Installation/ Operator Programming UCM 4.0 and Wireless ...€¦ · UCM Status UCM Set Points UCM...

Installation/OperatorProgramming

UCM 4.0 andWireless VAVCommunication

VAV-SVX01B-ENMay 2001

©American Standard Inc. 1999 VAV-SVX01B-EN

Chapter 1 – General Information 4UCM Control Module 4.0 (UMC 4.0)SpecificationsUCM 4.0 EnhancementsUCM 4.0 FeaturesShippingStorage

Chapter 2 – VAV Start-Up/Check-Out Procedure 6Pre-power Up Checkout for the UCM 4.0UCM Operational LEDsZone Sensor Checkout

Chapter 3 – UCM 4.0 Installation and Wiring 7UCM 4.0 Power WiringZone Sensor WiringCommunication WiringDIP Switch Settings

Chapter 4 – UCM 4.0 Programming and Operation 14Typical UCM Operating BehaviorUCM StatusUCM Set PointsUCM Setup

Chapter 5 – Sequence of Operations 24Single Duct UnitsParallel Fan-Powered UnitsSeries Fan-Powered UnitsZone Sensor FfunctionsFlow SensorFailure Modes

Contents

VAV-SVX01B-EN 3

Contents

Chapter 6 – Air and Water Balancing 28Air BalancingWater Balancing

Chapter 7 – Wireless VAV Systems 30

Chapter 8 – Trouble-Shooting 38UCM 4.0 ProblemsWireless Receiver Problems

Chapter 9 – Appendix 42

4 VAV-SVX01B-EN

Chapter Overview

This chapter contains informationabout the following�Unit Control Module 4.0 (UCM 4.0)

� Specifications

�UCM 4.0 Enhancements

�UCM 4.0 Features

� Shipping

� Storage

Unit Control Module 4.0(UCM 4.0)The UCM 4.0 is a microprocessor-based, Direct Digital Controller (DDC)for the (Variable Air Volume) VAVterminal unit. It contains the controllogic to modulate the flow of supply airthrough the VAV terminal in responseto the load requirements within the VAVzone.The function of the UCM is to controlthe VAV terminal unit to vary thevolumetric airflow rate to the zone. VAVunits are available with eitherpneumatic, analog electronic, ormicroprocessor controls (DDC VAV).This manual discusses only terminalunits with DDC/VAV controls. Factoryinstalled DDC/VAV controls areavailable with all single duct terminalunits, including parallel fan-powered,and series fan-powered units. TwoUCMs are required for dual duct units(one for the heating duct and one forthe cooling duct).

The UCM modulates a VAV’s damperblade based on a zone temperature,measured airflow, and set points tocontinuously control conditioned airdelivery to the space. The volume ofincoming air is monitored and thedamper adjusts to provide accuratecontrol independent of the ductpressure. The damper modulatesbetween operator set points dependingon space conditions. Additionally, fanand heat outputs may be energizeddepending on the application. Availableinputs include a twisted/shieldedcommunication link, zone sensor,auxiliary temperature sensor (optional),CO2 Sensor (optional), and Occupy/Unoccupy Sensor (optional), and 24VAC power.

Specifications

Power Requirements

The UCM 4.0 requires 24 VAC, 50/60 Hz,and up to 50 VA, depending on thenumber of heat outputs (stages), whichconsume 10 VA each.

Operating Environments – UCM 4.0

0°– 140°F (0°– 60°C), 10% to 90% relativehumidity, non-condensingStorage Environments – UCM 4.0

-40°– 150°F (-40°–65.6°C), 10% to 90%relative humidity, non-condensingMounting

Typically, the UCM 4.0 is factoryinstalled. However, UCM 4.0 is availablewith retrofit kits, in which case it mustbe field installed.See Chapter 8 for wireless systemmounting.

Tracer Summit and UCM 4.0Communications Link Wiring

Communications Link wiring must be18 AWG twisted shielded pair wire.Each conductor must be strandedtinned copper. The maximum total wirelength is 5,000 feet (1,524 m). Refer toChapters 2 and 3 for further informationabout wire selection.

UCM 4.0 Enhancements� The enhanced VAV UCM is backward

compatible with VariTrane® D VAVboxes (VXXD and VXXE) VariTrac®

dampers, and VariTrac II dampers.

�UCM 4.0 adds support for operationwith VariTrane Series F valves (¼-turnblade dampers) via 90-second drivetime.

�UCM 4.0 adds a second, CO2interfacing, mode of operation to theauxiliary analog input (TB3-5). This is a 1to 10 volt DC input with a mapping ofinput voltage to CO2 output data valueof 200 parts per million (PPM) of CO2per volt. The use of this new auxiliaryanalog input as an interface to a CO2detector is mutually exclusive with theuse of the input as auxiliarytemperature input. Therefore, the use ofthe C02 interfacing mode of operation isnot recommended for stand-aloneapplications requiring auto-changeover.

�UCM 4.0 adds a binary 24 VAC, drycontact input. It can be configuredeither as a generic input or as anoccupancy detector input.

�UCM 4.0 adds a VariTrac BypassDamper mode of operation. In this

GeneralInformation

CHAPTER 1: GENERAL INFORMATION

VAV-SVX01B-EN 5

mode, supply air temperature andsupply air pressure is made availableon the Com 4 link. The damper positionis a COM 4-control parameter. A Com 4configurable failsafe position wasadded. The supply air temperature usesa new “s” input (TB3-7). The use of thisnew input is mutually exclusive with theZone temp input (TB3-1).�UCM 4.0 now assumes the hot water

valve is closed after reset. This preventsa reset during hot water override fromcausing the valve to stop moving. Thisalso changes the behavior after reset,when there is a reheat demand, the hotwater valve now opens (from assumedclosed position) to the desired reheatposition.� In a wireless system, the hard-wired

sensor can now be configured as notpresent. The hard-wired sensor failureswill not be reported as long as at leastone wireless zone sensor is reportingvalid temperature values.� For standalone units, series or parallel

fan operation will use the unoccupiedfan control when the local unoccupiedrequest (** function) is received. InUCM 3.3 and prior, the fan wouldoperate as if occupied during localunoccupied request�UCM 4.0 adds a local minimum heating

flow set point. The use of and value ofthis set point is configurable.UCM 4.0 Backward Compatibility

UCM 4.0 can be used to replace UCM I,UCM II, and UCM III with no compatibil-ity issues. However, if the communicat-ing device (i.e. Command Unit I orComfort Manager™ I) is a COM 3device (1992 or earlier), then you willneed an upgrade chip. The ComfortManager chip upgrade is Kit 1511 andthe Command Unit chip upgrade is Kit1512.

UCM 4.0 FeaturesHeat and Fan Outputs

All fan outputs are rated for 10 VA each.Magnetic contactors are rated for 10VA. Mercury contactors are rated for 12VA.Wiring Diagram

Figure 1 shows a typical wiring diagramfor the redesigned UCM hardware. Thenew service part number is BRD 2087.

Figure 1. UCM 4.0 Board Layout

GeneralInformation

Zone Sensor, Auxiliary Sensor, andThumbwheel Set Point Calibration

If there is a discrepancy between ameasured temperature and what theUCM reports, a calibration offset valuecan be edited in the UCM setup screento correct the displayed value.Flow Sensor Calibration

If there is a discrepancy between ameasured flow and what the UCMreports, the measured value can beentered, which automatically calculatesa calibration multiplier to correct thedisplayed value.Water Valve Override

Each UCM that has proportional orstaged hot water heat outputs can beedited to override the water valve to itsmaximum position.Ventilation Set Points and RatioCalculation

Set point values needed for a space tosatisfy indoor air quality requirementsare provided. A resultant ventilationratio can be used to calculate an airhandler’s outside air damper minimumposition or other control strategies.Water Heat Output Configuration

UCMs that have hot water heat outputscan be configured for normally open ornormally closed.Zone Sensor Functions

Zone sensor functions now include: airvalve drive to maximum, use unoccu-pied set points, timed override, andcancel timed override.

Slaving of Zone Sensors

Up to three (3) UCM 4.0s may beconnected to a single zone sensor.Generic UCM Capability

UCM 4.0 can be configured to controlnon-Trane VAV boxes.

ShippingEach VAV product and its serviceliterature are shipped in the samepackage. When unpacking, make surethat the literature is not lost or dis-carded with the packing material.Visually inspect the individual compo-nents for obvious defects or damage.All components are thoroughlyinspected before leaving the factory.Any claims for damage incurred duringshipment must be filed with the carrier.

StorageWhen any component of the VAVsystem and/or field installed accesso-ries must be stored for a period of timeprior to being installed, they must beprotected from the elements. Thestorage location temperature should bebetween -40° – 150°F (-40°– 65.6°C) andthe relative humidity should be 10% to90%, non-condensing.The warranty will not cover damage tothe VAV system or controls due tonegligence during storage. A controlledindoor environment must be used forstorage.

6 VAV-SVX01B-EN

Chapter Overview

This chapter contains informationpertaining to the following:� Pre-power up check-out for the UCM

4.0

�UCM operational LEDs

� Zone Sensor check-out

UCM 4.0 Pre-PowerCheck-out

[ ]Check the supply voltage at TB1. Properpolarity must be maintained. TB1-1 isthe hot side (+) and TB1-2 is the groundside (-) of the 24 VAC input. The UCMcannot be powered from a common 24VAC transformer that is supplyingpower to a device containing a full-wave rectifier bridge in its powersupply. The acceptable voltage is 20 to28 VAC (24 VAC cataloged). However,voltages at either extreme may result inincreased system instability.

[ ]Verify that communications wiring hasproperly been terminated atTB2-1 (+)and TB2-2 (-). Polarity is very importanton the communications link.

[ ]Verify that the zone sensor connectionsare correct as detailed in the UCMwiring chapter.

[ ]Verify that the proper unit DIP switchsettings have been set on each UCM.

[ ]Verify that the tubing is properlyconnected to the transducer.

Light Emitting Diode (LED)OperationsThe UCM has one green LED locatednear TB3 and one yellow LED locatednear TB2 on the UCM circuit board. TheseLED’s are used to help diagnose commu-nication (yellow) or circuit board prob-lems (green).The green LED (red on older boards) is apower indicator. It is steady on when thepower is on and the software isfunctioning correctly. If it blinks with a 1second on 1 second off cycle whenpower is applied, then the board is notfunctioning and must be replaced.

Table 1 - Green LED Power Function IndicationLED State Indication

“On” Board functioning correctlyBlinking Board malfunction (Replace Board)“Off” Board does not have power

The yellow LED functions as thecommunication indicator. The indicationfrom the yellow LED is as follows:

Table 2 – Yellow LED Communication IndicatorFunctionLED State Indication

“On” Incorrect (reversed)communication polarity, noconnection, or shorted lines.

Blinking slowly Communication is occurring on theapprox. 1 link but not for that particular UCM.blink/sec.Blinking quickly Communication is occurring on the(multiple blinks link, specifically with that UCM.blinks/sec.“Off” Polarity is correct and no

communication is occurring on thelink

VAV Start-Up/Check-Out Procedure

Zone Sensor Check-outIf an erroneous temperature is beingreported to the UCM, use the ZoneSensor Temperature-Resistance Table toverify the integrity of the adjustable setpoint potentiometer or sensor. Theresistance should be measured acrossthe terminals to which the device isconnected.

Note: Disconnect the zone sensor fromthe UCM when making the checks listedin the table below.

Table 3 – Zone Sensor Temperature-ResistanceTable

ThermostatThumbwheel Sensor

Temp. Resistance Resistance(°F) (Ohms) (k Ohms)

55 792 17.056 772 16.557 753 16.158 733 15.759 714 15.460 694 15.061 675 14.662 656 14.363 636 14.064 617 13.665 597 13.366 578 13.067 558 12.668 539 12.369 519 12.170 500 11.871 481 11.572 461 11.273 442 11.074 422 10.775 403 10.476 383 10.277 364 10.078 344 9.779 325 9.580 306 9.381 286 9.082 267 8.883 247 8.684 228 8.485 208 8.2

Note: Thumbwheel resistance checksare made at terminal 2 and 3 on the zonesensor. Temperature sensor resistance ismeasured at terminal 1 and 2 of the zonesensor.

CHAPTER 2: VAV START-UP/CHECK-OUT PROCEDURE

VAV-SVX01B-EN 7

UCM 4.0 Installationand Wiring

Figure 2. Wiring Diagram for Single Duct Units with Field Installed Re-heat

Figures 2 – 5 show wiring diagrams for typical applications of UCM 4.0

CHAPTER 3: UCM 4.0 INSTALLATION AND WIRING

8 VAV-SVX01B-EN


Figure 3. Wiring Diagram for Single Duct Units with Factory Installed Electric Re-heat

VAV-SVX01B-EN 9


Figure 4. Wiring Diagram for Fan-Powered Units with Field Installed Re-heat

10 VAV-SVX01B-EN


Figure 5. Wiring Diagram for Fan-Powered Units with Factory Installed Electric Re-heat

VAV-SVX01B-EN 11

Chapter Overview

This chapter contains informationabout the following:

�UCM 4.0 Power Wiring

� Zone Sensor Wiring

� Communication Wiring

� DIP switch Settingsire Selection

UCM 4.0 Power Wiring

Power RequirementsCaution: Disconnect all power externalto the unit to prevent injury or deathfrom electrical shock. Use copperconductors only. The use of aluminumor other types of wire may result inoverheating and equipment damage.

Use at least 16 AWG for power wiringand connect to terminal TB1-1 (+) andTB1-2 (-). 24 VAC is required to powerthe UCM control and has an acceptablevoltage tolerance of 20 to 28 VAC.Replace the UCM control box coverafter field wiring to prevent anyelectromagnetic interference.

NOTE: A dedicated 24 VAC, 50VA NECclass 2 transformer is recommended topower the UCM. When poweringmultiple UCM’s from one transformer,polarity must be maintained. TerminalTB1-1 is designated positive (+) andterminal TB1-2 is negative (-) to the unitcasing ground. All wiring must complywith the National Electric Code (NEC)and local codes. Maximum wire lengthsshould be based on NEC specifications.

The power consumption for coolingonly Series F Models (VariTrac andVariTrane) is 12 VA (4 VA for the airvalve/actuator and 8 VA for the board).Units with fans and/or reheat outputsare rated at 10 VA maximum formagnetic contactors and 12 VAmaximum for mercury contactors foreach output. To determine the total UCMpower requirement, add the powerconsumption per stage to the circuitboard power requirement. For example,a Series F unit containing magneticcontactors with three stages of reheatwould consume 42 VA.

NOTE: VariTrane and VariTrac cooling onlySeries D and E models consume 20 VA(12 VA for the actuator and 8 VA for theboard). The heating output ratingsremain the same.

Refer to Figure 1 for UCM terminallocations.

Zone Sensor Wiring

Location and Mounting

A zone sensor in each control zoneshould be located in the most criticalarea of the zone. Sensors should not bemounted in direct sunlight or in thearea’s supply air stream. Subdivision ofthe zone may be necessary for ad-equate control and comfort.Avoid mounting zone sensors in areassubject to the following:

�Drafts or “dead spots” behind doors orcorners.

�Hot or cold air ducts.

� Radiant heat from the sun orappliances.

� Concealed pipes or chimneys.

�Unheated or uncooled surfaces behindthe sensor such as outside walls.

�Air flows from adjacent zones or otherunits.

Wiring

Each unit must be controlled by a zonesensor that is designated specificallyfor use with the UCM control. Fieldwiring for the zone sensors must meetthe following requirements:�Must be 14 to 18 AWG.

� Refer to the sensor instructions forterminal connections.

� If local codes require enclosedconductors, the zone sensor wiresshould be installed in conduit. Do notroute zone sensor wires in conduit with24 VAC or other high power conductingwires.

Multiple UCM’s Per Zone Sensor

Up to three (3) UCM’s may be con-nected to a single zone sensor andthumbwheel set point.� Connect terminal connections TB3-1,

TB3-2, and TB3-3 in parallel (i.e. daisychain) from the master UCM to theslaved UCM(s). NOTE: Proper polaritymust be maintained.

� Cut jumper wires W1 and W2 on theslaved UCM’s (never cut jumper wiresW1 and W2 on the master UCM).


12 VAV-SVX01B-EN

Multiple UCM’s per Auxiliary DuctTemperature Sensor

Up to three (3) UCMs may be con-nected to a single auxiliary ducttemperature sensor.� Connect terminal connections TB3-5

and TB3-6 in parallel (i.e. daisy chain)from the master UCM to the slavedUCM(s). NOTE: Proper polarity must bemaintained.

� Cut jumper wire W4 on the slavedUCMs (never cut jumper wire W4 onthe master UCM).

Zone Sensor Options

Depending on the zone sensor optionsused, a maximum of five wires may berequired to run from the UCM to thezone sensor. The zone sensor optionsare:� Zone sensor only (2 wires) – Part

Number X13510609-01.

� Zone sensor with external adjustableset point and communications jack (5wires) – Part Number X13510606-01.

� Zone sensor with external adjustablenight set back, timed override (TOV) on/cancel button, and communicationsjack (5 wires) – Part NumberX13510606-02.

� Sensor with night set back, timedoverride (TOV) on/cancel button, andcommunications jack (4 wires) – PartNumber X13510606-03.

� Digital zone sensor - Part NumberX13511067-01

NOTE: All wiring from the zone sensor tothe Com link must be twisted shieldedpair wiring.

Communication Wiring

Communication Link Wiring

The “Communication Link” is thecommunication wiring between TracerSummit and all VAV box Unit ControlModules (UCM). Tracer Summit® canbe connected to the UCM communica-tion link in a “daisy chain” configura-tion.

Note: It is not necessary for each UCMto be connected to the line in sequentialorder by address. Also, multiplecommunication links may be run andterminated at the Tracer Summit.However, a consistent, documentedwiring path will help troubleshootcommunication problems afterinstallation.

Field wiring for the communicationlink must meet the followingrequirements:

1.All wiring must be in accordance withthe National Electrical code and localcodes.

2.Communication link wiring must be atleast 18 AWG twisted shielded pairwire. Shields must be grounded at theTracer Summit or Central ControlPanel (CCP) only. More than oneground reference will causecommunications failures. Shieldsmust be daisy chained. Tape the shieldat the last VAV UCM to prevent anyconnection between the shield andground. Wire specifications are asfollows:

Plenum Cable

Stranded, tinned copper insulatedwith extruded FEP. Conductors cabledand shielded with overall aluminum/Mylar tape and stranded, tinnedcopper drawn wire. Extruded jacket,300 volt, 150°C NEC 725-2 (b) class 2,type CL2P, 25 pF/ft.Non-Plenum Cable

Stranded tinned copper insulated withpolyethylene. Conductors cabled andshielded with overall aluminum/polyester tape and stranded, tinnedcopper drain wire. Chrome gray PVCjacket, 300 volt, 60°C NEC type CM, 24pF/ft.

Wire Capacitance

Wire capacitance must comply with thefollowing table:

Max. Communication Max.Link Wiring Length Wire Capacitance

1,000 feet (304.8m) Up to 60 pF/ft. (196.9 pF/m)2,000 feet (609.6 m) Up to 50 pF/ft. (164.0 pF/m)3,000 feet (914.4m) Up to 40 pF/ft. (131.2 pF/m)

4,000 feet (1,219.2 m) Up to 30 pF/ft. (98.4 pF/m)5,000 feet (1,524 m) Up to 25 pF/ft. (82.0 pF/m)

3.The maximum wire length should notexceed 5,000 feet (1,524 m).

4.Communication link wiring cannot passbetween buildings.

5.A maximum of 63 UCMs can beconnected to each COM Link. Daisychaining is a typical configuration.“STAR” chaining is also acceptable.

Note: Polarity is extremely importantand must be observed on communica-tion link connections.

6.At the VAV box, communication linkwires must be connected to TB2-1, 3 (+)and TB2-2, 4 (-) terminals on the UCM.

7. Verify that the UCM address is properlyset (DIP switch SW1). See Table 4 forproper DIP switch settings.


VAV-SVX01B-EN 13

DIP Switch SettingsDIP Switch SW1 contains six switchesfor addressing the UCM. Theseswitches allow a user to set a uniquecommunication address for each UCM.Each UCM on a given communicationlink must have a unique address inorder for Tracer Summit or the CCP tocommunicate to it. Refer to Table 3 forUCM 4.0 DIP switch settings.

Note: When using Eware to communi-cate to the UCM, you must add 64 to theDIP switch address. For example, a UCMwith the DIP switch address set to 1would be UCM Number 65 in Eware.


Table 4 – DIP Switch Settings for UCM 4.0UCM EwareUnit # Address Dip 1 Dip 2 Dip 3 Dip 4 Dip 5 Dip 6

1 65 OFF ON ON ON ON ON2 66 ON OFF ON ON ON ON3 67 OFF OFF ON ON ON ON4 68 ON ON OFF ON ON ON5 69 OFF ON OFF ON ON ON6 70 ON OFF OFF ON ON ON7 71 OFF OFF OFF ON ON ON8 72 ON ON ON OFF ON ON9 73 OFF ON ON OFF ON ON10 74 ON OFF ON OFF ON ON11 75 OFF OFF ON OFF ON ON12 76 ON ON OFF OFF ON ON13 77 OFF ON OFF OFF ON ON14 78 ON OFF OFF OFF ON ON15 79 OFF OFF OFF OFF ON ON16 80 ON ON ON ON OFF ON17 81 OFF ON ON ON OFF ON18 82 ON OFF ON ON OFF ON19 83 OFF OFF ON ON OFF ON20 84 ON ON OFF ON OFF ON21 85 OFF ON OFF ON OFF ON22 86 ON OFF OFF ON OFF ON23 87 OFF OFF OFF ON OFF ON24 88 ON ON ON OFF OFF ON25 89 OFF ON ON OFF OFF ON26 90 ON OFF ON OFF OFF ON27 91 OFF OFF ON OFF OFF ON28 92 ON ON OFF OFF OFF ON29 93 OFF ON OFF OFF OFF ON30 94 ON OFF OFF OFF OFF ON31 95 OFF OFF OFF OFF OFF ON32 96 ON ON ON ON ON OFF33 97 OFF ON ON ON ON OFF34 98 ON OFF ON ON ON OFF35 99 OFF OFF ON ON ON OFF36 100 ON ON OFF ON ON OFF37 101 OFF ON OFF ON ON OFF38 102 ON OFF OFF ON ON OFF39 103 OFF OFF OFF ON ON OFF40 104 ON ON ON OFF ON OFF41 105 OFF ON ON OFF ON OFF42 106 ON OFF ON OFF ON OFF43 107 OFF OFF ON OFF ON OFF44 108 ON ON OFF OFF ON OFF45 109 OFF ON OFF OFF ON OFF46 110 ON OFF OFF OFF ON OFF47 111 OFF OFF OFF OFF ON OFF48 112 ON ON ON ON OFF OFF49 113 OFF ON ON ON OFF OFF50 114 ON OFF ON ON OFF OFF51 115 OFF OFF ON ON OFF OFF52 116 ON ON OFF ON OFF OFF53 117 OFF ON OFF ON OFF OFF54 118 ON OFF OFF ON OFF OFF55 119 OFF OFF OFF ON OFF OFF56 120 ON ON ON OFF OFF OFF57 121 OFF ON ON OFF OFF OFF58 122 ON OFF ON OFF OFF OFF59 123 OFF OFF ON OFF OFF OFF60 124 ON ON OFF OFF OFF OFF61 125 OFF ON OFF OFF OFF OFF62 126 ON OFF OFF OFF OFF OFF63 127 OFF OFF OFF OFF OFF OFF

14 VAV-SVX01B-EN

Chapter Overview

This chapter contains informationabout the following:� Typical UCM Operating Behavior

�UCM Status

�UCM Set Points

�UCM Setup

Typical UCM OperatingBehavior

VariTrac Bypass Damper Mode ofoperation

In the VariTrac Bypass Damper mode ofoperation, the decisions of damperposition are made by a higher-levelsystem controller, e.g., the VariTrac 4.0Central Control Panel (CCP). TheVariTrac bypass mode supports thereporting of supply air temperature(SAT), supply air static pressure (SAP),and supply air CO2 concentration(CO2). This mode supports the follow-ing:� Control of damper position from the

higher-level system controller.

� The control of the damper to a failsafebypass position upon lack ofcommunication to the VAV UCM for aperiod of one minute.

�Damper calibration from the fully openposition while the system fan is off.

�Upon power up, damper calibrationand then damper movement to itsfailsafe bypass position.

� By convention of the VariTrac 4.0system, DIP switch setting of 63 hasbeen reserved for the VariTrac BypassDamper. Note: DIP switch setting 63 canbe used for non-VariTrac systems.

Typical UCM Operating Behavior

VariTrane and VariTrac (zone damper,not bypass damper) Modes ofoperation

Unoccupied Mode:

Zone temperature is controlled to theunoccupied set points. If the AHUsystem fan is off the valve will beoperating in a pressure dependentmode.Normally the minimum flow set point isnot enforced. This allows the controlalgorithm to close the valve in responseto zone temperature and set points. Ifthe minimum flow set points are beingenforced the valve will position itself ata percentage equivalent to theminimum flow set point.

Morning Warm Up:

Tracer Summit places the UCM in heatmode and drives the UCM to maximumflow. The AHU system fan is turned onand the UCM operates in pressureindependent mode and controls theairflow to the maximum flow set point.NOTE: VariTrac units always operate inpressure dependent mode.Morning Cool Down:

Tracer Summit places the UCM intocool mode and drives the UCM tomaximum flow. The AHU system fan isturned on and the UCM operates inpressure independent mode andcontrols the airflow to the maximumflow set point. NOTE: VariTrac unitsalways operate in pressure dependentmode.Occupied:

Zone temperature is controlled to theoccupied set points. Set points aredetermined from the local thumbwheelif enabled.Cooling:

Zone temperature is controlled to thecooling set point. Both types of reheat(hot water and electric) are available ifneeded to keep the zone from coolingbelow the heating set point.Heating:

Zone temperature is controlled to theheating set point. Hot water reheat willalways be available if needed to keepthe zone from cooling below theheating set point. Electric reheat may bepermitted to turn on if using autochangeover and the supply air temp (orauxiliary temperature for stand-aloneunits) is not too high.The following table briefly describes thetypical behavior of various UCMconfigurations during normal operatingmodes.

UCM Programmingand Operation

CHAPTER 4: UCM PROGRAMMING & OPERATION

VAV-SVX01B-EN 15


The following table briefly describes the typical behavior of various UCM configurations during normal operating modes.

Unoccupied Transition to occupied OccupiedCooling Heating Morning Warm Up Morning Cool Down Cooling Heating

Single Control to cooling Control to heating Tracer may place Tracer may place Control to cooling Control to heatingDuct setpoint. setpoint. UCM in max flow and UCM in max flow setpoint. setpoint.

supplies hot air. and supplies coldControl to heating air. Control to

setpoint. cooling setpoint.Reheat All types of local Electric reheat is Electric reheat is All types of local All types of local Electric reheat is

reheat available to available if using auto available if using auto reheat available to reheat available to available if using autokeep zone above changeover and the changeover and the keep zone above keep zone above changeover and theheating setpoint. supply air temperature supply air temperature heating setpoint. eating setpoint. supply air temperature

(or auxiliary temperature) (or auxiliary temperature) (or auxiliary temperature)is below 70oF. Local is below 70oF. Local is below 70oF. Localhot water reheat is hot water reheat is hot water reheat isalways available to always available to always available to

keep the zone above keep the zone above keep the zone abovethe heating setpoint. the heating setpoint. the heating setpoint.

Fan Fan runs until valve Fan runs until valve Fan on. Fan on. Fan on. Fan on.Series is fully closed AND is fully closed AND

reheat is off. reheat is off.Fan Fan off unless local Fan off unless local Fan off unless local Fan off unless local Fan on if needed Fan on if neededParallel reheat is on. reheat is on. reheat is on. reheat is on. for heat. for heat.(temp.)Fan Fan off unless local Fan off unless local Fan off unless local Fan off unless local Fan on if needed Fan off unless localParallel reheat is on. reheat is on. reheat is on. reheat is on. for ventilation or reheat is on.(flow) reheat is on.

16 VAV-SVX01B-EN

Calibration of Flow Sensor and Positionof Valves (Air and Water)

Calibration that is initiated via a reset isstaggered to prevent duct over pressur-ization. The calibration process consistsof 2 steps:

1.Establishing the true valve position.

This is done by overdriving the valveclosed (open in the case when UCM4 isconfigured for VariTrac Bypass DamperMode of operation) for 30 secondsbeyond the configured stroke time (watervalve stroke time plus 15 seconds).

2.Adjusting the D/A output to correct anytransducer offset.

The D/A output is fed into an op ampalong with the signal from the transducerto remove any zero offset voltage fromthe pressure transducer.Communication Protocol Selection

UCM 4.0 can communicate using eitherCOM 3 or COM 4 protocols. The UCM willautomatically determine whether thefront-end system is a COM 3 or COM 4device.Adjustable Air Valve Stroke Times

Stroke times are adjustable for all unitsover the communication link as long asthe communication protocol used isCOM 4. If the UCM is in COM 3 mode, thestroke time is only configurable forgeneric and VariTrane Series F configura-tions. Stroke times for non-generic, non-series F COM 3 systems are hard codedinto the UCM for the following valves:Series F All sizes 90 secondsSeries D & E Sizes 3, 6, and 11 6 min. 24 sec.Series D & E Sizes 17, 24, 32, and 42 6 minutesVariTrac Round 57 secondsVariTrac Rectangular 60 secondsSeries C Sizes all but 20, 40 7 min. 12 sec.Series C Sizes 20, 40 9.25 min.

Timed Override (TOV) Button Functions

There are two buttons that the user canaccess. Pushing the timed overridebutton (on) in an unoccupied periodprovides two hours of occupied control.The UCM will switch into occupied modeand control to the occupied set points fortwo hours. The cancel button stops atimed override sequence and returns tounoccupied control. The UCM will revertback to unoccupied mode immediately.

Timed override (TOV) and cancelbuttons are recognized if they havebeen pushed for at least 0.5 secondsand no more than 15 seconds. Pushingthe buttons for longer than 15 secondswill simulate a zone temperature sensorfailure. The failure is non-latching andceases as soon as the button isreleased.

“*” And “**” Functions

Also in conjunction with thethumbwheel, the timed override buttoncan cause an override to maximumflow or unoccupied. The TOV buttonmust be pushed for at least 2 secondsand no more than 15 seconds with thethumbwheel in one of the overridepositions to recognize an overridecondition. With the thumbwheel in the“*” position an override to maximumflow is generated. With the thumbwheelin the “**” position an override tounoccupied is generated. The maxi-mum flow and unoccupied overridesare held until the thumbwheel is movedinto the normal operating region.

Note: If the thumbwheel is not enabled,locally generated overrides (“*” or “**”)are not possible.

Local Occupancy detector.

Local occupancy detection was addedwith UCM4 on input TB4-1. TB4-1 is a 24VAC input operated in a negative logicmode wherein the absence of signalindicates occupancy and the presenceof 24 VAC indicates non-occupancy. Theoccupancy detector’s interface is twodry relay contacts. Relay closure (shortbetween two dry relay contacts andpresence of 24 VAC at TB4-1) shallindicate unoccupancy. The VAV UCMhas a COM 4 configuration bit toindicate if the VAV UCM has an occu-pancy sensor connected.When configured for an occupancysensor and communications are active,an occupancy input state will bereflected by the UCM to an upper levelsystem controller. The upper levelsystem controller is responsible forcausing any system changes necessaryto provide occupied control.

When configured for an occupancysensor and communications are not

active and occupancy is detected, theUCM shall transition to the occupiedmode of operation. Upon loss of theoccupancy indication from theoccupancy detector, the VAV UCM willrevert back to unoccupied mode.

When configured for an occupancysensor and communications are active,loss of COM 4 communications doesnot result in the VAV UCM defaulting tooccupied mode.

When configured as a generic inputand communications are active anoccupancy input state will be reflectedby the UCM to an upper level systemcontroller. The upper level systemcontroller shall be responsible forcausing any system changes necessaryto provide occupied control. Whenconfigured for generic mode, loss ofCOM 4 communications will result inthe UCM defaulting back into occupiedmode.

Reheat Control

Reheat operation is allowed providedthe following conditions are satisfied:

1.The unit is not calibrating.

2.Flow overrides (open or closed) are notin affect.

3.Reheat lockout is not enabled.

4.If maximum flow override or fanlockout is present then parallel fan withany electric heat is not allowed.

5.If the zone temperature sensor hasfailed cold (open), reheat is not allowed.

6.While in the heat mode only hot waterheat can be used. If using autochangeover, UCM 3.3 and later willenable electric heat in the heat mode ifthe auxiliary temperature is less thanthe electric heat on set point and willdisable electric heat when the auxiliaryair temperature is greater than theelectric heat off set point.

Modulating Hot Water Reheat

When the zone temperature reaches theheating set point + 0.5°F the reheat isturned completely off. The modulatinghot water valve is over driven closed(by 15 seconds) any time reheat is nolonger required.


VAV-SVX01B-EN 17

Pulse Width Modulation (PWM)

Pulse Width Modulation (PWM)modulates 2 stages 0 to 100% with a 3-minute time base. The first stage (J9) ofPWM modulates 0 to 100% to supply 0to 50% of the reheat need. The secondstage (J10) modulates 0 to 100% tosupply 51% to 100% of the reheat need.Hot Water Heat Maximum Override(Maximum Heat Required)

A UCM with hot water outputs can becommanded to override the water valveposition to maximum position. Forunits with 1 - 3 stages hot water willturn on all of its water outputs (possiblefan is not affected). For units withproportional hot water the hot watervalve will be driven open, and if no fanis present, output 3 (J11) will energize.The hot water override can be com-manded via communications and canbe used to assist in water balancing.See Chapter 7 for Water BalancingProcedure.Auto Changeover

Auto changeover is based on zonetemperature and the supply air tem-perature as communicated or mea-sured by the auxiliary temperaturesensor.

1.When the supply air temperature is 10degrees above the zone temperaturethe control action will be Heat.

2.When the supply air temperature isbelow or equal to the zone temperaturethe control action will be Cool.

3.If the supply air temperature is betweenthe zone temperature and the zonetemperature +10oF (zone temperature <supply air temperature < zonetemperature + 10oF), the control actionremains the same and the UCMcontrols to the minimum flow set point.

Flow Overrides

During flow overrides of drive tominimum or maximum the flow iscontrolled to the appropriate set point.With UCM 3.3 and prior during flowoverrides of open or closed, the valve iscontinuously driven in that directionforever. UCM 3.3 and prior rely on thelimit switches to protect the drive train.UCM 4.0 drives for the stroke time, thenstops.

Enforce Minimum Flow Set Points

The UCM can be told not to enforce theminimum flow set point (energy saver)via communications. This allows thecontrol algorithm to choose any valuefrom 0 to the maximum flow set point.The primary use of this is VariTracsystems, but it is available for anyconfiguration.Calculated Cool Ventilation Ratio (ZFactor)

As a measurement of zone ventilation,a “Z” factor is computed and availableover communications (only if using theCOM 4 protocol). The UCM does notuse this value for any control purposes.It is computed as follows:Z = (Ventilation Target)/Sensed Flow

Where the ventilation target isdependent on occupancy and rangesfrom 0 to 100.

Z will be set to zero if the activeminimum flow set point is 0.

Z will be set to zero if the sensed flow(or valve position) is 0.

If position control is being used thesensed flow is replaced with the valveposition.

The Z factor may then be used by BASequipment to satisfy ASHRAE 62-89and calculate the outside air flow setpoint.

IAQ Set Point Modification

Ventilation rate change for IAQ pur-poses is accomplished by setting theactive minimum flow set point to theedited cooling minimum flow set point* IAQ multiplier when no heat is beingsupplied to the zone. When heat isbeing supplied (heat mode or reheatactive) the active minimum flow setpoint is the greater of heating minimumflow and cooling minimum flow * IAQmultiplier. The result of cooling mini-mum flow * IAQ multiplier is limited tothe maximum flow set point. Reheatcontinues to stage on/off based uponthe heating minimum flow set point.The IAQ multiplier range is from 0.0 to10.0 in tenths.Wireless Compatibility

Up to five wireless sensors may beassigned to a UCM. Four sensors maybe classed as “averaging”; one sensor

can be classed as “backup”. Thehardwired sensor is optional and canbe classified as:“Averaging” (A peer with the averagingwireless sensors)

“Primary Backup” (Supersedes anybackup wireless sensor)

“Secondary Backup” (Used only if thewireless backup sensor is notfunctional)

“Not Present” (UCM 4.0 only, UCM 3.3and prior treated this selection thesame as Secondary Backup)

The backup sensors are optional.Backup sensors for temperature andset point inputs only affect the UCM ifall averaging sensors are failed. Backupbutton functions are always used. Anycombination of backup strategies ispermitted.

Although the hardwired sensor isoptional in a wireless system, havingone provides valid set point and zonetemperature values for the UCM to useduring the time between a reset (powercycle or via communication) and thereception of the next wireless dataupdate. During this time, if there is nohardwired sensor the zone temperatureused by the UCM is 0oF and the globaland hardwired set point and zonetemperature will be indicated as failed.In a wireless system with a hardwiredsensor enabled and configured asaveraging, primary backup orsecondary backup after a reset theUCM will use the hardwired sensorvalues until the wireless sensor valuesare received.

Button pushes from any sensorassigned to a UCM will be acceptedand used without regards to source,(i.e., any assigned sensor can causeany button function). The priority ofbutton pushes is: 1. Override tomaximum flow, 2. Override tounoccupied, 3. Timed override, and 4.Cancel. Any sensor that is generating alocal override will not be used tocalculate the local thumbwheel setting.

The UCM must receive an update froma wireless sensor at least every 24minutes for that sensor to continue toaffect the zone control. Sensors that do


18 VAV-SVX01B-EN

not update at least every 24 minutes willbe viewed as failed.

Composite zone temperatures andthumbwheel settings are derived fromthe transmitted data and the hardwiredsensor if applicable. Data for the zonetemperature and thumbwheel valuecomes first from the averaging sensorsthen the primary backup, then thesecondary backup. Zone temperature isthe simple average of the availablesensors. The thumbwheel setting is theweighted average of the availablesensors.

zone temperature = (measuredtemperature + zone temperaturecorrection)/(Number of sensors)

thumbwheel setting = ((thumbwheelsetting + thumbwheelcorrection)*weighting factor))/(weightingfactor)

Flow (or Supply Pressure in the case ofbypass damper mode)

Each VAV valve contains a “flow ring.” Itis a multi-ported Pitot tube. The differen-tial flow transducer connects to the flowring. One side of the flow ring is exposedto the duct static pressure, the other isexposed to static and velocity pressure.The difference is velocity pressure. Byknowing the air velocity in the duct andthe size of the air valve, the air volumecan be calculated. See Chapter 7 for AirBalancing Procedures.

UCM STATUSThe status display does not contain anyeditable data. If Communications aredown (UCM NOT COMMUNICATING isshown), the rest of the status display willnot appear. Note: The following screenshots are taken from Trane EveryWare™Software (Eware). When communicatingwith a UCM 4.0 or greater via Eware,you must have Eware software revision1.35 or greater. The display will be similarwhen using a CCP. However, whencommunicating to VAV UCM usingTracer Summit, although the display willbe completely different, the variousfunctions of the UCM perform the same.Please reference the VariTrac OperatorsGuide or the Tracer Summit SystemProgramming Guide (BMTW-SVP01A-EN) for exact CCP and Summit (respec-tively) displays.

When viewed from the Eware, the UCM status display appears as follows:


Following are descriptions of each line on the UCM status screen.

Zone Temperature

This line displays the temperature as recorded by the zone sensor. If the zone sensorhas failed, this line will read FAIL.Active Cooling Set Point and Active Heating Set Point

These set points are the active (actual) cooling and heating set points currently usedby the UCM. If the zone sensor is enabled, the zone sensor set point will be used asthe Active Cooling set point during occupied mode.Control Mode

This line shows whether the UCM is in the occupied or unoccupied mode. Thecontrol mode determines which heating and cooling set points to use.Control Action

This line shows the heat or cool control action of the UCM. The cool control actionwill modulate the air valve as if the supply duct air is colder than the space tempera-ture. The heat control action will modulate the air valve opposite the cool controlaction (supply duct air is warmer than the space temperature).Flow

This line displays the unit’s airflow rate expressed in the flow units selected in thesetup menu. This line will not be shown if the UCM is using position control insteadof flow control. The UCM will use position control if the flow sensor is failed or notinstalled. The UCM will also use position control if the unit’s airflow rate is less than5% or greater than 110% of the unit’s cataloged CFM. For example, the UCM will useposition control for a size 600 CFM unit if the flow is less than 30 CFM (5%) or greaterthan 660 CFM (110%). NOTE: Although the UCM will read flow down to 5% ofcataloged and up to 110% of cataloged, the range of MIN FLOW settings is 0%, or10% to 100% of cataloged. The range of MAX FLOW settings is 100% of cataloged. Inthe example above, the lowest allowable MIN FLOW set point is 60 CFM (zero is alsopermissible) and 600 CFM is the highest allowable MAX FLOW set point.Flow Control

This line displays the actual flow control override of the UCM. These overrides can beAUTO, OPEN, CLOSED, MIN, and MAX.Position

This line displays the UCM’s air valve position.

VAV-SVX01B-EN 19

Present Minimum

If the UCM is using flow control, thisline will show the present minimumexpressed in the flow units selected inthe setup menu. If the UCM is usingposition control, the minimum will beexpressed as the percentage open.Ventilation Ratio

The ventilation ratio is equal to the“outside air requirement” divided bythe air valve flow. The UCM set pointsscreen provides entry for the occupiedand unoccupied outside air require-ment.Zone Sensor Set Point

This line will not be shown if the zonesensor thumbwheel functions havebeen edited to DISABLE on the UCMsetup menu nor on zone sensorswithout the thumbwheel.The following describes what may bedisplayed on this line:

� Zone sensor set point 70.1This text displays the current zonesensor set point.� Zone sensor set point MAX

This text will be displayed if “*” appearson the zone sensor thumbwheel andhas been overridden to MAX (“*”means the high limit and TOVpushbutton have been depressed).� Zone sensor set point UNOCC

This text will be displayed if “**”appears on the zone sensorthumbwheel and has been overriddento UNOCC (“**” means the low limitand TOV pushbutton have beendepressed).� Zone sensor set point FAIL

Displayed if no zone sensor module issupplying the UCM with a valid setpoint.Unit Type, Heat Type, and Fan Type

These lines show the different types ofunits, the type of heat and the type offan. Further descriptions of these typesare found under the UCM setupsection.

Auxiliary Temperature

The displayed value will reflect theauxiliary sensor temperature. This fieldwill not be shown if the unit does nothave an auxiliary sensor.Software Revision

This line shows the version of the UCMfirmware that is being used.The following lines will only appear ifthe condition exists:

UCM Memory Failure

This text will be displayed if the UCM’sEEPROM has failed.Calibrating

This will be displayed if the UCM iscalibrating. The UCM will calibrate aftera power-up or as commanded by anICS device.Control Offset Active

This line will be shown if the controloffset is currently being used. It willonly be shown if the edited occupiedset points are being used and thecontrol offset is active for the UCM.Max Hot Water Override

This line will be shown if Max hot wateroverride is edited to YES on the UCMsetup menu.

UCM SET POINTSIn Eware, the UCM set points displayappears as follows:


Following are descriptions of each lineon the UCM set points screen.

Active Cooling Set PointActive Heating Set Point

The set points cannot be edited andreflect the set points currently beingused for temperature control.Occupied Cooling Set PointOccupied Heating Set Point

Both set points have a range of 30.0°–100.0°F (-1.1° – 37.8°C). If a zone sensorthumbwheel set point is not beingused, these set points will be used asthe UCM’s active set points duringoccupied times. The cooling set pointmust be greater than or equal to theheating set point plus 2.0°F (1.1°C).

NOTE: Occupied cooling and heating setpoints must be set within the cooling setpoint high limit and the heating set pointlow limit in order to control to the properset points.

Unoccupied Cooling Set PointUnoccupied Heating Set Point

Both set points have a range of 30.0° –100.0°F (-1.1° – 37.8°C). These set pointsare used when the UCM is unoccupied.The unoccupied cooling set point mustbe greater than or equal to the unoccu-pied heating set point plus 2.0°F (1.1°C).

20 VAV-SVX01B-EN

NOTE: Unoccupied cooling and heatingset points must be set within the coolingset point high limit and the heating setpoint low limit in order to control to theproper set points.

Cooling Set Point Low LimitHeating Set Point High Limit

These limits apply to both occupied andunoccupied modes of operation. Bothlimits have a range of 30.0° – 100.0°F(-1.1° – 37.8°C). The set point limits willbe applied to the active set points bythe UCM but will not restrict operatorentry of set points.

NOTE: These limits are allowed to cross(i.e. the cooling set point low limit can begreater than, less than, or equal to theheating set point high limit).

The UCM will enforce these limitsregardless of the source of the activeset points.

Cooling Set Point High LimitHeating Set Point Low Limit

These limits apply to both occupied andunoccupied mode. Occupied andunoccupied cooling and heating setpoints are subject to high and lowlimits. The cooling set point high limitand the heating set point low limit“cap” your unoccupied set points,which directly impacts energy savings.The upper level device is responsiblefor preventing the resulting set pointsfrom being crossed. This may happen ifthe heating set point low limit is abovethe cooling set point high limit. Havingthe cooling set point high limit and theheating set point low limit set to thefactory defaults (cooling high limit =102°F, heating low limit = 43°F) shouldprevent them from impacting fieldoperation.

Heat Offset

The set point has a range of 2° – 10°F(1.1° – 5.6°C). When a zone sensorthumbwheel set point is being used, thecooling set point will equal the zonesensor thumbwheel set point and theheating set point will equal the zonesensor set point minus the ZoneSensor Heating Set Point Offset. Theoffset will always be displayed and willalways be editable even if a zone sensorset point is not being used.Control Offset Value

The Control Offset has a range of 0° –5°F (0° – 2.8°C). When Control Offset isactive, this value will be added to theedited occupied cooling set point andsubtracted from the edited occupiedheating set point to determine theactive set points.

Note: The control-offset value will noteffect a zone sensor thumbwheel setpoint.

Fan Control Set Point

The entry on this line determines whena parallel fan will be turned ON and OFF.If “Parallel fan control” has been editedto “DEG” the fan control offset will beentered as a temperature offset (2° –10°F) which will be added to the heatingset point. If “Parallel fan control” hasbeen edited to “FLOW” this line will beentered as a percent (0 to 100%) if theunit is a VariTrane unit. The entry field onthis line will appear as “—“ if the unitdoes not have a parallel fan. BP Failsafe Position

This setting only applies to VariTracBypass mode of operation. If the CCPstops communicating with the BypassDamper UCM for more than 60seconds, the UCM will drive to thefailsafe position.

BP Command Position

This setting only applies to VariTracBypass mode of operation. The CCPuses this parameter to set the properposition of the Bypass damper.Maximum Flow/Position

This range is 10% to 100% of the unit’scataloged CFM size. Cooling andheating flow can be edited to zero.Minimum Flow/Position

Although the UCM will read flow downto 5% of cataloged, the range of MINFLOW settings is 0%, or 10% to 100% ofcataloged.Min Heating Flow

The UCM will not drive its position/flowbelow this value under normal operat-ing conditions while in the HEAT mode(warm air in the supply duct) or while itis using local heat. The Min HeatingFlow value must be less than or equalto the Maximum Flow value. If the MinLocal Heat Flow is enabled, then theMin Local Heat Flow is used to deter-mine the minimum position/flowinstead of the Min Heating Flow whenlocal heat is on.Min Local Heat Flow

This input allows a separate heatingminimum flow set point to be used forlocal reheat. When local reheat is on,your active minimum flow can not beless than your minimum local heat flowset point.


VAV-SVX01B-EN 21

UCM SETUPIn Eware, the UCM SETUP display appears as follows:

The following are descriptions of each line on the UCM setup screen.

Unit Type

The possible Unit Types are, VariTrac Rectangular, VariTrane F Rectangular, VariTrane FRound, Bypass-Damper Rectangular, Bypass Damper Round, Generic, VariTrane D,VariTrac Round, and VariTrane C.Editing the unit type will affect the following:

� Heat type (defaults to NONE)

� Fan type (defaults to NONE)

�Unit size (defaults to the smallest unit size)

� Air Valve drive time

� Control algorithm gains (KP, reset times, valve flow constant) for air valve and watervalve.

Note: This means that the unit type should be edited before any of the items in the listare edited.

Heat Type

The heat type assignment identifies what kind of heat control algorithm is to be usedby the UCM. Possible selections include the following:�NONE – No heat available

� 1-3 stages electric

� Slow pulse width modulation – Electric (3 min. time base).

� Prop hot water and aux. output

� 1-3 stages hot water/perimeter

If the unit type is edited, the heat type will automatically be changed to NONE. If theheat type is edited or changed automatically, all 3 of the UCM outputs will be set toNormally Open and the “Max hot water override” will be canceled if it is active.


Fan Type

This entry identifies the fan type to becontrolled by the UCM (None, Series orParallel) and shows whether the unit’sfan has been enabled or disabled. Theenable/disable field on this line will notappear if the unit has a series fan andonly indicates if the parallel fan hasbeen disabled. The UCM may lockoutthe fan on its own if any of the followingapply: control action HEAT; flowoverride to drive OPEN, CLOSE, orMAX; or if the zone temperature sensorhas failed.

NOTE: This line will not appear if the unitdoes not have a fan.

BIP Configuration (Default is Generic)

The BIP Configuration interface is fordry relay contacts. There are two modesof operation available at TB4-1, GenericBIP and OCC Detector. In generic mode,the state of the input is only passed onfrom the UCM to Summit. CPL codemust be written in order for Summit toutilize any signal received from thisgeneric input. When configured as ageneric input and communications areactive, an occupancy input state will bereflected by the UCM to the upper levelsystem controller. The upper levelsystem controller shall be responsiblefor causing any system changesnecessary to provide occupied control.When configured for generic mode,loss of communications will result inthe UCM defaulting back into occupiedmode.In occupancy detector mode, theabsence of a 24 VAC signal at TB4-1indicates occupancy and the presenceof 24 VAC indicates non-occupancy.When configured for an occupancysensor and communications are active,an occupancy input state will bereflected by the UCM to an upper levelsystem controller. The upper levelsystem controller shall be responsiblefor causing any system changesnecessary to provide occupied control.When configured for an occupancysensor and communications are notactive and occupancy is detected, theUCM shall transition to the occupiedmode of operation. Upon loss of theoccupancy indication from the

22 VAV-SVX01B-EN

occupancy detector, the VAV UCM willrevert back to unoccupied mode.However, when configured for anoccupancy sensor andcommunications are active, loss ofcommunications does not result in theVAV UCM defaulting to occupied mode.

Unit Size

The unit size range is dependent on theunit type selected.Use Local Heat Set Point (Default is No)

When “No” is selected, the UCM willuse the Min Heating Flow. When “Yes”is selected, the UCM will use the MinLocal Heat Flow Set Point. See UCM setpoints for more information regardingMin Heating Flow and Min Local HeatFlow Set Points.Thumbwheel Set Point

If DISABLE is selected, the followingfeatures of the UCM’s zone sensorthumbwheel functions will be disabled:set point; ability to generate a “drive tomax” command; ability to generate a“go unoccupied” command.

Note: Disabling thumbwheel functionsdoes not disable the ON/Cancelpushbutton feature.

Aux Input Select (Defaults to Aux TmpSensor)

This entry determines the configurationof the A/CO2 input on terminal TB3-5 ofthe UCM. Selecting AUX TMP SENSORconfigures the input to use an auxiliarytemperature sensor. Selecting CO2Sensor configures the input to use aCO2 sensor.Parallel Fan Control

This entry will determine if a parallel fanwill be controlled based on zonetemperature or on flow conditions. If“Parallel fan control” has been edited to“DEG” the fan control offset will beentered as a temperature offset (2° –10°F) which will be added to the heatingset point. If “Parallel fan control” hasbeen edited to “FLOW” this line will beentered as a percent (0 to 100%) if theunit is a VariTrane unit. The entry field onthis line will appear as “—“ if the unitdoes not have a parallel fan.

Note: See the Sequence of Operationssection of this manual for details onparallel fan operation.

Auxiliary Temperature

The current auxiliary temperature willbe displayed on this line. If the auxiliarytemperature sensor has failed or is notpresent, “—“ will be displayed insteadof the temperature.Output “X” Normally

These lines will always be shown asNormally Open or Normally Closed, butcan only be edited if the heat type is “1-3stages hot water”. If the unit has a fan,output 3 will be set to Normally Openand will not be editable. If output 3 isnot controlling a fan, it is editable forproportional hot water units. If the unit’sheat type is changed, all of the outputswill be set Normally Open.Aux Temp Calibration

This line allows an auxiliary tempera-ture calibration offset to be entered witha range of -10.0°– 10.0°F (-5.6° – 5.6°C).The UCM will add the offset to the valuebeing read by the UCM’s auxiliarytemperature sensor. For example, if theauxiliary temperature sensor is indicat-ing that the temperature is 74°F (23.3°C),and the auxiliary temperature calibra-tion offset is -1.5°F (-0.8°C), the actualtemperature used by the UCM andreported to the ICS will be 72.5°F(22.5°C).Wired Zone Temperature

This is the temperature being reportedby the zone sensor. The temperaturewill be displayed with the temperaturecalibration offset applied. If the tem-perature sensor has failed or beendisabled, “—“ will be displayed insteadof the temperature.Wired Zone Temp Calib

The zone sensor calibration offset has arange of -10° – 10°F (-5.6° – 5.6°C). Thetemperature will be displayed with thetemperature calibration offset applied.The UCM will add the offset to the valuebeing read by the UCM’s zone tempera-ture sensor. For example, if the tem-perature sensor is indicating that thetemperature is 74.0°F (23.3°C) and thetemperature calibration offset is -1.5°F

(-0.8°C), the actual temperature used bythe UCM and reported to the ICS will be72.5°F (22.5°C).Max Hot Water Override

Entering YES for this line forces theUCM to turn on all of its hot wateroutputs or drive open its proportionalhot water valve. This may be useful forwater system balancing (see Chapter 7for water balancing information).Only units with the following heat typeswill be affected:

� 1-3 stages hot waterAll three of the heat outputs will beenergized. If the unit has a fan, output 3will not be affected.

� Proportional hot water and aux. outputThe hot water valve connected tooutputs 1 and 2 will be driven open.Output 3 will energize if it is notcontrolling a fan.The UCM will maintain the “Max hotwater override” condition over powerfailures. The only way to cancel a “Maxhot water override” is by editing thisline to NO.

If the unit does not have “1-3 stages hotwater” or “proportional hot water andaux. output”, “—“ will be displayedinstead of the ON/OFF descriptor.

Note: Unit heat must be enabled inorder for the Max hot water override tobe effective.

Wired Thumbwheel Set Point

This is the set point being reported bythe zone sensor. The set point will bedisplayed with the set point calibrationoffset applied. If the zone sensor hasfailed or been disabled, “—“ will bedisplayed instead of the set point.Flow Override

The flow override entered on this linehas the highest priority of all the flowoverrides (group, binary inputs, orupper level system functions). Possibleentries include AUTO, OPEN, CLOSED,MIN, and MAX. When a non-auto flowoverride is edited from the UCM level,the flow override will be maintainedover power failures. See Sequence ofOperations for more information.


VAV-SVX01B-EN 23

Wired Thumbwheel Calib

The thumbwheel calibration offset hasa range of -10° – 10°F (-5.6° – 5.6°C). Theset point will be displayed with the setpoint calibration offset applied. TheUCM will add the offset to the valuebeing read by the UCM’s thumbwheel.Cooling Flow CorrectPresent Cooling FlowMeasured Cooling Flow

This Present Cooling Flow shows thecurrent flow being reported by theUCM. If the Present Cooling Flow isincorrect, the operator can enter theMeasured Cooling Flow and theCooling Flow Correct calibration factorwill automatically be recalculated. Forexample, if a measured flow indicates330 CFM, and the UCM’s flow sensorreports 300 CFM, the measured flow(330) can be entered, which will calcu-late a calibration factor of 1.10. If theUCM is using position control, thecurrent flow reported by the UCMshould be 0 and any entry on the linewill generate an “Entry too large.” SeeChapter 7 for more information.

Wired Sensor Type

This line is used to edit the type oftemperature sensor being used. Thesensor type can be selected as eitherThermistor or RTD. Note: Factorysupplied sensors are Thermistors.

Wired Sensor Use

This input determines the function ofthe wired zone temperature sensor.Select Averaged to use the sensor aspart of a wired system OR to use thesensor as an averaging sensor in awireless system. Average will use thesensed temperature in the temperatureaveraging calculation and set pointtemperature will be averaged accordingto the set point vote. If this is the onlysensor the average will be the sensedtemperature. Backup means the UCMwill use this temperature only if theprimary sensor assigned to the UCMhas stopped communicating. Firstbackup means the UCM will look for awired sensor first if the wireless sensorfails. Second backup means the UCMwill look for a wireless backup sensorfirst if the wireless sensor fails. Selectnot used if no sensor is present or toignore the wired zone sensor.Wired Set Point Vote

Set point vote determines the weightingof the set point vote. The range is 0-9.This number represents the number ofvotes the sensor gets when the setpoints are averaged. If “0” is selectedthe sensor gets no vote.


24 VAV-SVX01B-EN

Chapter Overview

This chapter describes the sequence ofoperation of the available unit types.Unit operation during the availableoverride commands will also bedescribed. This chapter containssequence of operations pertaining tothe following:

� Single Duct Units

� Parallel Fan-Powered Units

� Series Fan-Powered Units

� Zone sensor functions

� Flow Sensor

� Failure Modes

Unoccupied

If the control mode is unoccupied(either as edited by software or asdetermined by the binary input), theunoccupied cooling and heatingtemperature set points are used fortemperature control. Heat outputsremain active.Heating

If the control action is edited to HEAT,the UCM controls the air valve as aheating source rather than cooling.Electric reheat is available the supply airtemperature (or auxiliary temperature)is below 70oF. Local hot water reheat isalways available to keep the zone abovethe heating set point. The “HeatingMinimum Flow Set Point” will set theminimum flow.Flow Control Override

Flow control may be overridden by anyof the following commands:�Drive Air Valve Fully Open

The air valve will be fully open and heatoutputs disabled.�Drive Air Valve Fully Closed

The air valve is driven fully closed andheat outputs disabled.�Drive Air Valve to Minimum Flow

The air valve is driven to the minimumairflow set point. The heat outputsremain operational.�Drive Air Valve to Maximum Flow

The air valve is driven to the maximumairflow set point. The heat outputsremain operational.Heat Control Override

Heat control can be disabled, lockingout heat outputs.Control Offset

Control offset may be enabled, whichadjusts the edited cooling and heatingset points.Recalibrate (Reset)

The recalibrate function can be enabled.If enabled, the unit will perform arecalibration.

Sequence OfOperations

Single Duct UnitsWhen the UCM control action is COOL,the UCM controls the modulation of theair valve as a cooling source to main-tain the “active cooling set point”.Airflow is varied between the minimumand maximum flow set points tomaintain temperature set points. A PIcontrol algorithm is utilized to minimizethe measured difference between theactive zone set point and the actualzone temperature.It is possible for units to utilize electricor hot water heating coils to maintaintemperature set points. After thetemperature loop calls for minimumcooling flow and the zone temperatureis at or below the heating set point,these units shall control to theirrespective “Minimum Heating Flow”.Once this “Minimum Heating Flow” isestablished, heat is allowed to operateaccording to the “Heat Control Type”specified for the controller. For electricheat units, this heating minimum flowset point must be at or above 20% ofthe unit cataloged airflow. Electric heatmay be pulse width modulation orstaged electric heat. Staging has thefollowing ON and OFF switch points.UCM 3.3 and later allow hot water toturn on regardless of flow/position.

Stage ON Switch point Off Switch point

1 At the heating 0.5°F above theset point heating set point

2 1°F below the 0.5°F below theheating set point heating set point

3 2°F below the 1.5°F below theheating set point heating set point

Hot water heat control may be eitherON/OFF or proportional. ON/OFF hotwater is activated on the same scheduleas staged of electric heat.

Utilization of the “Heating MinimumFlow” set point allows separateminimum flows to be active dependingon whether or not the unit heat isactive.

Override Conditions(Single Duct)The UCM occupied controls can beoverridden by the following overridecommands:

CHAPTER 5: SEQUENCE OF OPERATIONS

VAV-SVX01B-EN 25

Fan-Powered Units

Fan Actuation Schedule

FAN TYPE OCCUPIED UNOCCUPIED

Series ON OFF if valve closedAND reheat off

Parallel based on Cool mode: ON if zone temp Cool mode: OFF if zone OFF unless localTemperature <heating set point + fan temp > heating set point + reheat is on

offset fan offset + 0.5°F Heat mode: fan off unlessHeat mode: fan off unless reheat is onreheat is on

Parallel based Cool mode: ON if flow < fan Cool mode: OFF if flow > OFF unless localon Flow set point OR if flow < active fan set point + 5% AND reheat is on

minimum flow set point flow > active minimumHeat mode: fan off unless flow set pointreheat is on Heat mode: fan off unless

reheat is on

Heat stages are energized on thefollowing schedule:

Stage ON Switch point OFF Switchpoint

1 At the heating 0.5°F above theset point heat set point

2 1°F below the 0.5°F below theheat set point heat set point

Whenever the fan is energized, theprimary airflow is controlled at the“Heating Minimum Flow” set point.

Override Conditions(Parallel Fans)The UCM occupied controls can beoverridden by the following overridecommands:Unoccupied

If the control mode is unoccupied, theunoccupied cooling and heatingtemperature set points are used fortemperature control. Fan and heatoutputs are activated at the unoccupiedheating set point.Heating

If the control action is HEAT, the UCMcontrols the air valve as a heatingsource rather than cooling. Fan andheat outputs are disabled for parallelunits with electric heat. If the heat typeis hot water heat, then the fan willremain on if the heat is on during theheating control action.Flow Control Override

Flow control may be overridden by anyof the following commands:� Drive Air Valve Fully Open

The air valve will be driven fully open.Fan and heat outputs are disabled.

�Drive Air Valve Fully ClosedThe air valve is driven fully closed. Fanand heat outputs are disabled.�Drive Air Valve to Minimum Flow

The air valve is driven to the minimumairflow set point. The fan and heatoutputs remain operational.�Drive Air Valve to Maximum Flow

The air valve is driven to the maximumairflow set point. The fan and electricheat outputs are disabled (hot waterheat remains enabled).Heat Control Override

Heat control can be disabled, lockingout heat outputs.Fan Control Override

Fan control can be disabled, locking outboth fan and heat outputs. This affectsonly parallel fan-powered units.Control Offset

Control Offset may be enabled, whichadjusts the edited cooling and heatingset points.Recalibrate (Reset)

The recalibrate function can be enabled.

Series Fan-Powered Units

Occupied Units

Air valve control for series fan-poweredunits is the same as both single ductand parallel fan-powered units.During the occupied mode ofoperation, the series fan is continuouslyenergized. Heat stages are energized onthe following schedule:

Stage ON Switch point OFF Switch point

1 At the heating 0.5°F above theset point heating set point

2 1°F below the 0.5°F below the heatheat set point set point

Override Conditions(Series Fan)The UCM occupied controls can beoverridden by the following overridecommands:Unoccupied

If the control mode is edited to unoccu-pied, the unoccupied cooling andheating temperature set points are usedfor temperature control. The series fanand heat outputs will be activated as


Parallel Fan-Powered Units

Occupied Units

Air valve control for parallel fan-powered units is the same as for singleduct units.The first heat output is utilized tocontrol the fan. The remaining outputsare utilized to control heat. Fanenergization is a function of the“Parallel Fan Control Offset”. Theparallel fan control can be specified asan offset temperature in degrees abovethe heating set point or as a flow offsetin CFM. The fan will be energized abovethe fan control offset if reheat isrequired.

Note: The fan control offset is entered inCFM when used on a VariTrane unit.

If the fan control is based on flow, theunit fan will be energized wheneverprimary airflow is below this set point.For this parallel fan configuration, thefan control point, if specified in apercentage of unit airflow, must be setbetween 15% and 30% of the unitscataloged airflow to assure properoperation. A differential of 5% exists toavoid excessive fan cycling.When the fan control offset is in termsof a temperature above the heating setpoint, the fan shall be energizedwhenever the zone temperature isbelow the heating set point plus the fancontrol offset. A differential of 0.5°Fshall apply to this switch over to avoidfan cycling.

26 VAV-SVX01B-EN


and ON (TOV) button can initiate thesecommands.Notes:

� The UCM will not send thesecommands if “Zone sensorthumbwheel functions” is edited toDISABLE on the UCM setup screen.

�When an ICS is connected to the UCM,the UCM will pass the commands tothe ICS without taking any controlaction of its own. Since this is true, itmay take a minute or so after thecommand is initiated before the UCMactually goes unoccupied or is driven tomaximum.

� The UCM will not generate a TOV signalwhen a Drive Max or Unoccupiedcommand is initiated.

� Pressing the ON button will not affectthe zone temperature reported from theUCM.

� The UCM will remain in the Drive Maxor Unoccupied status over powerfailures IF “*” or “**” (respectively)have been initiated prior to the powerfailure.

Note: TOV pushbuttons should bepressed for at least 2 seconds and notmore than 15 seconds.

Flow SensorThe flow control is pressure indepen-dent utilizing the VariTrane flow-sensingring. The flow ring provides one of themost accurate differential pressure flowmeasurements in the industry byaveraging pressure differentials across16 sensing points. These sensingpoints, arranged in a ring configurationto compensate for various inlet ductconfigurations, provide a signalaccurate to within +/-5% of catalogedCFM provided there is 1½-inlet diam-eters of straight ductwork upstream ofthe VAV box.The pressure differential signal fromthe flow ring is then converted to anelectrical signal, which is utilized in thecontrol algorithm of the unit controller.It is recommended that the recalibratesequence be initiated on a weekly basis.Assuming ½ inlet diameters of straightduct work and proper systemrecalibration, total system flow

The zone sensor has the followingoptions:Zone Temperature

Each zone sensor module includes azone temperature sensor.Set Point

A UCM will only use the zone sensorthumbwheel set point (during occupiedtime) if “Zone sensor thumbwheelfunctions” is edited to ENABLE on theUCM setup screen.ON Timed Override (TOV) and CANCELTimed Override (TOV)

The ON (TOV) and CANCEL (TOV)commands can be issued by pressingthe ON or CANCEL buttons on any ofthe UCM zone sensor modules.�When an ON button on a zone sensor

is pressed (shorting the zonetemperature sensor circuit), the UCMwill set a TOV signal, clear the TOVcancel signal if it is set, and start thetwo hour timed override timer. The TOVsignal will be maintained for twominutes.

�When a CANCEL button on a zonesensor module is pressed for at leasttwo seconds, the UCM must set a TOVcancel signal, clear the TOV signal if it isset, and set the timed override timer tozero.

� Pressing any zone sensor module’s ONor CANCEL button will not affect thezone temperature reported from theUCM.

Note: TOV pushbuttons should bepressed for at least 2 seconds and notmore than 15 seconds.

Drive to Max and Go Unoccupied

When a zone sensor thumbwheel isturned to its high-end limit, indicated bya “*” on the thumbwheel, and the ONbutton is pressed, the UCM will initiatea “Drive to Max” command. When azone sensor thumbwheel is turned toits low limit, indicated by a “**” on thethumbwheel, and the ON button ispressed, the UCM will initiate a “GoUNOCCUPIED” command. The UCMwill maintain the command until thezone sensor set point is adjusted towithin the range of 50° to 85°. Any zonesensor module that has a thumbwheel

necessary to maintain the currentunoccupied set points. The fan controlpoint is not utilized on series units. Onelectric heating and hot water heatingunits, the fan and heat are energized atthe unoccupied heating set point. Theminimum cooling flow set point is resetto zero unless minimums are beingenforced by a group override. A seriesfan will be energized anytime the airvalve’s position is greater than 0%.Heating

If the control action is edited to HEAT,the UCM controls the air valve as aheating source rather than cooling. Theunit fan remains operational. Unit heaton an electric heat unit is locked out,but remains active on hot water units.Flow Control Override

Flow control may be overridden by anyof the following commands:� Drive Air Valve Fully Open

The air valve will be driven fully open.Fan operation is unaffected, but heatoutputs are locked out.� Drive Air Valve Fully Closed

The air valve is driven fully closed. Thefan and heat outputs are locked out.� Drive Air Valve to Minimum Flow

The air valve is driven to the minimumairflow set point. The fan and heatoutputs remain operational.�Drive Air Valve to Maximum Flow

The air valve is driven to maximumairflow set point. The fan and heatoutputs remain operational.Heat Control Override

Heat control can be disabled lockingout heat outputs.Fan Control Override

Fan control override does not affect fanoperation on series fan-powered units.Control Offset

Control offset may be enabled whichadjusts the edited cooling and heatingset points.Recalibrate (Reset)

The recalibrate function can be enabled.

Zone Sensor FunctionsThe zone sensor utilizes a thermistorelement to measure zone temperature.

VAV-SVX01B-EN 27

measurement accuracy (flow ring,transducer, and UCM controller) duringthe occupied mode should be +/- 8% ofcataloged airflow over the typicaloperating range of 20% to 100% of unitcataloged airflow.

Failure ModesEach UCM has diagnostic capabilities,which allow it to sense various failureconditions. This diagnostic capabilityaids in maintenance and troubleshooting of the system. Along withreporting these failure conditions, theUCM will follow a pre-programmedoperating sequence designed tomaintain zone comfort during a failure.The failure conditions and backupoperating sequences are explainedbelow.Temperature Sensor Failure

Failure of a zone temperature sensor(open or below low limit of 0°F (-17.8°C))will cause fan and heat outputs to bedisabled and airflow to be controlled tothe minimum cooling flow set point. Ifthe measured temperature fails abovethe high limit (short or above 100°F(37.8°C)), the airflow shall be controlledto the maximum flow set point.Flow Sensor Failure

If a flow sensor failure is reported(open, short, fails calibration, or is outof the normal range of 5% to 110% ofbox cataloged), the UCM will immedi-ately revert to a position-based,pressure dependent control algorithm.This allows full operation of the unitand maintains the ability to control thezone temperature. If a flow sensor hasfailed, it is periodically checked forproper operation. If found to beoperating properly, the UCM will beswitched to the standard pressureindependent control. Otherwise,position control is used as long as theflow signal remains out of range.Local Thermostat Set Point Failure

Failure of a local thermostat set pointadjustment potentiometer will causethe UCM to revert to the edited occu-pied cooling and heating set point.

Communications Failure

A fifteen-minute failure in communica-tions between the UCM and TracerSummit will cause the UCM to:�Operate in the occupied mode

(provided that no occupancy sensor ispresent on input TB4-1).

� Set the IAQ multiplier to 1.0.

� Disable the control offset.

�Use the control action as determined bythe auxiliary sensor. The auxiliarytemperature is compared to the zonetemperature. If the supply airtemperature is 10oF greater than thezone temperature, then the controlaction will be heat. If the supply airtemperature is less than or equal to thezone temperature, the control actionwill be cool. If the supply airtemperature is between the zonetemperature and the zone temperature+10oF (zone temperature < supply airtemperature < zone temperature +10oF), the control action remains thesame and the UCM controls to theminimum flow set point.

If an auxiliary sensor is not installed andthe VAV unit is not under Tracer Summitcontrol, the UCM will retain the lastcontrol action in effect.


28 VAV-SVX01B-EN

Chapter Overview

This chapter contains informationabout the following:� VAV air balancing

� VAV water balancing

Air BalancingAfter the unit has been mounted and allelectrical and duct connections havebeen made, the air distribution systemshould be balanced. The proper variableair volume balancing proceduresdepend on the type of VAV system usedand the options specified on theVariTrane unit. This section will coverthe basic balancing procedures andcalibrations needed to balance an airdistribution system using VariTraneunits. This section suggests only onebalancing procedure. Since there aremany possible air balancing proce-dures, keep in mind that these proce-dures are only suggestions.

Note: Before performing these balancingprocedures, the calibration commandshould be initiated at least 15 minutesprior to the balancing procedure.

1.System Checkout� Check the VAV system installation for

conformity to design.�Walk the entire system from air

handling equipment to the terminal unitto determine variations of installationfrom the plans.� Check for inadvertent obstructions in

the ductwork (such as closed firedampers).� Insure that any turning vanes, filters,

and dampers (both volume and fire) areinstalled in the correct position.� There should be a 1.5 duct diameter

long run of straight ducting into thevalve.� Set the outside air dampers to their

minimum position.� Start the supply and return air fan(s).2.Before we can balance the system, we

need to ensure that there is enoughCFM for all zones.

A.Drive all VAV boxes MAX.� Starting with each individual branch

duct, open all the VAV units in thatbranch duct to the maximum coolingposition.� This can be done using EveryWare by

giving each UCM a “Drive Max”

command or by rotating the Zonesensor set point knob to the “ * “position, and hold the TOV ON buttonfor two seconds.� The damper will remain at its maximum

set point until the zone sensor knob ismoved back into the normal operatingrange.

B.Read airflow at the most remote unit.

� In most systems, this will be the VAVunit located furthest from the fan.� This will be the unit in the system that

will be critical from an air deliveryset point.

A.If airflow is not adequate, increase thesupply fan CFM to achieve adequateairflow.

B.Make the required adjustments topulley sizes, motor sizes and electricalconnections to accommodate fan-speed changes.

3.With all VAV boxes fully open, take ameasurement of the total CFM.� CFM is determined by using this flow

signal and the chart on the side of theunit (different size units have differentcharts).� If the CFM is at or above design, the

system can now be balanced. If themeasured CFM is below design, insurethe VariTrane unit is in full coolingposition.� If the air delivery through this VariTrane

unit is still below the designrequirements, the supply fan rpmshould be increased until the correctdesign airflow is obtained or the fanreaches its maximum capacity.� If after adjusting the fan to its maximum

capacity there is still a shortage ofairflow, shut off part of the system toprovide enough airflow to balance theother part of the system. This can bedone using the “Override toUnoccupied” command (“**”) at thezone sensor.

4.After determining that there is enoughCFM for all zones, drive all the VAVboxes to MIN.

Air Balancing andWater Balancing

CHAPTER 6: AIR BALANCING & WATER BALANCING

VAV-SVX01B-EN 29

Note: If the VAV boxes have already beenassigned to groups and these groups areseparate thermal zones, then thebalancing can be done on a group basis.

5.Select a group to balance and give thatgroup a flow override Drive MAXcommand.

Note: If the VAV boxes have not beenplaced in a group, each individual UCMcan be overridden to Drive MAX in theUCM Setup Menu. However, this will bemore time consuming.

6.Adjust each VAV box maximum flowset point required for its zone using theUCM set points menu.

7. After balancing a group/box, return thatgroup/box flow override to AUTO.� Continue to the next group/box

repeating steps 6 through 8 until eachunit is delivering the correct CFM.

8.Upon completion of the VAV airbalancing:� Remove all overrides.� Initiate a recalibrate command.

Air Balancing andWater Balancing

Water BalancingEach VAV UCM can have its hot watervalve overridden to drive fully OPEN (2-position and proportional). This can bedone in the UCM setup menu and canbe used to assist in water balancing.

1.Log on to the UCM with EveryWaresoftware.

2.Select a VAV box to balance, and driveits hot water valve open (max hot wateroverride).

3.Using hydraulic pressure gauges,measure the flow across the high andlow ports. Convert this data from apressure differential to gallons perminute (GPM).

4.Adjust the circuit setter until it is withindesign specifications.

5.Once achieved, lock the circuit setter inplace. Mark the position with apermanent indicator.

6.Remove all gauges and softwareoverrides.

7. Initiate a recalibrate command.

30 VAV-SVX01B-EN

General Information

Spread Spectrum

Trane Wireless VAV Systems applyspread spectrum technology toaccomplish wireless communication.Spread spectrum technology is atechnique for spreading a data signal’sinformation over a frequency range thatis substantially larger than is required,thus increasing the redundancy of thecommunication. Upon reception, thereceiver “unspreads” the signal andreads the information. Any receiver thatdoes not have a matching encodingsequence can not unspread the signaland sees the transmission as RF noise.This spreading and unspreadingenhances the security of the systemand its ability to operate in the sameenvironment as other systems usingthe same frequencies.The sensor/transmitter simultaneouslybroadcasts identical information overtwo separate frequencies (911 and 918MHz), making interference even lesslikely.

Purpose of the Wireless System

The wireless system is a method foreliminating the problems associatedwith a wired sensor such as having torun wire through solid or decorativewalls or having to move the sensorafter the occupant has redecorated thespace. The benefits are the flexibility insystem design and sensor location.Zone sensor operation with wirelessoffers some new capabilities. The firstfeature is averaging. If more than onesensor is assigned as an averagingsensor to a UCM their temperaturereadings are averaged. This gives theability to get a more accurate sample of

Wireless VAVSystems

Chapter Overview

This chapter describes the wirelesszone sensor system including systemlayout, component functionality, andspecifications.

a large space supplied by one VAV box.It also provides better control when 1VAV box serves multiple zones such assmall offices. Under the averagingscheme, the local set point requests arealso averaged. The set point averagecan be weighted by changing the setpoint Vote value from 0 to 9. Thenumber assigned represents thenumber of votes the sensor gets. AValue of “0” removes this sensor fromthe set point voting scheme.

For example:Set Point Set Point Extended

Sensor Value Vote Value

T1 75 x 3 = 225 T2 65 x 1 = 65

Total 4 290

Calculation: 290/4 = 72.5°F Final Set Point Value

This allows someone who is moreaffected by the temperature or in anarea that has a varying load such ascold or hot outside walls to have moreimpact on the set point.

An additional capability of the system isthe ability to use a sensor as a backupto another sensor. If the primary sensorstops communicating for some reasonthe UCM automatically begins usingthe backup sensor input.

Another added feature is the ability toassign one sensor to multiple boxes.This is a function of the way the sensortransmits its information.

When the sensor broadcasts itstemperature it also sends the serialnumber, the set point and the battery

CHAPTER 7: WIRELESS VAV SYSTEMS

Figure 6. Wireless Zone Sensor and Receiver

VAV-SVX01B-EN 31

status. Each receiver that receives thissignal checks to see if any of the UCMson its VAV link needs that sensor’svalue. If a UCM needs the value thereceiver sends the information downthe link and the UCM reads it. Thisprocess means all UCM’s could use thesame sensor.

Specifications

Wireless Receiver Power Requirements

Input Voltage Connections: The receiverrequires 24 VAC and 60 HZ from adedicated 40 VA transformer (notprovided with the receiver).Blue Wire: 24VAC (HOT wire)

Yellow Wire: 24VAC (NEUTRAL wire)

Green Wire: Earth GROUND

Red Wire: To Positive (+)Communication Link

Black Wire: To Negative (-)Communication Link

NOTE: A dedicated 24 VAC, 40VA class 2transformer is required to power theWireless Receiver. Failure to comply willresult in malfunction of the Receiver dueto electrical noise.

All wiring must comply with theNational Electric Code (NEC) and localcodes. Use 16 AWG for power wiring.Maximum wire lengths should bebased on NEC specifications.

Zone Sensor Power Requirements

The zone sensors require two 3-volt “2/3 A” lithium batteries. Each sensorships with two batteries, and theaverage expected battery life is approxi-mately 1.5+ years.

NOTE: Excessive transmissions willshorted the battery life span. SeeFrequently Asked Questions for moredetails.

Both batteries must be installed forsensor/transmitter to operate properly.Acceptable replacement battery modelnumbers are Varta 123A, PanasonicCR123A, or Duracell 123A.

Wireless Receiver Mounting

The receiver will work best if mounted below the ceiling grid with the antennaepointing down. The receiver is to be hung from the roof structure like a light fixture. Ahook on the back is provided for connection of a chain. A threaded nipple is providedfor attaching a handy-box when the wiring must be run in conduit.Ideally, the receiver should be located an equal distance from all its assigned zonesensors.

NOTE: Do not mount the wireless system near RF barriers such as elevators. Failure todo so may result in wireless system malfunction.

Wireless VAVSystems

Zone Sensor Mounting

Zone sensors are installed in areas where temperature control is to be maintained.The sensor mounts directly to the wall by either using Velcro or by attaching thebackplate and then snapping the sensor body into place.

Product Specifications

� At least one (1) wireless receiver is required per com link

� Receivers per CCP: 6

� Receivers per Tracer Summit: 31

� Total Zone Sensors per CCP or Tracer Summit: 255

� Backup Zone Sensors per VAV box: 1

� Averaging Zone Sensors per VAV box: 4

� Zone Sensors associated with one VAV box: 5

�Maximum number of VAV UCMs per link: 63

�Maximum Distance from Receiver to Sensor: 1000ft.(304 m)

�Minimum Time between Transmission: 30 sec

� Loss of Sensor Communications Alarm: 24 min

� Average Battery Life: 1.5 years

�Use 18 gauge twisted shielded pair communications wire for the ICS communicationlink to the receiver. The communications link is polarity sensitive.

Dimensions

Receiver Sensor

Enclosure: Sheet metal/Plastic PlasticHeight: 2.5” (64 mm) 4.0” (102 mm)Width: 8.5” (216 mm) 5.0” (127 mm)Depth: 9.0” (229 mm) 1.5” (38mm)

32 VAV-SVX01B-EN

NOTE: A dedicated 24 VAC, 40VA NECclass 2 transformer is required to powerthe Wireless Receiver. Failure to complywill result in malfunction of the Receiverdue to electrical noise.

All wiring must comply with theNational Electric Code (NEC) and localcodes. Use 16 AWG for power wiring.Maximum wire lengths should bebased on NEC specifications.

General Information

Zone Sensor Range:Cataloged 1000 feet (304 meters) line-of-sight, indoorsReceiver Setup/Normal Switch:DIP switch 8.

Receiver RJ11 Jack:Jack for temporary connection of anexternal sounder for test purposes.

Receiver Sounder:Built-in Piezo sounder

Receiver VAV Link Wiring:

The Receiver must be daisy-chainedinto the VAV link wiring that connectsall of the UCMs and Tracer Summit. Asspecified in Chapter 2, the VAV linkwiring must be twisted shielded pair. Apigtail is provided for wiring. The redwire is positive, the black wire isnegative, and the green wire is shielded

ground. Polarity must be maintainedthroughout the VAV link.

Wireless System Architecture

Wireless Zone Sensor

The wireless zone sensor is designedfor use in a temperature controlsystem, operating in conjunction with acentrally located Wireless Receiver.Zone sensors are installed in areaswhere temperature control is to bemaintained and are responsible fortransmitting temperature, set point, andthe On/Cancel command to thereceiver. The zone sensor measurestemperature and periodically transmitsthat information via RF signals to itsassigned receiver.Wireless Receiver

The receiver is designed for use in atemperature control system, operatingin conjunction with wireless zonesensors, which are installed in areaswhere temperature control is to bemaintained. The receiver functions as acommunications translator betweenthe spread spectrum radio communica-tions and the VAV communications link.As a Spread Spectrum Receiver, thedevice receives, correlates and decodesa spread spectrum coded transmission.The serial number of the transmitting

Wireless VAVSystems

device is checked against a list of validserial numbers field programmed intothe Translators by the Tracer BASsystem user. The receiver maintains thislist of valid serial numbers. If thetransmission is valid, the message willbe transmitted over the Trane VAV link.RF signals from wireless zone sensorsare received by the receiver, which thensends appropriate messages viacommunication wires to specificheating and air conditioning equipmentassigned to it. This information is alsosent to a central controller for systemmonitoring.

Note: A minimum of one receiver percommunication link is required.

Unit Control Module (UCM)

After the zone temperature is receivedby the Receiver from the wireless zonesensor module and broadcast over theVAV Communication link, the UCMreceives the message packet. The UCMaccepts only those messages having asensor serial number that matches theserial number field programmed into it.Zone sensor serial numbers aremaintained by the UCM.Upon receipt of the zone temperaturevalue, local set point, or On/Cancelrequests, the UCM will take the

Figure 7. Receiver Wiring Connections

VAV-SVX01B-EN 33

appropriate action. In addition, atwenty-four minute timer is initiated. If anew zone temperature value is notreceived within this time, a sensorfailure indicator is generated.

If all the averaging sensors have failedand a backup zone sensor serialnumber was programmed into theUCM, the zone temperature value, setpoint, and On/Cancel status from thatsensor will then be used for control. TheUCM will continue to monitor the linkfor the averaging sensor information. Ifreceived, normal operation is restoredand the sensor failure indicator cleared.

While in many cases a single sensorand backup sensor are programmed inthe UCM, it is also possible to define upto three additional optional zone sensorserial numbers. The UCM will then usethe average of all of the programmedsensors (except the backup sensor) asthe value representing the spacetemperature. Values from sensors thathave been flagged as not reportingwithin the last fifteen minutes will notbe used in the calculation. While anaveraging scheme is used to determinethe space temperature when multiplesensors are used, a weighted averagescheme is used to determine the setpoint. This scheme allows the user toselect the relative priority of each zonesensor for the purpose of determiningthe desired set point. However, any ofthe sensors may be used to initiate On/Cancel requests.

Wireless System Installation

Building Location

The receiver should be located centrallyto all of the zone sensors. Largeductwork, metal covered walls orreinforced concrete can block the signaland should be avoided. Elevator shaftsare typically sources of interference andtherefore should also be avoided.Maximum range is 1000 feet (304.8 m)line of sight indoors (a maximum of 500feet (152.4 m) total is recommended).Setting the Receiver Address

The address is set using the DIPswitches mounted on the receiver. Thereceiver is a “COM 4” master and doesnot replace a UCM address. Up to 6receivers may reside on a Communica-

tion Link when using a CCP and up to 31 receivers may reside on a CommunicationLink when using a Tracer Summit.DIP switches 6 and 7 are not used and should be set to their “ON” position. DIPswitch 8 is the setup/normal switch and is only used when the unit is being assignedsensors using the set-up tool. When assigning zone sensors to the receiver using theset-up tool, set DIP switch 8 to the Off (Down) position. During normal operation, DIPswitch 8 should be in the ON (Up) position. The following chart shows the switchpositions for addresses 1 through 31.

Table 5 – VAV Wireless Receiver DIP Switch SettingsUCM VAV Wireless Receiver DIP Switch Settings

Address DIP 1 DIP 2 DIP 3 DIP 4 DIP 5 DIP 6 DIP 7 DIP 8

1 OFF ON ON ON ON ON ON ON*2 ON OFF ON ON ON ON ON ON*3 OFF OFF ON ON ON ON ON ON*4 ON ON OFF ON ON ON ON ON*5 OFF ON OFF ON ON ON ON ON*6 ON OFF OFF ON ON ON ON ON*7 OFF OFF OFF ON ON ON ON ON*8 ON ON ON OFF ON ON ON ON*9 OFF ON ON OFF ON ON ON ON*10 ON OFF ON OFF ON ON ON ON*11 OFF OFF ON OFF ON ON ON ON*12 ON ON OFF OFF ON ON ON ON*13 OFF ON OFF OFF ON ON ON ON*14 ON OFF OFF OFF ON ON ON ON*15 OFF OFF OFF OFF ON ON ON ON*16 ON ON ON ON OFF ON ON ON*17 OFF ON ON ON OFF ON ON ON*18 ON OFF ON ON OFF ON ON ON*19 OFF OFF ON ON OFF ON ON ON*20 ON ON OFF ON OFF ON ON ON*21 OFF ON OFF ON OFF ON ON ON*22 ON OFF OFF ON OFF ON ON ON*23 OFF OFF OFF ON OFF ON ON ON*24 ON ON ON OFF OFF ON ON ON*25 OFF ON ON OFF OFF ON ON ON*26 ON OFF ON OFF OFF ON ON ON*27 OFF OFF ON OFF OFF ON ON ON*28 ON ON OFF OFF OFF ON ON ON*29 OFF ON OFF OFF OFF ON ON ON*30 ON OFF OFF OFF OFF ON ON ON*31 OFF OFF OFF OFF OFF ON ON ON*

Wireless VAVSystems

Power Checkout

The receiver has three (3) LEDs.�Green (Power/operational)

� Yellow (Radio communication activity)

� Red (VAV Link activity)

The green LED will remain on to indicate steady power. The yellow LED will flash toindicate the receiver is receiving radio communication for the sensors. The red LEDwill flash to indicate the receiver has passed the information to the VAV link.

The zone sensor has one (1) LED. It is located next to the service tool connection atthe bottom of the sensor. Pressing the ON or Cancel buttons causes a transmissionto occur and the green LED should flash. This indicates the sensor has power andshould be transmitting.

34 VAV-SVX01B-EN

Programming and Operation

Wireless Receiver Setup Using Tracer Summit1. To setup the Receiver, go to the Main Menu of the Tracer Summit.2. From the Main Menu, select the Setup Pull Down Menu and select the Site Configuration option.3. Highlight the site name to be configured to enter the site configuration editor4. Select the Devices tab.5. Highlight the BCU to be modified and select the Create UCM Editor. See Figure 8.6. Select the Non-Isolated link, which has the receiver connected to it. See Figure 9.7. Change the UCM Type from Absorption Chiller (UCP2) to Wireless Receiver. See Figure 9.8. Give the receiver a unique name, address, and specify how many receivers are going to be added to the network. See Figure 9.9. Click the create button.10.Click the save button to save the changes to the BCU.

Figure 8: Site Configuration, Devices Tab

Wireless VAVSystems

VAV-SVX01B-EN 35

Wireless Receiver Summary Using Tracer Summit

This option only shows up after the wireless receiver has been setup as described above. This option will show the summary of theinformation that the receiver is receiving, including zone sensor number (the serial number), TR Time Sec. (Time since the lasttransmission was received in seconds) and RSSI (Receiver Signal Strength Indication). TR Time should not exceed 420 and RSSIshould be between 30 and 255. If TR exceeds 1440, the 24-minute timer has expired and the sensor will show a failure.

1.From the Main Menu, select the Setup Pull Down Menu

2.Highlight the Unit Controllers option and select the VariTrane UCM II/III/IV... Editor

3.Select any UCM that is connected to the receiver and press the “OK” button

4.In the UCM II/III/IV... Editor, open the wireless folder

5.Change the Wireless Receiver Name from Not Assigned to the correct name of the receiver and wait approximately 15 seconds.

The receiver summary will include all sensors from which the receiver is receiving information and should look like the following:

Figure 9: Create UCM’s Dialog

Time Since LastZone Sensor Receiver Signal Zone Transmission

# SN Strength Indicator Temp (seconds)

1 00004F 125 75.4 1202 000017 135 71.5 303 00005F 75 76.2 2004 0000163 140 73.8 1705 00004B 110 72.0 1006 00014A 120 70.6 90

Notes: 1Average will use the sensed temperature in the temperature averaging calculation. If this is the only sensor the average willbe the sensed temperature.2Backup means the UCM will use this temperature only if the primary sensor assigned to the UCM has stopped communicating.3Set point vote determines the weighting of the set point vote. The range is 0-9. This number represents the number of votes thesensor gets when the set points are averaged. If “0” is selected the sensor gets no vote. This is used to disable the thumbwheel.

Name the Wireless Receiver,select and address, and specifythe quantity of Receiver UCMsto create.

Select the WirelessReceiver UCM Type.

Click here to create theWireless Receiver UCM(s)

Select a Non-Isolated Com 4 Link.

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36 VAV-SVX01B-EN

Wireless Zone Sensor Setup Using TracerSummit

1. From the Main Menu, select the SetupPull Down Menu

2. Highlight the Unit Controllers optionand select the VariTrane UCM II/III/IV...Editor

3. Select the UCM to be modified andpress the “OK” button

4. In the UCM II/III/IV... editor, open thewireless folder. See Figure 11.

5. Change the Wireless Receiver Namefrom Not Assigned to the correctname of the receiver. Click on the firstavailable “Edit Average Zone Sensor”1

or the “Edit Backup Zone Sensor”2

menu, depending on if the sensor is tobe an Averaging sensor or a Backupsensor. See Figure 11.

6. Open the plastic cover of the zonesensor, and type the serial numberfrom the ID tag into the “Average ZoneSensor Serial Number” field. The validrange is 000000 to FFFFFF.

7. Adjust the value desired in the “SetPoint Weight”3 field.

8. Click the “Add this Sensor” button toadd to the UCM’s database. See Figure11.

9. Repeat steps 5 through 8 to addadditional sensors. You may add up tofour (4) Average Zone Sensors perVAV UCM.

10.Once complete, press the exit buttonto return to the UCM editor.

11. Click the “Save” button to save thechanges to the UCM.

Notes:1Average will use the sensed temperaturein the temperature averaging calculation. Ifthis is the only sensor the average will bethe sensed temperature.2Backup means the UCM will use thistemperature only if the primary sensorassigned to the UCM has stopped com-municating.3Set point vote determines the weightingof the set point vote. The range is 0-9. Thisnumber represents the number of votesthe sensor gets when the set points areaveraged. If “0” is selected the sensor getsno vote. This is used to disable thethumbwheel.

Figure 10: VAV UCM Editor, Wireless Tab

Select the Wireless Receivercorresponding to the edited VAV UCM.

Add and/orEdit Zone Sensor

Monitor Wireless Zone Sensors Here.

Figure 11: Average Zone Sensor Setup DialogEnter the Wireless ZoneSensor Serial Number.

Click Here to Add this Sensor.

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VAV-SVX01B-EN 37

Wired Zone Sensor Setup Using TracerSummit

If a wired sensor is also attached to theUCM, the next step will be to make thewired sensor a backup or an averagedinput. This can be done as follows:

1.From the Main Menu, select the SetupPull Down Menu

2.Highlight the Unit Controllers optionand select the VariTrane UCM II/III/IV...Editor

3.Select the UCM to be modified andpress the “OK” button

4.In the UCM II/III/IV... Editor, open thewireless folder

5.Change the Wireless Receiver Namefrom Not Assigned to the correct nameof the receiver. Open the first available“Edit Wired Zone Sensor”1 menu.

6.Averaged1, Primary Backup2, orSecondary Backup3.

7. Adjust the value desired in the “SetPoint Weight”4 field.

8.Once complete, press the okay buttonto return to the UCM editor.

9.Press the “Save” button to save thechanges to the UCM.

Notes:1The Averaging choice means the sensedtemperature will be averaged with thewireless sensors and set point tempera-ture will be averaged according to theset point vote selected in option 20.2First backup means the UCM will lookfor a wired sensor first if the wirelesssensor fails.3Second backup means the UCM willlook for a wireless backup sensor first ifthe wireless sensor fails.4Wired Set Point Weight determines theweighting of the set point vote. Therange is 0-9. The number chosen is thenumber of votes the sensor gets in thedetermination of the set point. If “0” isselected the sensor gets no vote. This is

used to disable the thumbwheel.

Wireless Zone Sensor Setup Using theSetup Tool:

The setup tool has a Green LED toindicate power and red LED to signal atransmission.

1.The first step is to move DIP switch 8 onthe receiver to the setup mode.

2.To setup the sensor, remove the frontcover of the zone sensor, insert the pluginto the keyed socket at the bottom ofthe circuit board.

The display reads:

Trane Setup ToolPress Any Key

Pressing any key produces thefollowing display

UCM Address? 00Add Average 1

To assign the sensor as an averagingsensor to a specific UCM enter theUCM Address (1-63) and press send.The receiver will beep 3 times toindicate a successful assignment.

The setup tool provides additionalcapabilities as well. The sensor can beadded as an averaging sensor or as abackup to another Wireless sensor. Amaximum of four (4) averaging sensorsand one (1) backup may be assigned toa UCM. The set point vote can bechanged from 0-9 by pressing the “SetPoint Vote” button. The sensor use istoggled by pressing the “AVERAGE/BACKUP” button on the setup tool. Thesend button executes the command.The receiver will beep 3 times toindicate a successful assignment.

In addition to adding a sensor the setuptool allows the user to delete anassigned sensor or purge all sensorsassigned to a particular UCM. Theseoptions are selected by pressing the“ADD/DELETE/PURGE” button. Thesend button executes the command.

The receiver will beep 3 times toindicate a successful assignment.

The service tool can be used to check ifthe receiver is receiving the RFtransmissions. While in the defaultscreen:

UCM Address? 00

Add Average 1

Press “Send.” The receiver will beeptwice to indicate it received the signal.

The “BATTERY/SERIAL#” on the setuptool reads and displays the sensor’sserial number and battery level.

To return to the main screen at any timepress the “Clear Screen” button.

The setup tool has an energy savermode that initiates after approximately1 minute of inactivity. Pressing any keytwice will wake up the setup tool. Whilein the energy saver mode the LCDblanks and the red and green LED’sflash.

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38 VAV-SVX01B-EN

Chapter Overview

This chapter contains the troubleanalysis for UCM 4.0 problems,wireless receiver problems, andprovides answers to frequently askedquestions pertaining to wirelessreceivers.

UCM 4.0 ProblemsIn the event that the UCM doesnot communicate, properlyinspect the following:

1.Incorrect supply voltage� The green LED indicates power and

should be “steady” ON.

�Measure the power input to TB1-1(common) and TB1-2 (ground) of theUCM board. The supply voltage shouldbe between 20 and 28 VAC (24 VACcataloged). However, voltages at eitherextreme may result in systeminstability.

2.Communication link polarity isreserved.� The yellow LED will be ON indicating a

reversed polarity. Switch thecommunication link connection.

3.UCM is not addressed correctly� Verify the DIP switch settings on the

UCM.

4.Communication link signal hasinterference� Communication link should not be

routed near or with any voltage source.

5.Incorrect wire used� Recommended wire is twisted shielded

pair. See Chapter 2 for the wiringspecifications for the UCM.

6.Defective UCM board� Be sure all other recommended actions

listed above have been taken.Disconnect the communication linkfrom the board and check the board’sability to communicate with the TraneEveryWare Software. Ifcommunications do not exist, theboard is assumed defective.

In the event that the UCM will notdisplay data, properly inspect thefollowing:

1.UCM not correctly addressed or twoUCM’s addressed the same� Check the DIP switches on the first VAV

box and remove the communicationlink from the second VAV box.

2.Communication wiring error (shorts,open, or reversed polarity)� Remove the communication link past

the first VAV box and verify the polarity.Check resistance across thecommunication wires for possibleshorts or open circuitry.

3.UCM has no power� Check the green power LED and check

the 24 volts AC supply at TB1 on theUCM board. Voltage should be between20 volts AC and 28 volts AC (24 VACcataloged). However, voltages at eitherextreme may result in systeminstability.

4.Failed UCM on the communication link�One UCM failure can bring down all

UCM communications.

In the event that the UCM reportsan incorrect zone temperature orset point, properly inspect thefollowing:

1.Zone sensor wired incorrectly� Check wiring for the correct

connections. See Chapter 2 for furtherdetails on zone sensor wiring.

2.Defective zone sensor�Disconnect the zone sensor terminal

plug from the UCM and using anOhmmeter, measure the resistanceacross the plug terminals TB3-1 andTB3-2 for the set point. Compare theresistance to temperature using Table 8in Chapter 5.

�Additionally, measure these values atterminals 2 and 3 on the zone sensor.These values should be near thosemeasured above. If not, the connectingwire is faulty.

In the event that the zone sensor isreading incorrectly, properly inspect thefollowing:

1.Zone sensors open or shorted out� Check the resistance across the wires

at the UCM and compare the resistanceto the values shown in Table 8.

2.Actual room temperature is higher orlower than what the UCM reads� Check the location and installation of

the zone sensor. Change the calibrationfactor in the UCM setup screens.

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VAV-SVX01B-EN 39

3.More than one UCM connected to asingle zone sensor� Cut jumper wires (W1 and W2) on all

slave units.

In the event that the UCM is notreading or incorrectly reading theset point knob, properly inspectthe following:

4.Open circuit or shorted wiring to setpoint knob� Check the resistance across the wires

at the UCM and compare the resistanceto the values shown in Table 8.

5.Zone Sensor set point wheel is disabled� Enable the zone sensor in the UCM

setup menu.

6.More than one UCM connected to asingle zone sensor� Cut jumper wires (W1 and W2) on all

slave units.

In the event that the measuredflow reads incorrectly (i.e.different from the balance report),properly inspect the following:

1.The tubing or flow ring is off, reversed,plugged, or has a leak� Check with a magnehelic gauge and

compare with the delta pressure (DP)chart located on the VAV box.

� Check the tubing for reversal and/orleaks.

� Check the flow ring for plugged holes.

2.Wrong unit size downloaded into theUCM setup menu� Verify that the actual unit size matches

the unit’s nameplate.

3.Poor inlet configuration� Trane recommends 1½-duct diameters

of straight duct before the inlet of thebox (a 12-inch box should have 18inches of straight run duct before theinlet).

4.UCM going through a recalibrate� Check the recalibrate override and wait

for the unit to finish the calibration.

5.Measured flow reading from flow hooddiffers from UCM’s flow reading� After verifying that none of the above

conditions exist, follow the steps forcalibration listed under the Air ValveReading Position Instead of Flowsection. If a discrepancy between theflow hood CFM and the UCM CFM still

exists, change the flow calibrationfactor by entering the actual CFM as the“Measured Cooling Flow” in the UCMsetup menu.

In the event that the fan and/orheat outputs are not energizing,properly inspect the following:

1.UCM downloaded incorrectly� Check fan and heat type parameter.

2.Minimum heating CFM is not beingmet, airflow is too low� Increase the airflow or lower the

minimum heating flow.

3.Fan/Heat relays have failed� Remove fan/heat wires from UCM and

apply 24 VAC directly.

Note: UCM Outputs are switched toground. Do not jumper 24 VAC to J9, J10,or J11 because damage will occur.

4.Tracer Summit has the fan/heat outputsdisabled� Check group, global, and/or Tracer

overrides.

5.A flow override exists locking out thefan/heat outputs� Check group, global, and/or Tracer

overrides.

6.Outputs on the UCM are configured asnormally closed� Verify the output configuration in the

UCM setup menu.

7. Zone temperature is at or above theheating set point� Increase the UCM heating set point.

In the event that the air valve isnot modulating, properly inspectthe following:

1.Tracer Summit or UCM hasenabled an override function� The overrides are Open, Closed, Min, or

Max. Disable all overrides.

2.UCM is going through a recalibrate(reset) command�Wait for calibration to finish.

3.Air valve motor has failed� Check motor by applying 24 VAC

directly to common (blue) and open(black)/close (red) wires.

Note: UCM Outputs are switched toground. Do not jumper 24 VAC to J1-3 orJ1-4 because damage will occur.

4.Zone temperature is greater than theheat set point or less than the cool setpoint� Change the heat and/or cool set points.

In the event that the air valve isreading position instead of flow,properly inspect the following:

1.Airflow is below 5% or above 110%cataloged� The UCM reverts to pressure

dependent mode (position control) andposition is displayed rather than CFM.

2.Unit type is not VariTrane nor Generic� Change the unit type to VariTrane or

Generic.

3.Transducer has failed� Pressure transducers are responsible

for reading the airflow across the flowring and converting it to an electronicsignal. This signal is sent back to theUCM board and flow is read at theUCM status and setup screens. When apressure transducer fails, the air valvewill assume pressure dependentoperation and reverts to positioncontrol. To determine whether or not thetransducer has failed, perform thefollowing steps:

A.Check the 24 volts AC supply at TB1 onthe UCM board. Voltage should bebetween 20 volts AC and 28 volts AC.

B.Read the input voltage to thetransducer from the UCM controllerbetween the green and red wires on J3of the UCM board. The voltage shouldbe between 4.50 volts DC and 5.50 voltsDC (5 volts DC cataloged).

C.Remove the high and low tubes fromthe transducer (to simulate no flow).Read the transducer output voltage onJ3 of the UCM board between the greenand the black wires with a voltmeter.The voltage should be between 0.20volts DC and 0.30 volts DC (0.25 voltsDC is the null voltage output of thetransducer indicating zero flow).

D.Replace the tubes on the transducer.Check the transducer tubes and theflow ring to make sure that they arepositioned correctly and properly

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40 VAV-SVX01B-EN

attached. With flow going across theflow ring, read the transducer outputvoltage between the green and theblack wires. The difference between thisvoltage and the zero flow voltageshould be 0.100 volts DC minimum (1”Delta P equals 1.0 VDC, and voltageshould increase as flow increases). If a0.100 volts DC minimum is not present,check the transducer tubing with aMagnehelic differential pressure gaugeand compare it with the delta pressure(Delta P) chart located on the VAV boxto ensure that there are no clogs orplugs. In order to see if the flow ring isclogged or leaks, check with aMagnehelic differential pressure gaugeto see if there is flow going across theflow ring.

E.Calibrate the transducer. Calibration isissued from EveryWare softwarerevision 1.35 by command function 6(F6) (see the following procedure). Thiswill take effect immediately.

Note: Cycling power to the VAV boardwill automatically cause the unit tocalibrate, however, following the proce-dure outlined below will provide a moreaccurate calibration. It is only necessaryto perform this procedure in instanceswhere you are experiencing incorrectflow readings or if the unit reverts topressure dependent mode despite beingabove 5% and below 110% of catalogedflow and performing a “normal calibra-tion” (i.e. hitting F6) does not correct theproblem.

Steps for Calibration:1.Log on to the UCM with EveryWare

software.

2.Turn the central air handler “off.” If thisis not possible, Trane recommendspulling the transducer tubes off duringthe calibration process to simulate this.

3.Select the “calibrate unit” option bypressing command function 6 (F6).

4.EveryWare software will indicate thatcalibration is taking place.

5.When calibration is complete, the boxwill release to auto.

6.Drive the box open to make sure thatthe box is not below 5% of its catalogedCFM. The controller is accurate in

reading flow from 5% to 110% ofcataloged CFM. For example, a size 17air valve is accurate between 85 CFMand 1870 CFM.

7. Release the box to auto and performany necessary balancing work.

Wireless Receiver TroubleAnalysis

Wireless Zone Sensor FunctionalElectrical Test

This check should be performed after azone sensor has been mounted and thebatteries have been installed. The covermust be off.If the sensor is equipped with atemperature control, set the control dialwith “70” in the 9 o’clock position.Press either one of the two push buttonswitches on the upper left side of thesensor. The green LED near the bottomof the circuit board should flash eachtime the push button is pressed. If itdoes not, check that both batteries aregood and are properly seated in theholders.

In normal use, the green LED will flasheach time the zone sensor transmits amessage, usually several minutesapart.

Checking Receiver Operation

This check should be performed afterall zone sensors for the receiver havebeen installed. When power is applied,check the operation of the three LED’son the receiver as follows.Green LED (Power Indicator): Indicates24VAC power to receiver. Should be litcontinuously. If not lit, check 24-volttransformer connections. If 24 VAC ispresent but Green LED is off, returnreceiver for service.

Red LED (VAV Link ActivityCommunications Indicator): Will be litfor a few seconds after power isapplied; when initialization iscompleted, this LED will blinkperiodically, indicating RS-485communications to specific heatingand air conditioning equipmentassigned to the receiver.

Yellow LED (Radio CommunicationActivity Signal Indicator): Will be lit for afew seconds after power is applied:

when initialization is completed, thisLED will blink when a RF signal is beingreceived from a sensor.

Receiver will not upload from ReceiverSummary

1.Verify power to the receiver.2.Verify the address on the receiver.3.Verify polarity of the VAV Link.4.Verify that the receiver is grounded.

Receiver uploads but no sensors arereporting

1.The receiver/translator polls all of theUCM’s periodically to see if a newsensor has been assigned then thereceiver/translator adds the serialnumber to its list of sensors to monitor.This process can take approximately 8minutes.

2.Verify that the sensor is transmitting bypressing the On or Cancel buttons onthe sensor and observing the greenLED on the sensor’s circuit board nextto the setup tool connection. It shouldflash to indicate a transmission.

3.If the sensor is transmitting, move itwithin 20-30- feet, line of sight, of thereceiver and press the On or Cancelbuttons. The yellow LED on the receivershould flash indicating that the signalwas received and immediatelyafterwards the red LED should flashindicating the message has beentranslated and sent on the VAV link.

4.To check for a completed transmission,plug the service tool into the sensorand perform the RF transmission testby pressing the “Send “ key from thedefault menu. The receiver will beeptwice to indicate a successfultransmission.

RSSI’s are too low1.Verify the antenna is properly installed

and making good contact with thesocket. The antenna must be verticallyoriented.

2.Check the location. Place the receiver inan ideal location for radio reception toverify it is working properly and thenmove it to a more aesthetically pleasinglocation while maintaining adequatereception. An ideal location would becentral to all transmitters and not closeto any electrical equipment or largemetal structures.

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VAV-SVX01B-EN 41

Frequently Asked WirelessReceiver Questions

What is the life expectancy of thebattery?

The battery life is expected to be 1.5+years depending on the environment inwhich the sensor is installed. Thesensor is designed to minimize thefrequency of communication whilemaintaining space temperature control.The sensor transmits on demand, suchas when the temperature changes, theOn/Cancel button is pushed, or thethumbwheel is turned. The morefrequently the sensor transmits itsinformation the shorter the battery life.A sensor in an entry will transmit thetemperature swing every time the dooropens but a sensor in an interior officewill transmit much less frequently.The battery life of wireless zonesensors is primarily due to the numberof times that the sensor reports to thereceiver. The sensor “senses” thetemperature every 10 seconds. Themaximum time a sensor will go withoutreporting to the receiver is 420 seconds.The minimum time the sensor will gobefore reporting is 30 seconds.Obviously, the more times the sensorreports to the receiver, the shorter thebattery life will be.

What causes the sensor to report it’s“sensed” readings? There are twothings that cause the sensor to report:1) changes or adjustments to thethumbwheel set point, and 2)temperature fluctuations greater than 1degree F. The more the sensor reports,the shorter the battery life will be. Toreduce the number of reports and thusincrease the battery life, avoid placingthe sensor in locations wheretemperatures frequently fluctuate. Tranerecommends avoiding placing thesensor in locations where “drafting” isan issue such as lobby’s, walkways, andnear computers. Also, sensors shouldbe placed at least at eye level to reducethe effects of “drafts” created by peoplewalking by.

What if I have other wireless systemssuch as for security systems ortelephones? Can they interfere?

Trane Wireless VAV Systems applyspread spectrum technology toaccomplish wireless communication.Spread spectrum technology enhancessystem security and allows the systemto operate in the same environment asother systems using the same frequen-cies. Upon reception, the receiver“unspreads” the signal and reads theinformation. Any receiver that does nothave a matching encoding sequencecan not unspread the signal and seesthe transmission as RF noise. Thisspreading and unspreading enhancesthe security of the system and its abilityto operate in the same environment asother systems using the same frequen-cies.The sensor simultaneously broadcastsidentical information over two separatefrequencies (911 and 918 MHz) with a 5MHz bandwidth, making interferenceeven less likely.

What about interference due tobuilding construction?

The spread spectrum technology isvery good at finding a way through thebuilding. However, if a building or anarea is enclosed in metal, the signal willmost likely not find a clean path to thereceiver. A large metal plane is the mostdetrimental source of interference andwill most likely block the signal.The signal will also have problemspenetrating steel reinforced concrete.This means that unless there is a largeopening in the floor the signal may notpass from floor to floor and a receivershould be used on each floor. If asystem is configured using theminimum amount of receivers and thetransmissions are getting lost theobvious fix is to add a receiver.

Are there any environmental concerns?

The major environmental concern,regarding batteries is mercury. Thebattery that Trane uses contains nomercury and thus is consideredenvironmentally friendly.

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42 VAV-SVX01B-EN

Commonly Used AcronymsAC Alternating Current

AHU Air Handling Unit

AIP Analog Input

AOP Analog Output

AVG Average

AWG American Wire Gauge

BCU Building Control Unit

BIP Binary Input

BMS Building ManagementSystem

BOP Binary OutputoC Celsius

CCP Central Control Panel

CFM Cubic Feet per Minute

CMS Cubic Meters perSecond

CO2 Carbon Dioxide

COM Communication

CPL Custom ProgramLanguage

CU Command Unit

DDC Direct Digital Control

DEG Degree

DP Differential Pressure

EEPROM Electrically ErasableProgrammable ReadOnly Memory

oF Fahrenheit

Hz Hertz

ICS Integrated Comfort™System

I/O Input/Output

IOP Installation, Operation,and Programming

LED Light Emitting Diode

MAX Maximum

MIN Minimum

NEC National Electric Code

PPM Parts Per Million

PROM Programmable ReadOnly Memory

PWM Pulse Width Modula-tion

RSSI Receiver SignalStrength Indicator

RTD Resistance Tempera-ture Detector

SAP Supply Air Pressure

SAT Supply Air Temperature

TB Terminal Block

TOV Timed Override

TR Time since lasttransmission wasreceived

UCM Unit Control Module

UL Underwriter’s Laboratories

VA Voltage Ampere

VAC Voltage AlternatingCurrent

VAV Variable Air Volume

ZSM Zone Sensor Module

Appendix

CHAPTER 9: APPENDIX

The Trane CompanyAn American Standard Companywww.trane.com

For more information contactyour local district office ore-mail us at [email protected]

Literature Order Number VAV-SVX01B-EN

File Number

Supersedes VAV-SVX01A-EN

Stocking Location La Crosse

Since The Trane Company has a policy of continuous product improvement, it reserves the right to changespecifications and design without notice. Only qualified, experienced personnel should perform installationand servicing of the equipment referred to in this booklet.

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