCSENORH-02 Outdoor Relative Humidity Sensor

5.25 in.

(13.3 cm)

3.25 in.

(8.3 cm)

Fig. 13 — Wall-Mounted Relative Humidity Sensor(33ZCSENSRH-02)

a33-9295

FILTER TYPE(Efficiency)

RECOMMENDED MAXIMUMPRESSURE SETTING

(in. wg)2-in. Flat (< 35%) 0.52 to 4-in. Flat (35-65%) 1.0Bag/Cartridge (65-85%) 1.2Final (85-98%) 1.5

Fig. 14 — Differential Enthalpy Control, Sensor,and Mounting Plate (33AMKITENT000)

ENTHALPY SWITCH / RECEIVER

ENTHALPY SWITCH

A A

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All actuators have a spring return feature that automaticallycloses the damper to outside air whenever there is a loss ofpower. Spring return means reliable fail-safe operation andpositive close-off on airtight dampers.

The actuators provide 95 degrees of rotation and include agraduated position indicator showing –5 to 90 degrees. Theactuator has a unique manual positioning mechanism thatallows the setting of any damper position within its rotation.

Actuators are shipped in the zero position (5 degrees fromfully closed) to provide automatic compression against dampergaskets for tight shutoff. When power is applied, the manualmechanism is released and the actuator drives toward the fullyclosed position. The actuator will memorize the angle where itstops rotating and use this point for its zero position during nor-mal control operations. The manual override can also be releasedphysically by using the crank supplied with the actuator.

The actuators are 24 V with a 2 to 10 VDC output signal anda 4 to 20 mA control signal.

FACE AND BYPASS DAMPERS ACTUATORS — Faceand bypass damper actuators are factory supplied and in-stalled when ordered via a dropdown menu in the AHUBuilder® program. These actuators are of the same makeand type as the mixed-air damper actuators.

Electric Heat Control — Electric heaters can be con-trolled via an electric heat sequencer, SCR controller or Verniercontroller as described below.ELECTRIC HEAT SEQUENCER — The UCS-621E is asolid-state device used for multi-stage electric heater con-trol. This transducer can be factory supplied and wired ifordered via the AHUBuilder program and will be installedinside the electric heat control compartment. The UCS-621E provides six stages of relay control with adjustable re-lay setpoints and differentials, requires 24 VAC/VDC pow-er and provides a LED indication of relay status. The elec-tric heat transducer accepts a 0 to 20 mA or 0 to 15 vdc in-put singal and has an operating temperature range of 32 to158 F with a humidity limit of 5% to 95% relative, non-con-densing. SCR CONTROLLER — The silicon controlled rectifier isavailable via a drop down in AHUBuilder for low kW elec-tric heaters on un-sheathed wire elements only. The SCRcontroller is a solid state device that provides 0 to 100%power control. With no moving parts, the SCR controller isboth stepless and noiseless and provides a much longer op-erational life for an electric heater.

The SCR controller is a semiconductor rectifier that canconduct and block current flow in the forward direction de-pending on the control or "gate" signal given while alsoblocking current flow in the reverse direction (operating asa diode). See Fig. 15. The SCR has 2 states, ON and OFF.During the ON stage, a control signal is applied between the

gate and cathode and allows the current to flow through theSCR to the heater (the SCR is now a conductor). During theOFF stage, the control signal is removed and since no volt-age is applied across the gate and cathode, no current willflow through the SCR to the heater (SCR is now an insula-tor).

Since the SCR as described above allows current to flowin only one direction, it will only allow half of the AC cur-rent waveform to be conducted. As a result, a second SCRis used and is connected in parallel but in the opposite direc-tion to the first SCR. This configuration, known as the"back-to-back" configuration, conducts both halves of theAC waveform delivering maximum power. See Fig. 16.

The SCR utilizes time proportioning control to produce anear infinite power control resolution. In time proportion-ing control, the SCR will provide a pulse proportioned overa 1-second period to achieve the desired percentage of heat-er control or ON time. For example, if the heater is to oper-ate at 50% load, then the SCR controller will be ON for 500milliseconds transferring current to the heater and OFF forthe following 500 milliseconds where no current is trans-ferred, and the process then repeats (please see Fig. 17). Ifthe heater were to operate at full load, then the SCR will beON and provide current for the entire 1-second period andthen repeat (continuous power). See Fig. 17.

GATE

ANODE

CATHODE

CURRENT FLOW

a39-4376

Fig. 15 — SCR Diagram

SCR IN AC CIRCUIT

AC POWERELECTRIC HEATER

A39-4377

Fig. 16 — SCR Back-to-Back Configuration

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The SCR controller is designed to receive a 0 to 10 vdc,4 to 20 mA or 0 to 135 ohm control signal. The controlleroperates between 32 and 176 F from 0% to 95% relative hu-midity, non-condensing. The SCR provides an auto shut-off feature when the SCR ambient temperature is above180 F and requires a 24 vac (+10%, –15%) power supply.VERNIER CONTROLLER — The Vernier controller isavailable via a drop down in AHUBuilder® program forhigh kW electric heaters on un-sheathed wire elements only.The Vernier controller is a combination of a standard multi-stage controller and an SCR controller and provides 0 to100% power control for an electric heater. The Verniercontroller is an economical means of power control at highkW loads as it modulates the SCR portion of the controllerbetween each operating stage of the standard stage control-ler. For example, when the electric heater requires powerbetween the set points of any 2 stages, the lower stage is en-ergized and then the SCR controller is energized to providethe precise level of power required.

The Vernier controller is designed to receive a 0 to 10vdc, 4 to 20 mA or 0 to 135 ohm control signal. The con-troller operates between 32 and 176 F from 0% to 95% rela-tive humidity, non-condensing. The SCR provides an autoshut-off feature when the SCR ambient temperature isabove 180 F and requires a 24 vac (+10%, –15%) powersupply.

VALVE SELECTIONSelect a valve where the pressure drop is equal to 50% of

the total system pressure drop or 5 psig, whichever is greater.The examples below use this method. An alternate selectionprocedure is described at the end of this section.

Two-Way Hot Water or Chilled WaterValves — Figures 18 and 19 illustrate typical piping for a 2-way valve. To select the correct valve, follow the procedureoutlined in the selection example below:

1. Determine coil requirements.Given:Coil Pressure Drop . . . . . . . . . . . . . . . . . . . . . . . . 30 ft wgChilled Water Flow. . . . . . . . . . . . . . . . . . . . . . . . .40 gpm

2. Select a normally closed valve.Enter Fig. 20. At 30 ft wg coil pressure drop and40 gpm water flow, find that the correct valve selectionis ‘J.’ NOTE: If the selection point falls exactly on thesolid line, select the valve to the left of the line.From Fig. 20 read that the valve pressure drop is13 psig and the total pressure drop of the valve andcoil is 26 psig. Table 5 shows the ‘J’ valve to have aflow coefficient of 11.

Three-Way Mixing Valves — Three-way mixingvalves are available for both hot water and chilled water applica-tions. See Fig. 21 and 22 for typical piping arrangements andvalve selection. To select a valve, follow the 2-way valve selec-tion procedure but use the graph for 3-way mixing valve selec-tion (Fig. 23).

SCR ON

FOR 0.5 SECONDS

SCR OFF

FOR 0.5 SECONDS

SCR ON

FOR 0.5 SECONDS

SCR AT 50% LOAD

SCR ON

FOR 1.0 SECONDS

SCR ON

FOR 1.0 SECONDS

SCR AT 100% LOAD

Fig. 17 — SCR Current Draw at 50% and 100% Loading

a39-4378 a39-4379

Fig. 18 — Two-Way Valve Pressure Drop

Fig. 19 — Two-Way Valve Typical Piping

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NOTE: See Table 5 for description of valve flow coefficients (Cv) (D-P).

Fig. 20 — Two-Way Valve Selection

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Two-Way Steam Valves — See Fig. 21 for typicalpiping installation. To select a valve, follow the procedureoutlined in the selection example below:

1. Determine system coil requirements.Given:Inlet Valve Pressure. . . . . . . . . . . . . . . . . . . . . . . . 9.0 psigSteam Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 lb/hr

2. Select Valve.Enter Fig. 22 at 9.0 psig inlet valve pressure and30 lb/hr steam flow and find that the correct valveselection is ‘C.’From Fig. 22 read that the inlet pressure to the coil is1.9 psig. Table 6 shows the selected valve assemblyhas a normally open valve flow coefficient of 1.3.

Table 6 — Valve Specifications

NOTE: Flow coefficient (Cv) is the quantity of water, in gallons per minute at60 F, that will flow through a given valve with a pressure drop of 1 psig.Water limits: 40 to 150 F fluid temperature = 400 psig

151 to 289 F fluid temperature = 250 psig

NOTES:1. Steam valve modulates the flow of steam through the coil

based on the signal generated by the control.2. The pressure leaving the steam trap (system return pressure)

is assumed to be zero.

Fig. 21 — Steam Valve Typical Piping

VALVETYPE

VALVE CODE(Valve Selection)

FLOWCOEFFICIENT

(Cv) (Note)

2-Way

NormallyClosed

B 0.4C 1.3D 2.2E 3.6F 5.0G 6.2H 8.2J 11.0K 16.0L 25.0M 40.0N 65.0P 85.0

2-Way

NormallyOpen

B 0.4C 1.3D 2.2E 3.6F 5.0G 6.2H 8.2J 11.0K 16.0L 26.0M 40.0N 65.0P 85.0

3-WayHot or Cold

Water

(Mixing)

Q 2.0R 4.0S 6.8T 12.0U 16.0V 33.0W 55.0X 67.0Y 91.0

NOTE: See Table 6 for description of valve flow coefficients (Cv) (B-P).

Fig. 22 — Two-Way Steam Valve Selection

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Alternate Valve Selection Procedure — The fol-lowing procedure may also be used to select a valve. With thismethod the valve is selected to meet a specific pressure drop.

1. Determine valve requirements.Given:Valve Pressure Drop . . . . . . . . . . . . . . . . . . . . . . . . . 4 psigChilled Water Flow. . . . . . . . . . . . . . . . . . . . . . . . . 60 gpm

2. Select a 2-way normally open valve.Using the following formula, calculate the flow coeffi-cient (Cv) based on the required flow and pressure drop.

Using the Carrier Belimo Valve Catalog (811-10112),find the valve assembly Cv that most closely matches butis NOT less than the calculated Cv. For this example, aB225B valve is recommended.

When selecting valves, refer to the equations and guidelines below in addition to the examples given.Water Application

Alternate Forms:

Using Metric Measurements, the equation is:

GuidelinesTwo-Way Valve, Water ApplicationTwo-position applications: Valve should be line size.Proportional applications:

NOTE: Valve and actuator must meet conditions of service.Always verify:

— Maximum pressure of body— Close off pressure rating— Ambient temperature limits are within valve/actuator

limits— Actuator control circuit matches analog or digital output

Three-Way Valve, Water ApplicationTwo-position applications: Valve should be line size.Proportional applications:

Two-Way Valve, Steam ApplicationTwo-position applications: Valve could be line size, Use h,pressure drop, equal to 10% of inlet pressure.Proportional applications:

Where:Cv = Valve coefficient of flowQ = Pounds per hour of steam = #/hrh = Pressure drop across open valvePo = Outlet pressure in Psia = P1-hP1 = Absolute Inlet Pressure = Gauge Pressure (PSIG) + 14.7

Valve Ordering Information and SpecificationsMODEL NUMBER NOMENCLATURE — Use Fig. 23 as areference for valve ordering. For complete valve options anddetails, refer to the Carrier Belimo Catalog (number 811-10112).

Cv =flow in gpm

valve pressure drop

Cv =60

4

Cv = 30

Equations: Cv =QG

P

Where Q = Flow in gallons per minute (GPM)required to pass through the valve

G = Specific Gravity of FluidP =Pressure drop across the valve in PSICv = Flow Coefficient

Q =CvP

P = ( (QG) )2

G Cv

Kvs =Cv

Kvs =V100

PV100

100

Kvs = Flow Coefficient in m3/h

V100 = Flow in m3/h

PV100 = Pressure differential in kPa

PV100 = Pressure differential in bar100

Flow Characteristic: Equal PercentageSizing: P should match P of coil

or 3 to 5 psi dropor use ASHRAEauthority method

Flow Characteristic: LinearConstant flow: Valve should be line size or

P equal to coil dropVariable flow: Size valve for 3 to 5 psi pressure

drop or use ASHRAE authoritymethod

Cooling tower bypass: Size valve according to required pressure drop and flow requirement

System bypass: Size valve according to required pressure drop and flow requirement

Flow Characteristic: Equal PercentageLow pressure <15 psi: Use h = 80% P1 where P1

is inlet pressureMedium/high pressure <15 psi and <100 psi:

Use h = 42% P1 (in psia) where psia = psig + 14.7

Cv =Q

3h x Po

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BP (Carrier prefix) + valve type + actuator + custom set-up if required.BP + B209 + BP-ACT- LF24-SR + G = ODS P/N BPB209LF24SRG

VA LV E + C A R R I E R AC T UATO R

BP B2 09 + BP-ACT- LF 24 - SR

24 VAC/DCPower

Carrierdesignator

No

n-S

pri

ng

Ret

urn

Act

uat

or

Sp

rin

gR

etu

rn A

ctu

ato

r

LR… LessNM… TorqueAM…GM…

LessNV… Force

LF… LessNF… TorqueAF…

NVF… LessForce

DESIGNATOR DESCRIPTION

–SR 2-10 VDC

–3 Floating point

On/Off

Rot

ary

Line

arR

otar

yLi

near

VALVE SIZES

TYPE OF VALVE

Fig. 23 — Valve Model Nomenclature

Custom valve tagging is available forCarrier valve assemblies. Tag is limit-ed to 30 characters. (eg AHU-1 orFCU-2)

DEFAULTS NON-SPRING RETURN

On/Off, NC (Normally Closed)Floating Closed A to AB, will open with power to pin 2

Proportional NC (Normally Closed)Closed A to AB, will open as voltage increases

DEFAULTS SPRING RETURN

On/Off NO/FO (Normally Open / Fail Open)Valve: Open A to AB, will drive closedSpring action: Will spring open A to ABupon power loss

Floating, NC/FO (Normally Closed / Fail Open)Proportional Valve: Closed A to AB, will drive open

Spring action: Will spring open A to ABupon power loss

… + SET UP

(Blank) For all default set ups (see default set ups below)

+ A,B,C,D,E or F F7… 3-way flanged butterfly valve configurations.

+G Normally closed/fail closed - B2/B2…B/B3…B CCVs,G6/G7…flanged globe valves & F6 2-way butterfly valves.

+ S E T U P TAG G I N G

+ G Order Separate -ODS part number BP-TAG

(for special set-up only -leave blank for default setups)

See Carrier Damper Actuator andValve Assembly Program details forhow to process valve tag informationwith ODS order.

Valve Designation SizesCharacterized Control™Valve (CCV)

09 – 50 = 1/2 – 2

Globe Valve 12 – 50 = 1/2 – 2Flanged Globe Valve 65 – 150 = 21/2 – 6Bufferfly Valve 50 – 300 = 2 – 12

Characterized Control™ GLOBE VALVEVALVE (CCV) G2... 2-way valveB2... 2-way Stainless G3... 3-way valve-mixing

Steel Ball & Stem G3...D 3-way valve-divertingB2...B 2-way Chrome

Plated Brass Ball & Flanged GLOBE VALVEBrass Stem G6... 2-way valve

B3... 3-way Stainless G7... 3-way valve-mixingSteel Ball & Stem G7...D 3-way valve-diverting

B3...B 3-way ChromePlated Brass Ball Butterfly VALVE& Brass Stem F6... 2-way valve

F7... 3-way valve

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DIRECT EXPANSION (DX) COOLING

General — Direct expansion (DX) cooling applications arenot directly controlled via the UC Open XP. Direct expansioncooling applications are controlled only by the applicable con-densers controller by controlling the staging of the compressors.Most condensers offer a factory-installed digital compressor op-tion composed of one digital scroll compressor and the rest ofthe compressors being the standard type scroll compressors. Be-low is information regarding digital compressor control. For fur-ther information regarding compressor control, the applicablecondenser control guide should be used.

Digital Compressor — The digital compressor has theability to load and unload rapidly, and the load/unload timing canbe varied to achieve unit capacity and closely match the load.The digital scroll option provides better capacity control by digi-tally modulating capacity, effectively increasing the number ofcompression stages. The digital scroll compressor modulates thecapacity output using a digital unloader solenoid (DUS) which isactivated by a signal from the controller to allow the scroll sets torapidly separate (stop compressing) and reengage (resume com-pressing) during operation. The supply air (SAT) and return air(RAT) sensors are the necessary inputs to stage unloading for alldigital compressors, and are used to determine the temperaturedrop across the evaporator coils to determine the optimum ca-pacity of the digital compressor.

The digital scroll compressor operates in two stages, the load-ed state when the solenoid valve is normally closed and the un-loaded state when the solenoid valve is energized. These twostages rapidly alternate between full capacity and zero capacitywhere during the loaded state the compressor operates like astandard scroll and delivers full capacity and mass flow, and dur-ing the unloaded state, the compressor does not flow refrigerant.

The capacity of the system is varied by varying the time thecompressor operates in an unloaded and loaded state during a set

period of time, normally 15 seconds. For example, if the DUS isenergized for 7.5 seconds, the compressor will be operating at50% capacity. If the DUS is energized for 11 seconds, the com-pressor will be operating at approximately 25% of its capacity.Capacity is the time averaged summation of loaded and unload-ed states, and its range is nearly continuous from 10% to 100%.

The digital compressor is always installed in the first on, lastoff compressor position. For example, when installed in a38APD condensing unit, the digital compressor is always in-stalled in the A1 position, and the resulting sequence of com-pressor operation can be seen in Table 7. The remaining com-pressors are normally standard scroll compressors and are con-trolled via compressor staging (on/off depending on neededcapacity). VARIABLE AIR VOLUME (VAV) SYSTEMS WITH DXCOOLING — VAV systems with DX cooling modulate thecondenser compressors based on maintaining the supply air tem-perature set point. Supply-air temperature (SAT) and return-airtemperature (RAT) sensor inputs are needed for controlling theoperation of the compressors. These inputs can be obtained bythe condenser's controller either directly from the SAT and RAT,or indirectly from the UC Open XP and the UPC Open BACnetcommunication option on the 38APD condensing unit..

When designing a VAV system, it is recommended to useonly row-split DX coils. This prevents the possibilities of freez-ing the condensate to the coil during part load operation at lowloads.CONSTANT VOLUME (CV) SYSTEMS WITH DXCOOLING — Constant volume systems with DX coolingmodulate the condenser compressors based on maintaining thespace temperature set point as can be determined from spacetemperature thermostats. The inputs from the space temperaturethermostats can be obtained by the condenser controller eitherdirectly or via the UPC Open BACnet communication option onthe 38APD condensing unit.

Table 7 — Part Load Data Percent

NOTES:1. These capacity steps may vary due to different capacity staging

sequences.

2. When unit is equipped with digital scroll option, sequence A is alwaysused.

38AP UNIT SIZE CONTROLSTEPS

LOADING SEQUENCE A LOADING SEQUENCE B% Displacement Compressor % Displacement Compressor

38APS025-030 1 50 A1 — —2 100 A1,A2 — —

38APD025-030 1 50 A1 50 B12 100 A1, B1 100 A1,B1

38APS040,0501 33 A1 — —2 67 A1,A2 — —3 100 A1,A2,A3 — —

38APD0401 27 A1 23 B12 50 A1,B1 50 A1,B13 77 A1,A2,B1 73 A1,B1,B24 100 A1,A2,B1,B2 100 A1,A2,B1,B2

38APD050,0601 23 A1 27 B12 50 A1,B1 50 A1,B13 73 A1,A2,B1 77 A1,B1,B24 100 A1,A2,B1,B2 100 A1,A2,B1,B2

38APD070

1 15 A1 15 B12 42 A1,B1 42 A1,B13 57 A1,A2,B1 57 A1,B1,B24 85 A1,A2,B1,B2 85 A1,A2,B1,B25 100 A1,A2,B1,B2,B3 100 A1,A2,B1,B2,B3

38APD080

1 20 A1 20 B12 40 A1,B1 40 A1,B13 60 A1,A2,B1 60 A1,B1,B24 80 A1,A2,B1,B2 80 A1,A2,B1,B25 100 A1,A2,B1,B2,B3 100 A1,A2,B1,B2,B3

38APD090

1 15 A1 18 B12 32 A1,B1 32 A1,B13 48 A1,A2,B1 51 A1,B1,B24 66 A1,A2,B1,B2 66 A1,A2,B1,B25 82 A1,A2,A3,B1,B2,B3 85 A1,A2,B1,B2,B36 100 A1,A2,A3,B1,B2,B3 100 A1,A2,A3,B1,B2,B3

38APD100

1 17 A1 17 B12 33 A1,B1 33 A1,B13 50 A1,A2,B1 50 A1,B1,B24 67 A1,A2,B1,B2 67 A1,A2,B1,B25 83 A1,A2,A3,B1,B2 83 A1,A2,B1,B2,B36 100 A1,A2,A3,B1,B2,B3 100 A1,A2,A3,B1,B2,B3

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WIRING GUIDELINES

Component Wiring — Each field-installed control devicewill come with installation instructions, including the appropri-ate wiring guidelines.

System Wiring — Since air-handling systems are normallymade up of multiple component sections, Carrier has designedthe control system wiring using quick connect Molex type con-nectors on wires that run between sections.

There may be multiple devices mounted within the varioussections, which all must connect back to the UC Open XP andXP/IO modules mounted on the supply fan section.

OPERATING SEQUENCES

NOTE: The UC Open XP can be configured utilizing manydifferent software applications. The following outline of theoperating sequence is based on selections from i-Vu® Applica-tion Builder software.

Constant Volume and Variable Air Volume UnitsTWO-POSITION DAMPER CONTROL — Two-positiondamper control opens or closes field-supplied and field-installedtwo-position outdoor-air dampers to provide minimum outdoorair ventilation.

If the supply fan is OFF, the damper is closed. If the supplyfan is ON, the UC Open XP control determines if the unit is inthe Occupied mode. If unit is in the Occupied mode, the damp-ers open and will maintain a minimum adjustable position. Ifunit is in the Unoccupied mode, the dampers remain closed.FILTER STATUS — This control monitors the differentialpressure between the upstream and downstream side of a filter.

When the filter becomes dirty or needs to be replaced, theairflow switches send a discrete signal to the UC Open XP con-trol. This, in turn, generates an alarm locally or at customeruser interface.FAN CONTROL — The supply fan is started or stoppedbased on an occupancy schedule, unit optimal (temperaturecompensated) start, nighttime (unoccupied) free cooling, unoc-cupied heating, unoccupied cooling, timed override, or the re-mote contact input.

The start of an occupied period is determined by either theoccupancy schedule, unit optimal start, or the remote contactinput. If unit optimal start is not used, the supply fan starts atthe occupied time entered in the occupancy schedule or whenthe remote contact input is closed. If unit optimal start is select-ed, the fan starts at the calculated start time (this algorithm willminimize the unoccupied warm-up or cool-down period whilestill achieving comfort conditions by the start of the scheduledoccupied period). The fan stops at the unoccupied time enteredin the occupancy schedule. (Timed override may be used toprovide an occupied period to a user adjustable timeframe.)

During the unoccupied period, whenever the space tempera-ture falls below the unoccupied heating set point or rises abovethe unoccupied cooling set point, the supply fan energizes andruns until the space temperature returns to within the requiredlimits.

The supply fan can also run during the unoccupied periodwhen the unit is in the Nighttime Free Cooling mode to pre-cool the space prior to the occupied period.NIGHTTIME FREE COOLING MODE — Nighttime (un-occupied) free cooling is used to start the supply fan to precoolthe building’s interior using outside air. This delays the need formechanical cooling when the system enters the Occupiedmode.

The system determines if the outside conditions (tempera-ture and enthalpy) are suitable for cooling. If conditions are

suitable and cooling is necessary, the supply fan is energizedand the dampers modulate open. Once the space has beensufficiently cooled, the fan stops.

If the outside air conditions are not suitable, the fan remainsOFF.

The unit must be equipped with mixed-air dampers toprovide nighttime free cooling.

Nighttime free cooling can be provided whenever the unit isin the unoccupied mode, conditions are suitable, and the night-time free cooling feature has been selected. INDOOR-AIR QUALITY (IAQ) — This function maintainsthe correct occupied ventilation rate using CO2 as an indicatorof occupancy level or controls the levels of volatile organiccompounds (VOCs) or other indoor air pollutants by modulat-ing the outside air dampers. Varying quantities of outdoor airare admitted during the Occupied period to maintain the venti-lation rate at a set point which ensures the pollutant level doesnot exceed the configured set point of the air-quality (AQ)sensor.

The sensor can be either duct-mounted in the return-air ductor mounted within the conditioned space. The sensor will beused to continuously monitor the pollutant level during occu-pied periods.

During the unoccupied period, the damper position is notaffected by the IAQ control. During the occupied period, theUC Open XP control reads the AQ sensor input and comparesit to the configured set point. The UC Open XP control thencalculates the minimum damper position to maintain the setpoint. If no other control is attempting to adjust the dampers toa more fully open position than the IAQ control, the damper isadjusted to the position determined by the IAQ control. Other-wise, the damper is positioned by the superseding control rou-tine or at its configured minimum position.UNIT OPTIMAL START — Unit Optimal (temperature com-pensated) Start is used to heat up or cool down the space priorto occupancy so the space temperature will reach the occupiedset point at time of occupancy. The UC Open XP control usesspace temperature and an occupied set point to determine thetime in minutes that the system should be started in advance ofthe occupied time.FIRE/SMOKE SHUTDOWN — Fire/Smoke Shutdown isused to stop the unit supply and return fan whenever a field-supplied and installed fire/smoke sensor connected to the inputis energized. The status of the input is continuously monitoredby the UC Open XP control. If the fan is operating, it is imme-diately stopped by the UC Open XP control upon receiving afire shutdown status. The alarm can be annunciated locally atthe alarm output as well as repeated through the network to aBuilding Supervisor.SMOKE PRESSURIZATION/PURGE — Upon receiving asmoke pressurization status signal, the unit will start the supplyfan, stop the return fan, open the outside air dampers and closethe return and exhaust air dampers. Upon receiving a smokepurge signal, the unit will start both the supply and return fanswhile opening the outdoor and exhaust air dampers and closingthe return air damper.

Constant Volume Units OnlyHEATING COIL CONTROL — The heating coil controladjusts the steam or hot water valve. The valve is modulated toprevent the space temperature from falling below the desiredheating set point.

If the supply fan is OFF, the heating valve is modulated tomaintain a desired minimum duct temperature.

If the fan is ON, the UC Open XP control reads the spacesensor and computes the supply-air temperature required to sat-isfy conditions.

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Once the required supply-air temperature has been calculat-ed, it is compared to the actual supply-air temperature and theheating coil valve modulates to the required position.

For those systems where the heating coil is located down-stream from the cooling coil, if dehumidification is beingprovided by the cooling coil control and Reheat has beenselected, the valve is modulated in order to maintain thesupply-air temperature above a user-configured temperature setpoint.FACE AND BYPASS HEATING COIL CONTROL — Theheating coil control is used to position a set of face and bypassdampers immediately upstream of a steam or hot water heatingcoil. The damper set is modulated to prevent the space temper-ature from falling below the desired heating set point.

If the fan is off, the dampers are positioned to the full bypassposition and the heating control valve is closed. To maintainthe minimum desired duct temperature while the fan is OFF,the heating valve is opened as necessary.

If the fan is on, the UC Open XP control reads the spacetemperature sensor and computes the supply-air temperaturerequired to satisfy the desired set point.

Once the required supply-air temperature has been calculat-ed, it is compared to the actual supply-air temperature and theface and bypass damper set is modulated to the required posi-tion. The heating valve is opened whenever the damper setmoves away from the full bypass position.

For those systems where the heating coil is located down-stream from the cooling coil, if dehumidification is beingprovided by the cooling coil control and Reheat has beenselected, the damper set is modulated in order to maintain thesupply-air temperature above a user-configured leaving airtemperature.CHILLED WATER COIL COOLING CONTROL — Thecooling coil control adjusts the chilled water valve. The valveis modulated to prevent space temperature from exceeding thedesired cooling set point. The valve remains closed if the spacetemperature is below the set point, or the supply fan is OFF orthe economizer (if present) is operational or not fully open.

If the fan is ON, the UC Open XP control reads the humidi-ty sensor (optional) and compares the value to the high humidi-ty limit.

If the humidity is higher than the high humidity limit, thechilled water valve opens.

If the humidity is below the high humidity limit, the UCOpen XP control reads the space temperature sensor and com-putes the supply-air temperature required to satisfy conditions.

Once the required supply-air temperature has been calculat-ed, it is compared to the actual supply-air temperature andthe chilled water valve modulates to the position required tomaintain desired conditions.FACE AND BYPASS COOLING COIL CONTROL — Thecooling coil control is used to position a set of face and bypassdampers immediately upstream of a chilled water cooling coil.The damper set is modulated to prevent the space temperaturefrom exceeding the desired cooling set point.

If the fan is off, the dampers are positioned to the fullbypass position and the chilled water control valve is closed.

If the fan is on, the UC Open XP control reads the humiditysensor (optional) and compares the value to the high-humiditylimit. If the humidity value exceeds the set point, the damperset modulates to the full face position and the chilled watervalve is opened. If the humidity is below the high humiditylimit, the UC Open XP control reads the space temperature andcalculates the supply air temperature required to satisfy thedesired set point.

Once the required supply-air temperature has been calculat-ed, it is compared to the actual supply-air temperature (read from

the sensor) and the face and bypass damper set is modulated tothe required position. The cooling valve is open whenever thedamper set moves away from the full bypass position.DIRECT EXPANSION COOLING CONTROL — The directexpansion (DX) cooling control regulates the DX cooling sys-tem. The DX cooling system is controlled via the compressorsin the condensing units and are controlled directly by the con-denser's controller. In a VAV system, the compressors are mod-ulated to maintain the supply air temperature set point and out-puts from the RAT and SAT sensors are read directly by thecondenser controller or indirectly via the UC Open XP via theUPC Open BACnet communication option. In a CV system,the compressors are modulated to maintain the space tempera-ture set point, and the outputs from the space temperature ther-mostats can be read directly by the condenser controller or in-directly via the UPC Open BACnet communication option.MIXED-AIR DAMPER CONTROL — The mixed-air dampercontrol adjusts modulating outside-air, return-air, and exhaustair dampers. When outside air conditions are unsuitable foratmospheric cooling, the dampers are held to an adjustableminimum outside air percentage. When outside air conditionsare suitable for atmospheric cooling, the mixed-air dampers aremodulated in an effort to minimize the need for heating or me-chanical cooling. The damper set point is automatically calcu-lated from the desired set points.

If the supply fan is OFF or operating for unoccupiedheating, the mixed-air dampers are kept closed to outside airand open to return air.

If the fan is ON and the control is in the Occupied mode, theUC Open XP control checks to see if the system is in the HEATmode.

If the system is in the HEAT mode, the mixed-air dampersare positioned to provide only the user-configured minimumpercentage of outdoor air. If the system is not in the HEATmode, the UC Open XP control determines if the outside con-ditions are suitable for atmospheric cooling and then comparesthe outdoor-air temperature to the space temperature. If the out-door-air temperature is less than the space temperature, the sys-tem does either an enthalpy check (using an outside-air enthal-py switch) or a differential enthalpy check (return-air enthalpyis compared to outside-air enthalpy).

If outside conditions are suitable, the UC Open XP controlcompares the space temperature to the damper set pointand computes the mixed-air temperature required to satisfyconditions.

Once the required mixed-air temperature has been calculated,it is compared to the mixed-air temperature sensor value.The damper is adjusted as required to maintain the mixed airtemperature set point. The damper adjustment rate is automati-cally limited to prevent nuisance low temperature thermostattripping.ELECTRIC HEATER CONTROL — Electric heater controloperates the electric heater stages as required. The heater isstaged to prevent the space temperature from falling below thedesired set point.

If the supply fan is OFF, all stages of electric heat are turnedoff.

If the fan is ON, the cooling (if present) is not active and theoutside air temperature is less than a user defined setpoint theUC Open XP control reads the space temperature sensor andcalculates the supply-air temperature required to satisfyconditions.

Once the required supply-air temperature has been calculated,it is compared to the actual supply-air temperature to determinethe number of heat stages required to satisfy conditions. If morethan one stage is required, the stages are energized one at a time,with a delay between stages, and each stage will have a user de-finable minimum runtime.

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Variable Air Volume Units OnlyHEATING COIL CONTROL — The heating coil controladjusts the steam or hot water valve. Heat is primarily usedfor Unit Optimal Start (morning warm-up) or Occupied Heat-ing with the valve modulated to maintain desired return-airtemperature.

If the supply fan is OFF, the heating valve is modulated tomaintain a desired minimum supply-air temperature.

If the fan is ON, the cooling (if present) is not active and theoutside air temperature is below a user-adjustable set point, thesystem determines if it is in the unit optimal start mode. If it is,the return-air sensor is read and compared to the OccupiedHeating set point. If heating is required, the UC Open XP con-trol calculates the supply-air temperature required to satisfyconditions.

Once the required supply-air temperature has been calculat-ed, it is compared to the actual supply-air temperature and theheating coil valve modulates to the required position.

Once the unit optimal start is completed, heat is not activat-ed again unless the supply air setpoint falls below the occupiedheating set point.

During cooling or fan-only operation, heat can also be provid-ed to maintain the supply-air temperature when the amount of coldoutside air admitted by the IAQ control causes the temperature tofall below the minimum supply-air duct temperature.

If dehumidification is being provided by the chilled watercoil cooling control the valve is modulated to maintain theminimum supply air duct temperature.FACE AND BYPASS HEATING CONTROL — The heat-ing coil control is used to position a set of face and bypassdampers immediately upstream from a steam or hot waterheating coil. Heat is primarily used for unit optimal start(morning warm-up) or Occupied Heating with the dampersmodulated to maintain the desired return-air temperature.

If the fan is off, the dampers are positioned to the full bypassposition, and the heating control valve is closed. If thesupply-air temperature drops below the minimum desired sup-ply air temperature, the heating control valve is opened as re-quired to maintain the desired set point.

If the fan is on, the UC Open XP control determines if it isin the Unit Optimal Start (morning warm-up) or OccupiedHeating mode. If true, the value of the supply air temperature isread by the UC Open XP control and is compared to the occu-pied heating set point. If heating is needed, the control calcu-lates the supply-air temperature required to satisfy the desiredset point.

Once the control has calculated the required supply-airtemperature, it compares the actual supply-air temperature tothe calculated value and modulates the face and bypass damperset as required to achieve this value.

Once the Unit Optimal Start is completed, heat is not acti-vated again unless the supply-air temperature falls below theoccupied heating set point.

During cooling or fan-only operation, heating is also used tomaintain the supply-air temperature when the amount of coldoutdoor air admitted by the IAQ control causes the supply-airtemperature to drop below the minimum supply-air tempera-ture set point.CHILLED WATER COIL COOLING CONTROL — Thecooling coil control adjusts the chilled water valve. The valveis modulated to maintain desired leaving-air temperature setpoint. The valve is closed whenever the system is in Nighttime(unoccupied) Free Cooling or whenever the supply fan is OFF.

If the fan is ON, the economizer (if present) is disabled orfully open, outside air temperature is greater than a user adjust-able setpoint and the heating (if present) is not active, the UC

Open XP control reads the humidity sensor (optional) and com-pares the value to the high humidity limit.

If the humidity is higher than the humidity limit, the chilledwater valve opens.

If the humidity is below the high humidity limit, or if no hu-midity sensor is supplied, the UC Open XP control reads the sup-ply-air sensor, and compares this value to the desired supply airtemperature set point. The chilled water valve is then modulatedas necessary to maintain the cooling set point.FACE AND BYPASS COOLING CONTROL — The cool-ing coil control is used to position a set of face and bypassdampers immediately upstream from a chilled water coolingcoil. The cooling coil control adjusts the position of the damp-ers to maintain the desired leaving-air temperature set point.

If the fan is off or nighttime (unoccupied) free cooling is ac-tive, the damper set is modulated to the full bypass position andthe chilled water valve is closed.

If the fan is on, the UC Open XP control reads the humiditysensor (optional) and compares the value to the high humiditylimit. If the humidity exceeds the limit, the damper set ismodulated to the full face position and the chilled water valveis opened.

If the humidity is below the high humidity limit, or if nohumidity sensor is supplied, the UC Open XP control reads thesupply air sensor, provided that the return-air temperature hasrisen above the Occupied Heating Set Point. The control thencalculates the desired supply-air temperature set point.

Once the required supply air set point has been calculated, itis compared to the current supply-air temperature and thedampers are modulated to the required position.STATIC PRESSURE CONTROL — The static pressure con-trol adjusts the supply-fan variable frequency drive (optional)in a variable air volume system in order to maintain the ductstatic pressure set point.

If the supply fan is OFF, the minimum speed signal is sentto the variable frequency drive.

If the fan is ON, the control reads the duct static pressuresensor. The system compares the duct static pressure to the setpoint and calculates the required signal that is output to thevariable frequency drive.ELECTRIC HEATER CONTROL — The electric heatercontrol operates the electric heater stages as required. Theheater is primarily used for Unit Optimal Start (morning warm-up) or Occupied Heating, with the heater staged to maintain thedesired return-air temperature.

If the supply fan is OFF, all stages of electric heat are turnedoff.

If the fan is ON, outside air temperature is below an adjust-able set point and the cooling (if present) is not active then theUC Open XP control determines if the stem is in Unit OptimalStart. If it is, the supply air sensor is read and compared to theoccupied heating set point. If heat is required, the UC Open XPcontrol calculates the supply-air temperature required to satisfyconditions.

Once the required supply-air temperature has been calculated,it is compared to the supply-air temperature sensor reading todetermine the number of heat stages required to satisfy condi-tions. The required stages are energized sequentially.

Once the unit optimal start is completed, heat is not activat-ed again unless the supply-air temperature drops below the oc-cupied heating set point.SUPPLY-AIR TEMPERATURE RESET — The supply-airtemperature reset is used to reset the supply-air temperature setpoint upward as the space air temperature falls below theOccupied Cooling set point, but not less than the occupiedheating set point. For every degree that the space temperaturefalls below the occupied cooling set point, the supply air

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temperature set point will be reset upwards at the adjustableamount (nominally 1° F) up to an adjustable maximum (nomi-nally 75 F). When enabled, the supply air cooling set point willbe reset upwards every two minutes.

When the fan is ON, and the system is in the Occupiedmode, the UC Open XP control reads the space temperaturesensor and computes the reset value. If the reset value is greaterthan the reset limit, the UC Open XP control uses the reset limitas the reset value. The modified supply-air temperature setpoint is determined by adding the reset value to the configuredsupply-air temperature set point. This value is then used by thecooling coil and mixed-air damper control algorithm.MIXED-AIR DAMPER CONTROL — The mixed-air dampercontrol modulates the outside-air, return-air, and exhaust-airdampers. When outdoor-air conditions are unsuitable foratmospheric cooling, the dampers are positioned to provideonly the minimum percentage of outside air (adjustable) when-ever in the occupied mode. At all other times the mixed-airdampers are modulated to maintain a mixed-air temperatureequal to the calculated supply-air temperature set point minus2° F.

If the supply fan is OFF, the mixed-air temperature falls be-low an adjustable set point or the freezestat (if present) is on,the mixed-air dampers are held closed to outside air and heldopen to return air. If the supply fan is ON, the control is in oc-cupied mode and the system is in the HEAT mode, the mixed-air dampers are positioned to provide only the user-configuredminimum percentage of outdoor air. At all other times the sys-tem determines if outside-air conditions are suitable for atmo-spheric cooling. The outside-air temperature is compared to thespace temperature and if the outside-air temperature is less thanthe space temperature, the system performs either an enthalpycheck or a differential enthalpy check.

If the outside conditions are suitable, the UC Open XP con-trol modulates the damper to maintain the damper set point.The mixed-air damper opening rate is limited to protect againstnuisance low temperature thermostat tripping.COOLING MODE WITH ECONOMIZING — If the OA(outdoor air) temperature is less than the economizing setpoint, the OA temperature is less than the RA (return air) tem-perature and the OA enthalpy is less than the enthalpy switchset point:• The OA (outdoor air) and Recirc dampers will modulate

to maintain discharge air temperature at the discharge airtemperature set point.

• EA (exhaust air) and OA bypass dampers will remain100% open.

• Unit cooling and heating coil valves will remain closed.• The ERV exhaust fan will be enabled and run continuously.

Demand Controlled Ventilation (DCV) — The en-ergy recovery system sequence of operations is unchanged bythe incorporation of DCV. The CO2 sensors may override thenormal thermal controls and airflow measuring system (ifused) in some situations. The sequences included belowdiscuss the ventilation functions only and must be added to thedesigner’s description of thermal controls to create completeoperating sequences.CONSTANT VOLUME — PURGE CYCLE — At air handlerstart-up, the outdoor-air damper shall open, initiating a timedpurge cycle. The outdoor-air damper shall modulate tomaintain a predetermined percentage of outdoor air. The purgecycle shall be adjustable and set for a predetermined period oftime.

The air handler controller shall modulate its preheat coil tomaintain the discharge-air temperature set point if the mixed airtemperature falls below the discharge-air temperature set point.At the conclusion of the timed purge cycle, the outdoor-airdamper shall modulate closed to maintain a predetermined

base ventilation rate and the DCV control algorithm shall beenabled.CONSTANT VOLUME — SINGLE AND MULTI-ZONEAPPLICATIONS — All zones served by the air-handling unitshall be polled and the highest CO2 sensor reading will betaken by the air handler controller and used to control theoutdoor-air damper. The worse case CO2 reading shall becompared to the CO2 set point at the unit controller. If thereading is below an adjustable set point (nominally 550 ppmabove outside air CO2 levels), the air handler shall maintain thepredetermined minimum outdoor-air damper position. If thereading is above the set point, the air handler controller shallmodulate the outdoor-air damper open to increase the amountof ventilation to the space and reduce the CO2 concentration.Once the CO2 levels drop below the set point, the outside-airdampers shall modulate to maintain the base ventilation rate.

The economizer function is enabled when the air handlercontroller determines that it is beneficial to use outside air forcooling the space. Once the economizer function is enabled, ascommanded by the air handler controller, the outdoor-airdamper will modulate between minimum position and fullyopen to maintain the discharge-air temperature at the econo-mizing set point.VARIABLE-AIR-VOLUME SYSTEMS — Each zone con-troller shall include the inherent ability to override the tempera-ture control loop and modulate the VAV box's damper based ona CO2 sensor and its associated set point schedule. The zonecontroller shall be capable of maintaining a ventilation set pointthrough a DCV algorithm in conjunction with the air-handlingunit to fulfill the requirements of ASHRAE standard, 62-1989“Ventilation for Acceptable Indoor Air Quality” (includingAddendum 62a-1990).

The DCV control function shall determine the zone ventila-tion airflow based on the CO2 zone sensor input value. Whenthe DCV function is enabled, the zone controller shall override(increase) the primary airflow in order to provide additionalventilation as required to maintain the CO2 set point if the baseventilation airflow is insufficient to meet the zone ventilationrequirements. A control algorithm shall be used to determinethe required airflow in order to maintain the required ventila-tion rate in the space (maintain the CO2 sensor reading at thedesired zone set point).

Whenever the air-handling system is in the occupied mode,the air handler controller shall maintain the base ventilationrate (minimum outdoor air damper position) until overriddenby the system DCV function.

All zone controllers working with a given air-handling unitshall be polled and the highest CO2 sensor reading will be tak-en by the air handler controller and used to control the outdoor-air damper. The worse case CO2 reading shall be compared tothe CO2 adjustable set point (nominally 750 ppm CO2) at theunit controller. If the reading is below the set point, the air han-dler shall continue to maintain the base ventilation. If the read-ing is above the set point, the air handler controller shall modu-late the outdoor-air damper open to increase the amount of out-door air ventilation. Once the CO2 levels drop below the setpoint, the outside-air dampers shall modulate to maintain thebase ventilation rate.

The economizer function is enabled when the air handlercontroller determines that it is beneficial to use outside air forcooling the space. Once the economizer function is enabled, ascommanded by the air handler controller, the outdoor-airdamper will modulate between minimum position and fullyopen to maintain the discharge-air temperature at the econo-mizing set point.

Component specific control sequences help to maximize theamount of energy recovered by the total energy recovery wheelsection.

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GUIDE SPECIFICATIONS

Central Station Air-Handling ControlGuide SpecificationsNOTE: The following guide specification is provided to assistin specifying central station air-handling unit controls. Thereare several options that may be applied, depending on theapplication requirements. These specifications have been writ-ten such that the equipment supplier is also the temperaturecontrol vendor.

Part 1 — General1.01 SYSTEM DESCRIPTION

A. Aero® 39M central station air-handling unit controls aredesigned to provide air to a conditioned space asrequired to meet specified performance requirementsfor ventilation, heating, cooling, filtration and distribu-tion on both constant volume (CV) and variable airvolume (VAV) systems.

B. The control box shall be mounted in the control plenumin a NEMA-type enclosure.

1.02 MICROPROCESSOR CONTROLLERThe integrated controls shall include a factory-installedsolid-state microprocessor controller using direct digitalcontrol. The microprocessor controller shall be factoryinstalled and wired within the control box for the centralstation air-handling device. The system software shall befield installed as the UC Open XP does not containfactory-installed software.

1.03 BUILDING CONTROL SYSTEM NETWORK INTERFACEThe control shall have the ability to interface and com-municate directly to the building control system withoutthe use of additional field-installed hardware or software.Other manufacturers’ building control systems may beused to interface to the equipment control. This function-ality shall be provided through the additional hardwareinputs and outputs of the control. Functions such asequipment start/stop, supply-air temperature set pointadjustments (VAV), and alarm condition identificationmust be provided.

Part 2 — Products2.01 UNIVERSAL CONTROLLER XP (UC OPEN XP)

Central Station Air Handler:The controller shall be a solid-state microprocessor-based controller used to control each function of theapplicable HVAC equipment using Direct Digital Con-trols (DDC) and specifically designed software. The con-trols shall be capable of providing stand-alone operation.All application software actually performing the requiredcontrol functions shall be configured and supplied by afield service technician separate from the controller. Thecontrol shall accept analog and digital signals from sen-sors, switches, relays, etc. and shall multiplex the varioussignals into digital format. All closed-loop DDC routinesshall utilize controller based software algorithms thatshall be resident in the controller memory.The controller shall be shipped in a NEMA rated-enclo-sure and will be mounted inside the control plenum whenthe factory wired option is selected. An on/off switchshall be field installed and wired next to each controlpanel. The factory shall mount all panel mounted electri-cal components inside the factory-supplied control ple-num when the factory-wired option is selected. Controltransformers for the controlled devices shall also be fac-tory supplied and wired. The controller shall include and maintain an internal timeclock function and shall receive time scheduling

information from a network occupancy schedule or Link-age thermostat time schedule. The time clock functionshall also be capable of interfacing to a dry contact toperform occupancy override. Timed override requestsshall be performed by each control without any networkrequirement.The controller shall not require a battery. All configura-tion data is to be stored in non-volatile memory. Systemsthat require a battery to store data are not acceptable.Alarm/Alert Processing — The controller shall contain aroutine to process alarms and alerts. Alarm/alert process-ing shall consist of a scan of all input points. Certain ana-log alarms/alerts shall only be monitored when thecontroller is in the occupied mode (i.e., static pressure,CO2, relative humidity, etc.). Time delays shall be pro-vided with the software to prevent nuisance alarms/alertsduring a transition period or if a set point change occurs.The controller shall also be capable of providing localalarm/alert indication for out of limit conditions, status,thermistor or sensor failure. All alarms/alerts shall be dis-played at a portable PC and via the network to a remoteoperator’s station or alarm printer as applicable.

A. VAV and CV standard control hardware:The controller can include the following standard con-trol hardware when ordered for both VAV and CVapplications:1. Supply-Air Sensor:

The factory-supplied sensor shall be a thermis-tor type (RTDs [Resistive Temperature Device]shall also be acceptable), and shall be factoryinstalled in the fan scroll. The sensor shall befactory wired to the controller inside the fac-tory-provided control box.

2. Outside-Air Sensor:The sensor shall be a thermistor type (RTDsshall also be acceptable), factory or field sup-plied for each air handler for field mounting andwiring. The sensor shall be installed upstreamfrom the outside-air damper where it shall accu-rately sense the temperature of the outside airentering mixing box. Each air handler shallinclude its own outside-air sensor unless allunits are being served by a common outside airplenum.

3. Return Air Sensor (VAV only):The sensor shall be a field-supplied 6-in. probeas a minimum. The sensor shall be a thermistortype (RTDs shall also be acceptable), encased ina stainless steel probe to resist corrosion,supplied for each air handler for field mountingand wiring.

4. Space Temperature Sensor (CV only):The sensor shall be field supplied for fieldinstallation as shown on the plans. The sensorshall consist of a thermistor (RTDs shall also beacceptable), terminal block with screw terminalsmounted on a printed circuit board, push buttonfor remote occupant override, and a remotecommunication port. Space sensors shallinclude a space temperature adjustment slide foroccupant adjustment. The range of adjustmentshall be configurable from 0° to 20 F and maybe disabled. The sensor shall be mountedapproximately 60 in. from the floor and shall be

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capable of mounting directly to a wall or to awall-mounted standard American electrical box.

5. Fan Relay:The relay shall be factory installed and wired inthe control box. The relay shall be a SPDT typeand shall interface to the fan motor starter cir-cuit through field wiring to the starter.

6. Fan Status Switch:The switch shall be factory installed and wiredin the control box. The switch shall be a SPDTsnap-acting switch with an amperage rating of0.32 to 150 amps continuous.

B. Variable Air Volume (VAV):The controller can include the variable and constantvolume control hardware when ordered for each vari-able air volume central station in addition to the above.

C. Variable and Constant Volume Control Options:The following control hardware shall be provided foreach central air handler device if the control hardwareor associated control function is listed in the I/O sum-mary and/or the sequence of operation:1. Mixed Air Temperature Sensor:

The factory-supplied sensor shall consist ofmultiple thermistor sensors evenly spaced andencased in a flexible copper tube. The sensorshall provide both mechanical and electricalaveraging to achieve the average temperaturemeasurement over the entire element length.The sensor shall be factory installed in the mix-ing box on the downstream side of the filters forcombination filter/mixing boxes, and shall alsobe serpentined to sense the average temperature.The factory shall provide the wiring from thesensor to the factory-installed control boxmounted on the unit. The sensor shall be pro-vided in two different sizes; 12 ft or 24 ft basedon the mixed-air chambers size/configurationand the manufacturers recommendations.

2. Low Temperature Thermostat:The Low Temperature thermostat (LTT) shallinclude a 20-ft long, factory installed, capillarystrung out in the airstream to protect the coil.Multiple LTTs shall be supplied if required. Thesensor is factory wired to the control box. Thecontacts shall be wired to the control circuit tostop the supply fan and shall also be wired to thecontroller for alarm monitoring. The LTT shallbe manually reset from the control panel.

3. Outdoor/Return/Space Relative HumiditySensors:The humidity sensors shall be factory or fieldsupplied and field mounted and wired. The sen-sors shall use bulk polymer resistance technol-ogy to eliminate the effects of surfacecontamination. The wall-mounted RH sensorshall be enclosed within a decorative case. Thesensors shall have a measuring range of 0 to95% with an accuracy of ± 3% at 25 C.

4. Filter Status Switch:The filter maintenance switch shall be factoryinstalled in the first filter section of the unit. Thefilter switches shall measure the differentialpressure across the filter. The switch shall havean adjustable set point range of 0.05 to 2.0 in.wg. The controller shall be capable of monitor-ing more than one filter bank, each bank with itsown filter maintenance switch. All filter

switches (as applicable) shall be field wired tothe control panel.

D. Actuators:1. Valve Actuators:

All valve actuators, shipped from the factory,mounted on complete valve assemblies, shall beequipped with spring return capability unlessthe valve services a non-critical application. Theactuators shall use electric motors. Each actua-tor (heating and cooling) shall be independentlypowered by a Class II transformer, protected bya resettable circuit breaker, located in the con-trol box. Each actuator shall be capable of inter-facing to a modulating output control signal andshall include the capability to hold its positionanywhere in its stroke. The valve actuators shallbe factory mounted with the appropriate linkageconnection on the selected valve assembly forfield installation.

2. Damper Actuators:The damper actuators shall be factory suppliedand installed when ordered. The actuators shallinclude an electronically controlled reversiblemotor equipped with a microprocessor drive.The drive shall provide a constant speed regard-less of load. Actuators shall be capable of hold-ing their position at any point in the stroke ineither direction. Each actuator shall be capableof interfacing to a modulating output controlsignal. The manufacturer shall guarantee tomeet the torque requirements of the dampers.Two-position minimum outdoor-air damperactuators shall be field supplied with a field-powered actuator guaranteed to interface to thefactory provided output relay. All wiring shallbe field installed.

E. Valves:All new control valves shall be supplied by the manu-facturer. All valves shall be sized by the building con-trol contractor and shall be guaranteed to be ofsufficient size and to meet the capacities shown. Two-way and three-way valves shall be equal percentagetype globe valves with a brass body, seat and plug,stainless steel stem, composition disc and spring loadedTeflon-coated V-ring packing. The valve body shall bebrass, globe, screwed, FNPT type and shall be rated at40 to 281 F at 250 psig.

F. Control Algorithms:1. Fan Control:

The supply fan shall be started and stoppedbased on an occupancy schedule, Nighttime(unoccupied) Free Cooling, smoke control(when applicable), unoccupied heating or cool-ing, demand limiting, network command, andtimed override. (Starting and stopping of motorfor demand limiting shall pertain only when tiedinto a network.)The start of an occupied period shall be deter-mined by either the occupancy schedule, remotetimed override, the unit optimal start routine, orif the remote start contact opens (see I/O sum-mary and/or sequence of operation for require-ments). If unit optimal start is not selected thesupply fan shall start at the occupied timeentered in the occupancy schedule. If unit opti-mal start is selected, the fan shall be started atthe calculated start time. The fan shall stop atthe unoccupied time entered in the occupancy

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schedule. Timed override shall also be used toextend the occupied schedule for up to a userdefined limit). Timed override shall be initiatedby the operator or by an occupant pushing theoverride button on the space sensor, if enabledby the operator.During unoccupied period whenever the spacetemperature falls below the unoccupied heatingset point (VAV systems shall use return-air tem-perature) or rises above the unoccupied coolingset point the supply fan shall run until the spacetemperature has returned to the required unoc-cupied space temperature limits.The supply fan shall also run during the unoccu-pied period when the unit is in the NighttimeFree Cooling mode to pre-cool the space prior tooccupancy.

2. Nighttime (Unoccupied) Free Cooling (UFC):The nighttime free cooling mode will operateonly during unoccupied hours. When enabled,the controller will measure the space tempera-ture and modulate the economizer to maintainthe space occupied cooling setpoint. This modewill be enabled via a user selectable switch. Nighttime free cooling shall not operate if theoutside air temperature is below a user-select-able value or if the algorithm determines that theenthalpy of the outside air is unsuitable.

3. Unit Optimal Start:The Unit Optimal Start shall include thecapabilities necessary to minimize the unoccu-pied warm-up or cool-down period while stillachieving comfort conditions by the start of thescheduled occupied period. High and low space temperature alarms shall beprovided with the Unit Optimal Start algorithm.Both alarms are based on deviations from thezone temperature by a user definable amount.

4. Heating Coil Control:a. The heating coil routine shall modulate the

heating valve to maintain the conditionedspace's heating set point based on the supplyair temperature. The heating coil routineshall also modulate the heating coil valvewhen the freezestat (if present) is on to main-tain a minimum duct temperature to helpprotect against freezing. The dual loop PIDcontrol algorithm shall utilize the space tem-perature sensor as the master sensor and thedischarge sensor as the submaster sensor.During VAV only, the heating coil valve willopen whenever the supply-air temperaturedrops from 40 F to a user-adjustable level,normally set at 35 F.

b. Electric Heater Control (CV) — If the fan ison, cooling (if present) is not active and theoutside-air temperature is less than a user-defined set point, then the control shall readthe space temperature and calculate therequired supply air temperature to satisfyconditions. Once the required supply-airtemperature has been calculated, it shall becompared to the actual supply-air tempera-ture to determine the number of heat stagesrequired to satisfy conditions. The electricheat control shall also provide for unoccu-pied heating whenever the space temperaturedrops below the heating unoccupied set

point. If more than one stage is required, thestages shall be enabled one at a time with atime delay between stages.

c. Electric heater Control (VAV) — When thesupply fan is on, cooling (if present) is activeand the outside air temperature is less thanthe user defined setpoint, the controller shalldetermine based on the space and supply-airtemperature if heating is required. If it is, thecontroller compares the return-air tempera-ture to the occupied heating set point orunoccupied heating set point. If heat isrequired, the controller shall calculate thesupply-air temperature required to satisfyconditions. Once the supply-air temperatureis calculated it shall be compared to thesupply-air temperature sensor reading todetermine the number of stages required tosatisfy conditions.

d. Heating — Face and Bypass (CV) — Thisroutine shall modulate a face and bypassdamper to prevent the space temperaturefrom falling below the occupied/unoccupiedheating set point. When the supply fan is on,outside-air temperature is less than a user-definable set point and cooling (if present) isnot active, the controller shall measure thespace temperature and open the heating coilvalve in sequence with the face and bypassdampers to maintain its heating set point.The heating coil valve will open wheneverthe freezestat (if present) is on.When the fan is off, the damper shall bepositioned to the full bypass position and theheating valve shall be closed.

e. Heating — Face and Bypass (VAV) — Thisroutine shall modulate a face and bypassdamper to prevent the supply-air temperaturefrom falling below the occupied/unoccupiedheating set point. When the supply fan is on,outside-air temperature is less than a user-definable set point and cooling (if present) isnot active, the controller open the heatingvalve in sequence with the face and bypassdampers to maintain its heating setpoint. Theheating coil valve will open whenever thefreezestat (if present) is on. When the fan is off, the damper shall bepositioned to the full bypass position and theheating valve shall be closed.

5. Cooling Coil Control:a. The cooling coil (CV) routine shall modulate

the cooling coil valve to maintain the condi-tioned space’s cooling set point. The valveshall be closed whenever the space tempera-ture is below the cooling set point. When thesupply fan is on, the outside-air temperatureis greater than a user-defined set point, andthe economizer (if present) is disabled orfully open, the controller will modulate thecooling coil valve to maintain the space tem-perature below its cooling set point. Thecooling coil valve will open to a user defin-able percentage whenever the freezestat (ifpresent) is on.For those units that require dehumidificationcontrol (see I/O summary and/or thesequence of operation) the control valveshall open whenever the humidity sensor

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exceeds its (adjustable) humidity set pointand calls for dehumidification.

b. The cooling coil (VAV) routine shall modu-late the cooling coil valve to maintain thedesired supply-air temperature set point.When the supply fan is on, the outside-airtemperature is above a user-definable set-point, heating (if present) is not active andthe economizer (if present) is disabled orfully open, the controller will modulate thecooling coil valve to maintain the supply airtemperature below its cooling set point. Thecooling coil valve will open to a user defin-able percentage when the freezestat (if pres-ent) is on.For those units that require dehumidificationcontrol (see I/O summary and/or thesequence of operation) the cooling coil con-trol valve shall open whenever the humiditysensor exceeds it user adjustable humidityset point.

c. Cooling — Face and Bypass (CV) — Whenthe supply fan is on, the outside-air tempera-ture is greater than a user-definable level, theeconomizer (if present) is disabled or fullyopen, heating (if present) is not active andthe space temperature is above the coolingset point, then the face and bypass damperswill modulate open to face position (closedto bypass position) to maintain the supply airtemperature set point by modulating the airpassing over the cooling coil. When thespace temperature is less than the cooling setpoint, the face and bypass dampers will closeto the face position (open to bypass posi-tion). When the fan is off the dampers shall bepositioned to the full bypass position and thechilled water valve shall be closed.For those systems that require a dehumidifi-cation cycle (see I/O summary and/orsequence of operation) the damper and valveshall be opened fully.

d. Cooling — Face and Bypass (VAV) — Whenthe supply fan is on, the outside-air tempera-ture is greater than a user definable level, theeconomizer (if present) is disabled or fullyopen, heating (if present) is not active andthe supply-air temperature is above the userdefined cooling set point, then the controllerwill open the cooling coil valve and modu-late the face and bypass dampers open toface position (closed to bypass position).When the supply-air temperature is less thanthe cooling set point, the face and bypassdampers will close to face position (open tobypass position). The cooling coil valve willopen whenever the freezestat (if present) ison.For those systems that require a dehumidifi-cation routine (see I/O summary and/orsequence of operation) when the spacehumidity sensor exceeds its high limit setpoint, the dampers shall be positioned to thefull face position with the chilled water valveopen.

6. Direct Expansion Cooling Control:The direct expansion (DX) cooling control regu-lates the DX cooling system. The DX cooling

system is controlled via the compressors in thecondensing units and are controlled directly bythe condenser's controller. In a VAV system, thecompressors are modulated to maintain the sup-ply air temperature set point and outputs fromthe RAT and SAT sensors are read directly bythe condenser controller or indirectly via the UCOpen XP via the UPC Open BACnet communi-cation option. In a CV system, the compressorsare modulated to maintain the space temperatureset point, and the outputs from the space temper-ature thermostats can be read directly by thecondenser controller or indirectly via the UPCOpen BACnet communication option.

7. Mixed Air Damper Control:a. The mixed air damper routine (CV) shall

modulate the outside, return and exhaust airdampers, as applicable. When an enthalpycomparison by the routine determines thatthe outside-air conditions are unsuitable foratmospheric cooling, the dampers shall bepositioned to admit an adjustable, minimumoutside air percentage when in the occupiedmode. When the enthalpy comparison determinesthat outside-air conditions are suitable foratmospheric cooling, the mixed-air dampersshall be modulated to maintain a space tem-perature that is between the heating andcooling set points in an effort to minimizethe need for mechanical cooling or heating(the controller shall automatically providethis value based on the set points entered).The damper adjustment rate shall be auto-matically limited to prevent nuisance lowtemperature thermostat tripping.During the unoccupied cycle and unit opti-mal start, the mixed-air dampers shall bekept closed to outside and exhaust air andopen to return air unless the system has beenindexed to nighttime free cooling.The minimum damper position shall be thegreatest of the supplied configured minimumpercentage position(s), as applicable, fromthe Indoor Air Quality routine or this routine,whichever is greatest.If the supply fan is off, the mixed-air damp-ers shall be kept closed to outside andexhaust air and open to return air.

b. The mixed air damper (VAV) routine shallmodulate the outside, return, and exhaust airdampers as applicable. When an enthalpycomparison by the routine determines thatoutside air conditions are unsuitable foratmospheric cooling the dampers shall beheld at an adjustable minimum position ormodulated to a minimum position deter-mined by the IAQ routine, as applicablewhen in the occupied mode. When theenthalpy comparison determines that out-side-air conditions are suitable for atmo-spheric cooling, the mixed-air dampers shallbe modulated to maintain a mixed-air tem-perature equal to the supply air temperatureset point (plus any reset value) minus 2°F.For those systems with mechanical cooling,this routine shall ensure that outside air isalways fully utilized as the first stage ofcooling (when available) and that the

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mechanical cooling is always disabled firstas the load decreases.During the unoccupied cycle and unit opti-mal start the mixed-air dampers shall be keptclosed to outside and exhaust air and open toreturn air unless the system has been indexedto nighttime free cooling. If the supply fan isoff, the mixed-air dampers shall be keptclosed to outside and exhaust air and open toreturn air.The dampers shall also be capable of beingmodulated to maintain a desired temperatureset point set by the operator.The controller shall be capable of providinga protection feature that shall automaticallylimit the amount of outside air to prevent themixed-air temperature from falling below anadjustable set point (nominally 45 F).

c. Two-Position Damper Control — Two-posi-tion damper control shall be used to controltwo-position outside dampers to provideminimum outside-air ventilation.If the supply fan is off, the damper shall beclosed. If the supply fan is on, the controlshall determine if the unit is in the Occupiedmode. If the unit is in the Occupied mode thedampers shall open. If the unit is in theUnoccupied mode the dampers shall remainclosed, however, the dampers shall openwhen the unit is indexed to Nighttime FreeCooling.

8. Supply Air Duct Static Pressure Control:The controller shall modulate the supply-fanVFD speed to maintain the duct static pressureset point. When the supply fan is off, the driveshall be reset to an adjustable minimum speedvalue. When the supply fan is on, the controllershall read the duct static pressure and the PIDcontrol algorithm shall compute the drive outputrequired. The controller shall compare the actualduct static pressure to the desired set point valueand re-calculate the required signal output to thedrive.

9. Indoor Air Quality (IAQ):The controller shall be capable of monitoringand alarming an IAQ sensor or may be used tomaintain a IAQ set point by overriding the cur-rent minimum mixed-air damper position whenthe IAQ sensor exceeds its operator adjustableset point of CO2 concentration. This routineshall also be subject to a field selectable lowtemperature override based on the mixed-air orsupply-air temperature.The IAQ routine shall be capable of suspendingits damper override position based on spacetemperature and humidity.

10. Filter Status Control:The controller shall monitor an airflow switchor switches, as applicable, measuring the differ-ential pressure between the upstream and down-stream side of the filter(s) for all units that listfilter status within the I/O summary. When thefilter becomes dirty or needs to be replaced, theairflow switch shall input a discrete signal to thecontroller, that will in turn, generate an alarm atthe portable PC or EMS operator’s station, iftied into a network.

G. Portable PC Local Interface:Each controller shall include the inherent ability to beadded to a network or to be modified without the addi-tion of any external devices. If connected to a EMS net-work and/or if a portable PC with EMS software isplugged into the controller the operator shall haveaccess to input set point and configuration data, displayconditions, alarms, etc.

H. Network Compatible:The factory-installed Product Integrated Control shallhave the resident capacity of connecting onto a commu-nication network with other like controllers and com-municating with other compatible microprocessor-based controllers and PCs. Controllers that do notinclude this resident capability without adding addi-tional hardware are not acceptable.Network features. The controller shall support the fol-lowing network features:1. Data collection and transfer2. Interface to a local and/or remote EMS opera-

tor's station3. Interface to portable PC or alarm printer 4. Demand Limiting and Maintenance Manage-

ment5. Dynamic Linkage to Air Terminals6. Interface to Field Installed Controllers (FICs) to

provide custom programming access7. Interface to a linkage thermostat (CV only)

Demand Control Ventilation (DCV) Guide Specifications1.01 SENSORS

A. Wall-Mounted Combination Sensors:1. Wall-mounted combination sensors shall con-

tain a space temperature sensor and carbondioxide (CO2) sensors in a single, decorativehousing.The CO2 sensor shall use Single-BeamAbsorption Infrared™ diffusion technology(non-dispersive infrared), and shall haveintegral programming to perform automaticbaseline calibration without user interface. Therecommended manual recalibration period shallnot be less than five years.Other features of wall-mounted combinationsensors shall include:a. Operating conditions: 60 to 90 F (15 to

32 C), and 0 to 95% RH, non-condensing.b. Power supply: 18 to 30 vac, 50/60 Hz (18 to

42 vdc polarity protected).c. CO2 sampling method: diffusion. d. CO2 sensor output: 4 to 20 mA or 0 to

10 volt signal.e. CO2 measurement range: 0 to 2,000 ppm.f. Sensitivity: ±20 ppm.g. Accuracy: ±100 ppm at 60 to 90 F (15 to

32 C); and 760 mm Hg.h. CO2 sensor calibration: single point calibra-

tion via push button and LED.i. Space temperature sensor: 10,000 ohm ±2%

at 77 F (25 C) thermistor with push buttonoverride (and a temperature set point adjust-ment potentiometer).

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2. Combination sensors shall be provided with themanufacturer’s recommended carbon dioxide cali-bration kit. The quantity shall be suitable to initiallycalibrate each sensor provided for the project.

B. Wall-Mounted Carbon Dioxide Sensors:1. Carbon dioxide (CO2) sensors shall be manufac-

tured in a decorative, wall-mounted housing.The CO2 sensor shall use single-beam ordual-beam absorption infrared diffusion tech-nology (non-dispersive infrared), and shall haveintegral programming to perform automaticbaseline calibration without user interface. Therecommended manual recalibration period shallnot be less than five years. Sensors shall beequipped with an LED display.Other features of wall-mounted carbon dioxidesensors shall include:a. Operating conditions: 60 to 90 F (15 to

32 C), and 0 to 95% RH, non-condensing.b. Power supply: 18 to 30 vac, 50/60 Hz half

wave rectified (18 to 42 vdc polarityprotected).

c. CO2 sampling method: diffusion or flowthrough.

d. CO2 sensor output: 4 to 20 mA or 0 to10 volt signal.

e. CO2 measurement range: 0 to 10,000 ppm.f. Set point: adjustable.g. Sensitivity: ±10 ppm.h. Accuracy: ±50 ppm (0 to 2000 ppm), ±5% of

reading (2000 to 10,000 ppm).i. CO2 sensor calibration: single point calibra-

tion via push button and LED.j. Relay contacts: normally open or normally

closed, 2 amps at 24 vac.2. Carbon dioxide sensors shall be provided with

the manufacturer’s recommended calibrationkit. The quantity shall be suitable to initially cal-ibrate each sensor provided for the project.

C. Duct-Mounted Carbon Dioxide Sensors:1. Carbon dioxide (CO2) sensors for duct-mounted

applications shall be identical to the wall-mounted sensors specified above except asdescribed below.

2. The CO2 sensor shall be mounted in an enclosedaspirator box that mounts directly to the duct.The aspirator box shall be equipped with aninduction tube to direct a side-stream of air fromthe duct through the CO2 sensor. A hinged, clearaccess door shall be installed on the front of theaspirator box to permit access to the sensor andto permit viewing the sensor without openingthe door.

3. CO2 sensors for duct-mounted applications shallbe designed for flow-through sampling.

1.02 CONTROLLERSThe following paragraphs describing DCV requirementsfor solid-state, microprocessor (direct digital) controllers,and should be inserted as supplements to the project con-troller specifications. They are not intended to describethe complete requirements for controllers.

A. Zone Controllers:1. Each single-duct (fan-powered) zone controller

shall be specifically designed to provide demand

controlled ventilation (DCV) operation using aproportional-integral (PI) control loop. The zonecontroller shall be capable of stand-alone opera-tion and shall execute the DCV control functionswithout being dependent on a network system,additional hardware, or intermediate controllers.

2. Zone controllers shall be capable of being addedto a system network without additional hard-ware. They shall be designed for connection toother zone controllers and to a common systemcontroller to perform DCV control functions aspart of an integral ventilation system.

3. Zone controllers shall be designed to interfacedirectly with the specified CO2 sensors.

4. Zone controllers shall be capable of maintaininga ventilation set point through a DCV algorithmin conjunction with system controller to fulfillthe requirements of ASHRAE standard, 62-1989“Ventilation For Acceptable Indoor Air Quality”(including Addendum 62a-1990). The algorithmshall also be capable of modulating the terminalunit heating to maintain the space temperaturebetween the heating and cooling set points. Forterminal units without supplementary heating,the zone controller DCV algorithm shall have aprimary airflow limit to protect the zone fromovercooling.

5. DCV control sequences shall be as specifiedherein (or as indicated on the drawings).

B. System Controllers:1. System controllers shall be specifically designed

to provide demand controlled ventilation (DCV)operation using a proportional-integral (PI) con-trol loop. All DCV application software shall beresident in the system controller’s memory andshall be factory-tested and factory-configured.The system controller shall be capable of stand-alone operation and shall execute the DCVcontrol functions without being dependent on anetwork system, additional hardware, or inter-mediate controllers.

2. The system controller shall be designed forconnection to zone controllers to perform DCVcontrol functions as part of an integral ventila-tion system.

3. The system controller shall be designed to inter-face directly with the specified CO2 sensors.

4. The system controller shall be capable of main-taining a ventilation set point through a DCValgorithm in conjunction with zone controllersto fulfill the requirements of ASHRAE standard,62-1989 “Ventilation For Acceptable Indoor AirQuality” (including Addendum 62a-1990).

5. DCV control sequences shall be as specifiedherein (or as indicated on the drawings). Unit(Product Integrated) Controllers:a. The unit controller shall be a solid-state

microprocessor controller using direct digitalcontrol and software specifically designed toprovide demand controlled ventilation (DCV)functions.The controller shall be factory-installed andwired within the unit, and shall be furnishedcomplete with all application software toperform DCV functions. The unit controllershall be pre-configured and pre-tested forDCV operation.

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b. The controller shall maintain an adjustableCO2 set point by control of the mixed-airdamper position. The unit controller shallalso have the ability to limit the maximumamount of outdoor air during DCV

operation, and modulate heating to maintaina minimum supply air temperature.

c. The unit controller shall be designed to inter-face directly with the specified CO2 sensors.

d. DCV control sequences shall be as specifiedherein (or as indicated on the drawings).

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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-51390002-01 Printed in U.S.A. Form 39M-3XA Pg 32 9-12 Replaces: 39M-2XA

Copyright 2012 Carrier Corporation


61, 272 XP , 272 XP G

61, 272 XP , 272 XP G

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Xp not windows xp

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Sugar: The Bitter Truth 2009 2010 Funding Viewership 2011-2012 UCTV Channels YouTube Channel Subscribers UCTV’s YouTube Channel Other UC Public-Serving YouTube Channels UCTV’s

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JABRA UC Élégant et léger Micro-casque UC …/media/Product Documentation/Jabra...Systèmes d'exploitation pris en charge : Windows XP, Windows Vista (32 bits, 64 bits), Windows

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Vertical Spindle Machining Center2.imimg.com/data2/XT/IC/MY-/akira-seiki-vmc-full-line...2009/02/16  · V2 XP V2.5 XP V3 XP V4 XP V5 XP V4.5 XP V5.5 XP V6 XP V8 XP Performa Classic

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390 XP , 390 XP G

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The Channel challenges of UC

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CalculationandAnalysisofMicrostateRelatedtoVariationin ...downloads.hindawi.com/journals/cin/2018/9270685.pdf · this study was a 16-channel EEG amplifier (Mipower-UC EEGCollectionV2,NeuralEngineeringLaboratory,Tsinghua

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[XP Day Vietnam 2015] XP is not windows XP

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Esec 2100 xP Esec 2100 xP

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