Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 534-80145 Printed in U.S.A. Form 48/50A-1W Pg 1 2-03 Replaces: NewBook 1 1

Tab 1a 1b

Wiring DiagramsINDEX

ACCESSORIES

NOTE: Accessory wiring is shown on the unit wiring dia-grams. Refer to the appropriate drawing for accessory wiring.The following accessories are shown on the main control boxcircuit drawing (Fig. 8): thermostat, remote economizerposition override, remote economizer minimum position setpoint, remote 4-20 mA economizer position, and space IAQsensor. The following accessories are shown on the auxiliarycontrol box circuit drawing (Fig. 9): outdoor enthalpy

changeover sensor and differential enthalpy changeoversensor. The following accessories are shown on the accessoryboard wiring drawing (Fig. 10): outdoor air quality sensor,remote supply air set point, demand limit controller, outdoorinlet cfm sensor, fan status switch, demand limit-redline,demand limit-loadshed, fire pressurization, fire evacuation, firesmoke purge, and IAQ override switch.

ELECTRIC HEAT POWER DIAGRAMS

NOTE: All power leads connect to (single) TB7 power terminal block– 2 or 3 conductors per terminal.

TYPE UNIT NUMBER FIG. NO.

Component Arrangement48/50AJ,AK,AW,AY020-035 48EJ502489 148/50AJ,AK,AW,AY040-060 48EJ502490 2

Power Schematic

48/50AJ,AK,AW,AY020-027 48EJ503085 348/50AJ,AK,AW,AY030-035 48EJ503084 4

48/50AJ,AK,AW,AY040 48EJ503083 548/50AJ,AK,AW,AY050 48EJ503082 648/50AJ,AK,AW,AY060 48EJ503081 7

Main Control Box Circuit 48/50AJ,AK,AW,AY020-060 48EJ503075 8Auxiliary Control Box Wiring 48/50AJ,AK,AW,AY020-060 48EJ503076 9

Accessory Board Wiring 48/50AJ,AK,AW,AY020-060 48EJ503086 10

Gas Heat Control Circuit(2-Stage Heat)

48AJ,AK,AW,AY020-050 48EJ503079 1148AJ,AK,AW,AY060 48EJ503077 12

Gas Heat Control Circuit(Staged Gas Heat)

48AJ,AW020-050 48EJ502488 1348AJ,AW060 48EJ503078 14

Electric Heat Control Circuit50AJ,AK,AW,AY020-050 48EJ503080 15

50AJ,AK,AW,AY060 48EJ503087 16

ACCESSORY UNIT FIG. NO.

Motormaster® V Low Ambient Controller

48/50AJ,AK,AW,AY020-035 1748/50AJ,AK,AW,AY040-060 18

Space Sensor Temperature Averaging 48/50AJ,AK,AW,AY020-060 19

UNIT SIZES ELEC CHARACTERISTICSNOMINAL kW

FIG. NO. QTY PER UNITLo Heat Hi Heat

020-050

208/230-3-60 36 72 20 2460-3-60380-3-60400-3-50

362427

724954

20 2

575-3-60 36 72 20 2

060

208/230-3-60 54 108 20 3460-3-60380-3-60400-3-50

543741

1087482

20 3

575-3-60 54 108 20 3

48/50AJ,AK,AW,AY020-060Single Package Rooftop

Gas Heating/Electric Cooling and Electric Cooling Unitswith ComfortLink™ Controls

50/60 Hz

2

LEGEND AND NOTES FOR FIG. 1-16

LEGEND

BP — Building PressureC — Contactor, CompressorCAP — CapacitorCB — Circuit BreakerCCB — Control Circuit BreakerCCH — Crankcase HeaterCCN — Carrier Communication NetworkCOMP — Compressor MotorCR — Control RelayCS — Compressor SafetyCSB — Current Sensing BoardDP — Duct PressureDS — Disconnect SwitchEC — Enthalpy ControlECB — Economizer Control BoardEDT — Evaporator Discharge Temperature SensorEMM — Controls Option BoardEQUIP — EquipmentFIOP — Factory-Installed OptionFU — FuseGND — GroundHC — Heater ContactorHIR — Heat Interlock RelayHPS — High-Pressure SwitchHS — Hall Effect SensorIAQ — Indoor Air QualityIDM — Induced Draft MotorIFC — Indoor Fan ContactorIFCB — Indoor Fan Circuit BreakerIFM — Indoor Fan MotorIFR — Indoor Fan RelayIGC — Integrated Gas Unit ControllerIP — Internal ProtectorL — LightLAT — Leaving Air Temperature SensorLPT — Low Pressure TransducerLS — Limit SwitchMBB — Main Base BoardMGV — Main Gas ValveNEC — National Electrical CodeOARH — Outdoor-Air Relative HumidityOAT — Outdoor-Air Temperature SensorOFC — Outdoor Fan ContactorOFM — Outdoor Fan MotorPEC — Power Exhaust ContactorPEM — Power Exhaust MotorPL — Plug AssemblyPRI — PrimaryR — RelayRARH — Return Air Relative HumidityRAT — Return Air Temperature SensorRS — Rollout SwitchSCB — Staged Gas BoardSCT — Saturated Condensing Temperature SensorSGC — Staged Gas ControllerSST — Saturated Suction Pressure TransducerTB — Terminal BlockTC — Thermostat CoolingTH — Thermostat HeatingTRAN — TransformerVFD — Variable Frequency Drive

Terminal Block

Terminal (Unmarked)

Terminal (Marked)

Splice

Factory Wiring

Field Wiring

To indicate common potential only, not to repre-sent wiring.

To indicate FIOP or Accessory

PLUG LOCATION REFERENCE

NOTES:1. Factory wiring is in accordance with the national electrical codes. Any field

modifications or additions must be in compliance with all applicable codes.2. Use 75° C min wire for field power supply, use copper wires for all units.3. All circuit breakers “Must Trip Amps” are equal to or less than 156% RLA.4. Compressor and fan motors are thermally protected — three phase motors

protected against primary single phase conditions.5. Red jumper wire must be added between R and WI for Space Temperature

mode and temporarily during Service-Test mode when the heaters need tooperate.

NAME LOCATION DESCRIPTIONPL1 MAIN CB Communications from MMB to PL5/PL4PL2 MAIN CB Smoke Detector & 24V from TB5 to AUX CBOX

PL3 MAIN CB Heat Control & 24V from MBB to PL9PL4 MAIN CB Communications from OL1 to SCB/EMMPL5 AUX CB Communications from PL1 to ECB1 & ECB2

PL6 AUX CB REM/OCC from PL7 to ECB1PL7 MAIN CB REM/OCC from TB5/6 to PL6/12PL8 AUX CB ECM Control from PL12 to ECB1

PL9 ELEC HEAT Control from PL3 to IGC/HR/PL14PL10 GAS HEAT IDM Line Voltage from PL11 to IDM(CAP)PL11 MAIN CB Line Voltage from OFC2 to PL10 (IDM)

PL12 AUX CB Branch from PL2,7,8 to PL13,18,19,20PL13 AUX CB Smoke Det. Control from PL12 to Smoke Det.PL14 ELEC HEAT Control Power to Heater Box 1

PL15 ELEC HEAT Control Power to Heater Box 2PL16 ELEC HEAT Control/Signal from PL12 to EconomizerPL18 AUX CB Control/Signal from PL12 to CO2 Sensor

PL19 AUX CB Control/Signal from PL12 to EconomizerPL20 AUX CB 24V Power from PL12 to ECB1/ECB2PL21 AUX CB 24V Power from PL20 to ECB1/PEC

PL22 MAIN CB Line Voltage from CCB to PECPL23 AUX CB Pwr. Exh. from PEC to PL24,25,26,27PL24 AUX CB PEM Pwr. from PL23

PL25 AUX CB PEM Pwr. from PL23PL26 AUX CB PEM Pwr. from PL23PL27 AUX CB PEM Pwr. from PL23

PL28 MAIN CB Thermistor Input from MMB to PL29/PL30PL29 EVAP SECT SAT HarnessPL30 AUX CB OAT/RAT Harness

PL31 MAIN CB HPS/SSTPL33 MAIN CB Crankcase HeatersPL34 MAIN CB SCT

PL35 EVAP SECT Hot Gas By-Pass Harness

3

SEQUENCE OF OPERATION

Constant Volume (CV) Units — On power up, thecontrol module will activate the initialization software. Theinitialization software will determine the unit configuration andalso initialize any controls loops and input/output devices. Allalarms and configurations are saved in memory and maintainedduring power outages. All alarms will be maintained inmemory and must be cleared through the Scrolling Marqueedisplay.

The unit can be configured with two different control types:thermostat control or space temperature sensor control.THERMOSTAT CONTROL — If the unit is equipped with athermostat with Y1, Y2, W1, W2 and G connections, then thecontrol will perform the following sequence.

When terminal G is energized, the indoor fan will turn on.The fan must be running for heating or cooling to occur. If Y1is closed (first stage of cooling is energized), then the unitcontrol will first check the ability to use the economizer. If theeconomizer can be used, then the unit control will modulate thedamper open to maintain the low-load economizer leaving airtemperature set point.

If Y2 closes (second stage of cooling is energized), then theunit control will lower the leaving air temperature set point tothe configured set point. If the economizer cannot satisfy theload, then the compressors will be sequenced on to maintaineither the low or high load temperature set points. If theeconomizer cannot be used or the enable control disables theeconomizer, then the control will sequence the compressorsbased on the Y1 and Y2 signals.

If two-stage control has been selected, then the unit controlwill map the compressors to the Y1 and Y2 inputs (first andsecond stage cooling) as defined in the loading sequence. IfAdaptive mode has been selected, then the control will add andremove compressor stages to maintain the high and lowdemand set points. If Y1 is closed (first stage of coolingenergized), at least one compressor stage will be turned on.

If W1 closes (first stage of heating is energized), then theunit will be in the Heating mode. The economizer will beclosed to the minimum position. If the unit is equipped withgas or electric heat, then the first stage of heat will beenergized. If W2 closes, then the unit control will turn on thesecond stage of heat. If the unit is equipped with a staged gasheat control option, then the W1 and W2 signal will be used tocontrol the gas heat to the configurable low and high heat loadleaving air temperature set points. If the unit is equipped withgas heat, then the IGC board will control the operation of thegas heat. See the Gas Heat Unit Operation section for the IGCboard sequence of operation. SPACE TEMPERATURE SENSOR CONTROL — If spacetemperature operation has been selected using a T55, T56, orT58 sensor, then a wire jumper must be added between R, W1,and W2. If a remote occupancy control method has beenselected, then the remote occupancy input must first be closedfor the unit to go into heat, vent, or cooling modes. If theinternal timeclock is used, the unit control module determinesthe occupancy state based on the system time schedules.

If Temperature Compensated Start is active, the unit willbe controlled as in the occupied mode. The TemperatureCompensated Start function will start the unit before thescheduled occupied time (as determined by prior operation) tobring the space to the set point temperature when occupiedtime starts. As an example, if the unoccupied set point is 60 F,the occupied set point is 72 F, and the occupied time periodstarts at 8:00 AM, the Temperature Compensated Start functionwill bring on the unit at 7:45 AM (as determined from previous

operation) so the room temperature will be at 72 F when theoccupied time starts.

If the unit has been configured for a pre-occupancy purge,then the control will start the unit in Vent mode prior to theoccupancy time to vent the space. If an IAQ (indoor air quality)sensor is being used and the low IAQ set point is satisfied, thenthe occupancy Purge mode will be terminated.

The set points for heat and cooling are configurable throughthe Scrolling Marquee display.NOTE: If a T56 sensor is being used, then the slide bar on thesensor can offset the set point by has much as 5 degrees.

If the space temperature rises above the cooling set point,then the unit will go into Cooling mode. If the economizer canbe used, the control will first try to control to the LeavingAir Temperature set point. The set point will depend on thespace temperature. If the temperature is above the LowDemand set point, then the Low Economizer Load DischargeAir Temperature set point will be used. If the temperature isabove the High Load Space Temperature set point, then theHigh Load Leaving Air Temperature set point will be used. Ifthe economizer cannot satisfy the load the compressors willbe sequenced on to maintain either the low or high loadtemperature set points. If the economizer cannot be used or theunit control disables the economizer, then the unit control willsequence the compressors based on the low and high loadspace temperature variables. If two-stage control has beenselected then the control will map the compressors to the lowand high loads as defined in the loading sequence. If Adaptivemode has been selected then the control will add and removecompressors stages to maintain the low and high demandleaving air set points.

If the load goes below the heating space temperature setpoints, the Heating mode will initiate. The economizer will beclosed to the minimum position and (if the unit is equippedwith gas or electric heat) the first stage of heat will beenergized. If the space temperature goes below the High LoadSpace Temperature set point then the control will turn on thesecond stage of heat. If the unit is equipped with a staged gasheat control option then the low load and high load demandsignal will control the Leaving Air Temperature set point andwill turn on heating stages to maintain the Leaving AirTemperature set points.

If the unit is configured for unoccupied free cooling, me-chanical cooling, or heating and the room temperature goesabove or below the unoccupied configuration set points, thenthe unit control will turn on free cooling, mechanical cooling,or heat as needed to return room temperature within theunoccupied set points. When in this mode, the economizerdampers will be maintained fully closed or to the minimumunoccupied ventilation set point.

Variable Air Volume Control — On power up, thecontrol module will activate the initialization software. Theinitialization software will determine the unit configuration andalso initialize any controls loops and input/output devices. Allalarms and configurations are saved in memory and maintainedduring power outages. All alarms will be maintained inmemory and must be cleared through the Scrolling Marqueedisplay.

The unit will first determine the mode of operation. If theunit has been configured for space temperature demand thenthe control will determine, based on the configurable set points,if the unit should be in the Heat mode, Vent mode or Coolingmode. If the unit is configured for return air temperaturecontrol, then the unit control will start the fan and monitor thereturn air temperature against the configurable set point todetermine if the unit should be in cooling, vent or heatingmode.

4

If the control is connected to a ComfortID™ system, theroom terminals are equipped with microprocessor controls thatgive commands to the base module. If linkage is active, thecontrol module will replace local ComfortLink™ set pointsand occupancy data with linkage supplied data.

If Temperature Compensated Start is active, then the unitcontrol will start the unit in advance of the occupied time topre-cool or heat the space. If the unit is configured to use apre-purge cycle, then the control will start the unit in vent modebased on a pre-start time interval. If an IAQ (indoor air quality)sensor is being used and the low IAQ control point is satisfiedthen the mode will be terminated. The mode terminates whenthe occupied period starts.

If Cooling mode is required, then the controlling set pointwill be the Leaving Evaporator Air Temperature set point. If aneconomizer is present and the changeover control allows theeconomizer to be used, then the control will first attempt tocontrol the leaving evaporator air temperature using freecooling. If this cannot satisfy the load then additionalcompressor stages will be turned on to maintain the leaving airtemperature. When both compressors and the economizer arebeing used, the unit control will use the economizer dampers tomaintain better control of the leaving air and to prevent highcompressor cycling. If the economizer cannot be used, then itwill be set to the minimum vent position.

If the unit is equipped with an optional hot gas bypass valve,then the unit control will use hot gas as an additional stage ofcapacity. When the first stage of cooling is required, the unitcontrol will turn on the circuit A compressor and the hot gasbypass valve. When additional cooling is called for, the unitcontrol will turn off the hot gas bypass valve. The valve willalso be used for additional freeze protection of the coils whenlow evaporator refrigerant temperatures are detected using thesuction pressure tranducers.

The unit control will also monitor the supply duct pressureand send a 4 to 20 mA signal to the factory supplied inverter tocontrol the speed of the fan to maintain the user-configuredsupply duct status pressure. If the ComfortLink control is onthe CCN (Carrier Comfort Network) or a building linkagesystem, then the control also supports static pressure resetbased on the needs of the zones.

If the unit has been enabled for occupied heat and if thespace temperature sensor (SPT), return air temperature sensor(RAT), or CCN (in a building linkage system) demand requiresthat the unit be in Heating mode, then the unit control willenergize the electric or gas heat to warm the space. In thismode, the unit control will energize the heat interlock relay(HIR). Note that for the linkage systems the interlock relayconnection is not required. Once the mode is enabled, the unitcontrol will use up to 2 stages of heat to control to the return airtemperature set point. Heating will continue until the returntemperature set point is satisfied. If the unit is configured formorning warm-up and the heating demand is below the setpoint during the first 10 minutes of operation, then the unitcontrol will energize full heating capacity until the return airtemperature set point is satisfied.

Gas Heat Unit Operation — The gas heat units incor-porate 2 (3 on size 060) separate systems to provide gas heat.Each system incorporates its own induced-draft motor,Integrated Gas Control (IGC) board, 2-stage gas valve,manifold, and safeties. The systems are operated in parallel.For example, when there is a call for first stage heat, bothinduced-draft motors operate, both gas valves are energized,and both IGC boards initiate spark. All of the gas heatingcontrol is performed through the IGC boards (located in theheating section).

The MBB (Main Base Board) module board initiates andterminates heating operation and monitors the status of therequirements for indoor fan operation. The fan will becontrolled directly by the MBB board.

When the thermostat or room sensor calls for heating, theMBB board will close heating relays and send power to W oneach of the IGC boards. An LED on the IGC board will be onduring normal operation. A check is made to ensure that therollout switches and limit switches are closed and the induced-draft motors are not running. After the induced-draft motors areenergized and speed is proven with the Hall Effect sensor onthe motor, the ignition activation period begins. The burnerswill ignite within 5 seconds. When ignition occurs the IGCboard will continue to monitor the condition of the rollout andlimit switches, the Hall Effect sensor and the flame sensor.

If the unit is controlled through a room thermostat set forfan auto., 45 seconds after ignition occurs the indoor-fan motorwill be energized and the outdoor-air dampers will open totheir minimum position. If the over-temperature limit opensprior to the start of the indoor-fan blower, on the next attemptthe 45-second delay will be shortened to 5 seconds less than thetime from initiation of heat to when the limit tripped. Gas willnot be interrupted to the burners and heating will continue.Once modified, the fan on delay will not change back to45 seconds unless power is reset to the control.

If the unit is controlled through a room sensor, the indoorfan will operate in the occupied mode and the outdoor-airdampers will be at the minimum position. In the unoccupiedmode, the indoor fan will be energized through the IGC boardwith a 45-second delay and the outside-air dampers will moveto the minimum unoccupied set point.

When additional heat is required, the second stage MBBoutput relay closes and initiates power to the second stage of allmain gas valves in all sections. When the demand is satisfied,MBB heat output relays will open and the gas valves closeinterrupting the flow of gas to the main burners.

If the call for stage 1 heat lasts less than 1 minute, theheating cycle will not terminate until 1 minute after W1became active. If the unit is configured for intermittent fan thenthe indoor-fan motor will continue to operate for an additional45 seconds then stop and the outdoor-air dampers will close. Ifthe over temperature limit opens after the indoor motor isstopped within 10 minutes of W1 becoming inactive, on thenext cycle the time will be extended by 15 seconds. Themaximum delay is 3 minutes. Once modified, the fan off delaywill not change back to 45 seconds unless power is reset to thecontrol.

Indoor Air Quality — The Indoor Air Quality (IAQ)function provides a demand-based control for ventilation airquantity, by providing a modulating outside air damperposition that is proportional to space CO2 level. The ventilationdamper position is varied between a minimum ventilation level(based on internal sources of contaminants and CO2 levelsother than the effect of people) and the maximum designventilation level (determined at maximum populated status inthe building). During a less-than-fully populated space period,the CO2 level will be lower than maximum design ventilationlevel at full-load design condition, thus less ventilation air willbe required. Reduced quantities of ventilation air will result inreduced operating costs. Space CO2 level is monitored andcompared to user-configured set points. An accessory CO2sensor for space (or return duct mounting) is required. The IAQroutine can be enhanced by also installing a sensor for OutdoorAir Quality (OAQ).

5

During the occupied period in the absence of a demand forcooling using outside air, if CO2 level is below the set point forthe minimum ventilation level, the outside-air damper will beopened to and maintained at the minimum ventilation leveldamper position set point.

When the space CO2 level exceeds set point for the mini-mum ventilation level condition, the ComfortLink™ controlwill begin to open the outside air damper position to admitmore ventilation air and remove the additional contaminants.As the space CO2 level approaches the set point for maximumdesign ventilation level condition, the outside air damperposition will reach the maximum ventilation level damperposition set point limit. Damper position will be modulated in adirectly proportional relationship between these two CO2 setpoint limits and their corresponding damper position limits.

In most applications a fixed reference value can be set forthe outdoor air quality level, but the control also supports theaddition of an outside air quality sensor that will then becompared to the indoor or return IAQ sensor. If an OAQ sensoris connected, the demand set point levels will be adjustedautomatically as the outdoor CO2 levels vary. Also, if theoutdoor CO2 level exceeds a user-configured maximum limitvalue, then outside air damper position will be limited to theminimum ventilation damper set point value. The unit controlcan also receive these signals through the Carrier ComfortNetwork (CCN).

The IAQ and OAQ measurement levels are displayed bythe ComfortLink™ control in parts per million (PPM).

6

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IN 3

10K

ther

mis

tor

RA

TR

etur

n ai

r te

mpe

ratu

re10

K T

herm

isto

rA

N5

J8, 9

-10

9 (

ther

mis

tor,

ohm

s)A

IN4

10K

ther

mis

tor

ED

TE

vapo

rato

r D

isch

arge

Air

Tem

pera

ture

10K

The

rmis

tor

AN

6J8

, 11-

1211

(th

erm

isto

r, oh

ms)

AIN

510

K th

erm

isto

rO

AT

Out

door

air

tem

pera

ture

10K

The

rmis

tor

AN

7J8

, 13-

1413

(th

erm

isto

r, oh

ms)

AIN

610

K th

erm

isto

rS

PT

Spa

ce te

mpe

ratu

re (

T55

/56)

10K

The

rmis

tor

AN

8J8

, 1-2

1 (

ther

mis

tor,

ohm

s)A

IN7

10K

ther

mis

tor

(T55

cur

ve)

SP

TOS

pace

tem

pera

ture

offs

et (

T56

)10

K T

herm

isto

rA

N9

J8, 3

-43

(th

erm

isto

r, oh

ms)

AIN

810

0K P

ot (

T56

slid

er)

IAQ

, IA

QM

INO

VIA

Q a

nalo

g in

put

4-20

ma

AN

10J8

, 5-6

5 (

ther

mis

tor,

ohm

s)A

IN 9

mu

lti-u

se 4

-20m

A w

ith r

esis

tor

FLT

SF

ilter

Sta

tus

Sw

itch

Inpu

tA

N11

J8, 7

-87

(th

erm

isto

r, oh

ms)

AIN

10

gold

-pla

ted

switc

h, p

rogr

amm

able

sen

seO

UT

PU

TS

CM

PB

2C

ompr

esso

r B

2R

elay

RLY

1J1

0, 2

0-21

20 =

RLY

1A (

=R

LY2A

), 2

1 =

RLY

1B1

= C

lose

s R

LY1A

/ R

LY1B

P6.

00=

com

pres

sor

OF

F

1=

com

pres

sor

ON

CM

PB

1C

ompr

esso

r B

1R

elay

RLY

2J1

0, 2

2-23

22 =

RLY

2A (

=R

LY1A

), 2

3 =

RLY

2B1

= C

lose

s R

LY2A

/ R

LY2B

P6.

10=

com

pres

sor

OF

F

1=

com

pres

sor

ON

CM

PA2

Com

pres

sor

A2

Rel

ayR

LY 3

J10,

24-

2524

= R

LY3A

(=

RLY

4A),

25

= R

LY3B

1 =

Clo

ses

RLY

3A /

RLY

3BP

6.2

0=co

mpr

esso

r O

FF

1

=co

mpr

esso

r O

NC

MPA

1C

ompr

esso

r A

1R

elay

RLY

4J1

0, 2

6-27

26 =

RLY

4A (

=R

LY3A

), 2

7 =

RLY

4B1

= C

lose

s R

LY4A

/ R

LY4B

PB

.00=

com

pres

sor

OF

F

1=

com

pres

sor

ON

CO

ND

FAN

BC

onde

nser

fan

BR

elay

RLY

5J1

0, 1

0-11

10 =

RLY

5A (

=R

LY6A

), 1

1 =

RLY

5B1

= C

lose

s R

LY5A

/ R

LY5B

PB

.10=

fan

OF

F

1=

fan

ON

CO

ND

FAN

AC

onde

nser

fan

AR

elay

RLY

6J1

0, 1

2-13

12 =

RLY

6A (

=R

LY5A

), 1

3 =

RLY

6B1

= C

lose

s R

LY6A

/ R

LY6B

PB

.20=

fan

OF

F

1=

fan

ON

HS

2H

eat s

tage

2R

elay

RLY

7J1

0, 1

4-16

14 =

15

= R

LY7A

, 16

= R

LY7B

1 =

Clo

ses

RLY

7A /

RLY

7BP

B.3

0=st

age

OF

F

1=

stag

e O

NH

S1

Hea

t sta

ge 1

Rel

ayR

LY 8

J10,

17-

1917

=1

8 =

RLY

8A, 1

9 =

RLY

8B1

= C

lose

s R

LY8A

/ R

LY8B

PB

.40=

stag

e O

FF

1

=st

age

ON

HIR

Hea

t int

erlo

ck r

elay

Rel

ayR

LY 9

J10,

4-6

4 =

5 =

RLY

9A, 6

= R

LY9B

1 =

Clo

ses

RLY

9A /

RLY

9BP

B.5

0=re

lay

OF

F

1=

rela

y O

NS

FS

uppl

y fa

nR

elay

RLY

10

J10,

7-9

7 =

8 =

RLY

10A

, 9 =

RLY

10B

1 =

Clo

ses

RLY

10A

/ R

LY10

BP

B.6

0=fa

n O

FF

1

=fa

n O

NA

LR

MA

larm

out

put r

elay

Rel

ayR

LY 1

1J1

0, 1

-31

= 2

= R

LY11

A, 3

= R

LY11

B1

= C

lose

s R

LY11

A /

RLY

11B

PB

.70=

rela

y O

FF

1

=re

lay

ON

PO

INT

NA

ME

PO

INT

DE

SC

RIP

TIO

NI/O

TY

PE

I/O P

OIN

T N

AM

EC

ON

NE

CTO

RP

IN N

O.

SIG

NA

L P

IN(S

)P

OR

T S

TAT

E D

ETA

ILP

OR

T D

ES

IGN

AT

ION

PO

INT

INT

ER

PR

ETA

TIO

N

INP

UT

SR

MT

INR

emot

e oc

cupa

ncy

Sw

itch

DI1

J4, 1

-22

24VA

C =

1, 0

VA

C =

0P

4.5

prog

ram

mab

le s

ense

EN

TH

Eco

nom

izer

ena

ble

Sw

itch

DI2

J4, 3

-44

24VA

C =

1, 0

VA

C =

0P

4.4

prog

ram

mab

le s

ense

RA

RH

Ret

urn

air

rela

tive

hum

idity

4-20

ma

AN

1J5

, 1-3

1=24

VD

C, 2

=0-

20m

A in

, 3=

GN

D

0-2

0mA

AN

54-

20m

A s

enso

rO

AR

HO

utdo

or a

ir re

lativ

e hu

mid

ity4-

20m

aA

N2

J5, 4

-64=

24V

DC

, 5=

0-20

mA

in, 6

=G

ND

0

-20m

A A

N4

4-20

mA

sen

sor

OU

TP

UT

SE

CO

NO

CM

DE

cono

miz

er a

ctua

tor

(ana

log

cont

rol)

4-20

ma

AO

1J9

, 1-2

1=0-

20m

A, 2

=G

ND

0-20

mA

OU

TP

7.7/

DA

14m

A=0

%

20m

A=1

00%

EC

ON

OC

MD

Eco

nom

izer

act

uato

r (d

igita

l con

trol

)di

gita

lP

P/M

PJ7

, 1-3

1=

PP

/MP

Dat

a, 2

=24V

AC

, 3=

GN

D B

elim

o P

P/M

P P

roto

col

ac

tuat

or c

ontr

ol v

ia P

PP

E_A

Pow

er E

xhau

st s

tage

Are

lay

RLY

1J8

, 1-3

1 =

2 =

RLY

1A, 3

= R

LY1B

1 =

Clo

ses

RLY

1A /

RLY

1BP

2.0

0=st

age

OF

F

1=

stag

e O

NP

E_B

Pow

er E

xhau

st s

tage

Bre

lay

RLY

2J8

, 4-6

4 =

5 =

RLY

2A, 6

= R

LY2B

1 =

Clo

ses

RLY

2A /

RLY

2BP

2.1

0=st

age

OF

F

1=

stag

e O

NP

E_C

Pow

er E

xhau

st s

tage

Cre

lay

RLY

3J8

, 7-9

7 =

8 =

RLY

3A, 9

= R

LY3B

1 =

Clo

ses

RLY

3A /

RLY

3BP

2.2

0=st

age

OF

F

1=

stag

e O

NE

CO

N_P

WR

E

cono

miz

er P

ower

rela

yR

LY 6

J8, 1

6-18

16 =

17

= R

LY6A

, 18

= R

LY6B

1 =

Clo

ses

RLY

6A /

RLY

6BP

2.5

0=ac

tuat

or O

FF

1

=ac

tuat

or O

N

7

INP

UT

/OU

TP

UT

CH

AN

NE

L D

ES

IGN

AT

ION

S —

VA

V C

ON

TR

OL

BO

AR

D (

EC

B2)

INP

UT

/OU

TP

UT

CH

AN

NE

L D

ES

IGN

AT

ION

S —

ST

AG

ED

HE

AT

CO

NT

RO

L B

OA

RD

INP

UT

/OU

TP

UT

CH

AN

NE

L D

ES

IGN

AT

ION

S —

CO

NT

RO

LS

OP

TIO

N B

OA

RD

PO

INT

NA

ME

PO

INT

DE

SC

RIP

TIO

NI/O

TY

PE

I/O P

OIN

T N

AM

EC

ON

NE

CTO

RP

IN N

O.

SIG

NA

L P

IN(S

)P

OR

T S

TAT

E D

ETA

ILP

OR

T D

ES

IGN

AT

ION

PO

INT

INT

ER

PR

ETA

TIO

N

INP

UT

S

not u

sed

DI1

J4, 1

-22

24VA

C =

1, 0

VA

C =

0P

4.5

no

t use

dD

I2J4

, 3-4

424

VAC

= 1

, 0V

AC

= 0

P4.

4B

PB

uild

ing

stat

ic p

ress

ure

4-20

ma

AN

1J5

, 1-3

1=24

VD

C, 2

=0-

20m

A in

, 3=

GN

D

0-2

0mA

AN

54-

20m

A p

ress

ure

tran

smitt

er

SP

Sup

ply

Duc

t sta

tic p

ress

ure

4-20

ma

AN

2J5

, 4-6

4=24

VD

C, 5

=0-

20m

A in

, 6=

GN

D

0-2

0mA

AN

44-

20m

A p

ress

ure

tran

smitt

er

OU

TP

UT

SS

FAN

_VF

DS

uppl

y Fa

n In

vert

er s

peed

4-20

ma

AO

1J9

, 1-2

1=0-

20m

A, 2

=G

ND

0-20

mA

OU

TP

7.7/

DA

14m

A=

0Hz

2

0mA

=m

ax H

z

not u

sed

PP

/MP

J7, 1

-3 1

=P

P/M

P D

ata,

2=

24V

AC

, 3=

GN

D B

elim

o P

P/M

P P

roto

col

not u

sed

RLY

1J8

, 1-3

1 =

2 =

RLY

1A,

3

= R

LY1B

1 =

Clo

ses

RLY

1A /

RLY

1BP

2.0

0=P

E s

tage

4 O

FF

1

=P

E s

tage

4 O

N

not u

sed

RLY

2J8

, 4-6

4 =

5 =

RLY

2A,

6 =

RLY

2B1

= C

lose

s R

LY2A

/ R

LY2B

P2.

10=

PE

sta

ge 5

OF

F

1=

PE

sta

ge 5

ON

no

t use

dR

LY 3

J8, 7

-97

= 8

= R

LY3A

,

9 =

RLY

3B1

= C

lose

s R

LY3A

/ R

LY3B

P2.

20=

PE

sta

ge 6

OF

F

1=

PE

sta

ge 6

ON

HG

BP

VH

ot G

as B

ypas

s V

alve

rela

yR

LY 6

J8, 1

6-18

16 =

17

= R

LY6A

, 1

8 =

RLY

6B1

= C

lose

s R

LY6A

/ R

LY6B

P2.

5

PO

INT

NA

ME

PO

INT

DE

SC

RIP

TIO

NI/O

TY

PE

I/O P

OIN

T N

AM

EC

ON

NE

CTO

RP

IN N

O.

SIG

NA

L P

IN(S

)P

OR

T S

TAT

E D

ETA

ILP

OR

T D

ES

IGN

AT

ION

PO

INT

INT

ER

PR

ETA

TIO

N

INP

UT

S

not u

sed

AN

1J5

, 1-3

1=5v

, 2=

Vin

, 3=

GN

D

(th

erm

isto

r 1-

2)(0

-5V

DC

, the

rmis

tor,

ohm

s)U

12,A

IN0

not u

sed

AN

2J5

, 4-6

4=5v

, 5=

Vin

, 6=

GN

D

(th

erm

isto

r 4-

5)(0

-5V

DC

, the

rmis

tor,

ohm

s)U

12,A

IN1

S

AT

1S

uppl

y ai

r te

mpe

ratu

re 1

10K

ther

mis

tor

AN

3J5

, 7-9

7=5v

, 8=

Vin

, 9=

GN

D

(th

erm

isto

r 7-

8)(0

-5V

DC

, the

rmis

tor,

ohm

s)U

12,A

IN2

10K

ther

mis

tor

SA

T2

Sup

ply

air

tem

pera

ture

210

K th

erm

isto

rA

N4

J5, 1

0-12

10=

5v, 1

1=V

in, 1

2=G

ND

(

ther

mis

tor

10-1

1)(0

-5V

DC

, the

rmis

tor,

ohm

s)U

12,A

IN3

10K

ther

mis

tor

SA

T3

Sup

ply

air

tem

pera

ture

310

K th

erm

isto

rA

N5

J5, 1

3-15

13=

5v, 1

4=V

in, 1

5=G

ND

(

ther

mis

tor

13-1

4)(0

-5V

DC

, the

rmis

tor,

ohm

s)U

12,A

IN4

10K

ther

mis

tor

no

t use

dA

N6

J6, 1

-31=

5v, 2

=V

in, 3

=G

ND

(

ther

mis

tor

1-2)

(0-5

VD

C, t

herm

isto

r, oh

ms)

U12

,AIN

5

no

t use

dA

N7

J6, 4

-64=

5v, 5

=V

in, 6

=G

ND

(

ther

mis

tor

4-5)

(0-5

VD

C, t

herm

isto

r, oh

ms)

U12

,AIN

6

not u

sed

AN

8J6

, 7-9

7=5v

, 8=

Vin

, 9=

GN

D

(th

erm

isto

r 7-

8)(0

-5V

DC

, the

rmis

tor,

ohm

s)U

12,A

IN7

no

t use

dA

N9

J7, 1

-21

(th

erm

isto

r, oh

ms)

U12

,AIN

8

not u

sed

AN

10J7

, 3-4

3 (

ther

mis

tor,

ohm

s)U

12,A

IN9

OU

TP

UT

S

not u

sed

AO

1J8

, 1-2

1=0-

20m

A,

2=

GN

D0-

20m

A O

UT

U7,

P1-

4

not u

sed

AO

2J8

, 3-4

3=0-

20m

A,

4=

GN

D0-

20m

A O

UT

U7,

P7-

6H

S3

Hea

t Sta

ge 3

Rel

ayR

LY1

J9, 1

-31

= 2

= R

LY1A

,

3 =

RLY

1B1

= C

lose

s R

LY1A

/ R

LY1B

U7,

P8-

5 0

=st

age

OF

F

1=

stag

e O

NH

S4

Hea

t Sta

ge 4

Rel

ayR

LY 2

J9, 4

-64

=5

= R

LY2A

,

6 =

RLY

2B1

= C

lose

s R

LY2A

/ R

LY2B

U7,

P8-

4 0

=st

age

OF

F

1=

stag

e O

NH

S5

Hea

t Sta

ge 5

Rel

ayR

LY 3

J9, 7

-97

= 8

= R

LY3A

,

9 =

RLY

3B1

= C

lose

s R

LY3A

/ R

LY3B

U7,

P8-

3 0

=st

age

OF

F

1=

stag

e O

NH

S6

Hea

t Sta

ge 6

Rel

ayR

LY 4

J9, 1

0-12

10 =

11

= R

LY4A

, 1

2 =

RLY

4B1

= C

lose

s R

LY4A

/ R

LY4B

U7,

P8-

2 0

=st

age

OF

F

1=

stag

e O

N

R

LY 5

J9, 1

3-15

13 =

14

= R

LY5A

, 1

5 =

RLY

5B1

= C

lose

s R

LY5A

/ R

LY5B

U7,

P8-

1 0

=st

age

OF

F

1=

stag

e O

N

PO

INT

NA

ME

PO

INT

DE

SC

RIP

TIO

NT

YP

E O

F I/

OI/O

PO

INT

NA

ME

CO

NN

EC

TOR

PIN

NO

.S

IGN

AL

PIN

(S)

STA

TE

vs

CO

NT

RO

LP

OR

T D

ES

IGN

AT

ION

PO

INT

INT

ER

PR

ETA

TIO

N

INP

UT

SS

FS

Sup

ply

Fan

Sta

tus

switc

hS

witc

hD

I 1J7

, 1-2

20

= 2

4vac

, 1=

0va

cP

8.0

D

MD

_SW

1D

eman

d Li

mit

- R

edlin

eS

witc

hD

I 2J7

, 3-4

40

= 2

4vac

, 1=

0va

cP

8.1

D

MD

_SW

2D

eman

d Li

mit

- Lo

ad S

hed

Sw

itch

DI 3

J7, 5

-66

0 =

24v

ac, 1

= 0

vac

P8.

2

PR

ES

Fire

Pre

ssur

izat

ion

Sw

itch

DI 4

J7, 7

-88

0 =

24v

ac, 1

= 0

vac

P8.

3

EVA

CF

ire E

vacu

atio

nS

witc

hD

I 5J7

, 9-1

010

0 =

24v

ac, 1

= 0

vac

P8.

4

PU

RG

Sm

oke

Pur

geS

witc

hD

I 6J7

, 11-

1212

0 =

24v

ac, 1

= 0

vac

P8.

5

IAQ

INIn

door

Air

Qua

lity

Ove

rrid

e S

witc

hS

witc

hD

I 7J7

, 13-

1414

0 =

24v

ac, 1

= 0

vac

P8.

6

OA

CF

MO

utsi

de A

ir C

FM

4-20

ma

AN

7J6

, 1-3

2 (1

= lo

op p

ower

) (

0-20

mA

inpu

t)A

IN 9

D

MD

LM

TM

A4-

20m

A D

eman

d Li

mit

4-20

ma

AN

8J6

, 4-6

5 (4

= lo

op p

ower

) (

0-20

mA

inpu

t)A

IN 8

S

AT

RE

SM

A4-

20m

A S

uppl

y A

ir S

etpo

int

4-20

ma

AN

9J6

, 7-9

8 (7

= lo

op p

ower

) (

0-20

mA

inpu

t)A

IN 7

O

AQ

Out

side

Air

CO

2 S

enso

r4-

20 m

a A

N10

J6, 1

0-12

11 (

10 =

loop

pow

er)

(0-

20m

A in

put)

AIN

6

N

ot u

sed

AN

1J5

, 1-2

1(t

herm

isto

r, oh

ms)

AIN

5

N

ot u

sed

AN

2J5

, 3-4

3(t

herm

isto

r, oh

ms)

AIN

4

N

ot u

sed

AN

3J5

, 5-6

5(t

herm

isto

r, oh

ms)

AIN

3

N

ot u

sed

AN

4J5

, 7-8

7(t

herm

isto

r, oh

ms)

AIN

2

N

ot u

sed

AN

5J5

, 9-1

09

(the

rmis

tor,

ohm

s)A

IN1

Not

use

d A

N6

J5, 1

1-12

11(t

herm

isto

r, oh

ms)

AIN

0

8

CO

NT

RO

LS O

PT

ION

BO

AR

D

Fig

. 1 —

Co

mp

on

ent

Arr

ang

emen

t —

48/

50A

J,A

K,A

W,A

Y02

0-03

5 U

nit

s

9

CO

NT

RO

LS O

PT

ION

BO

AR

D

Fig

. 2 —

Co

mp

on

ent

Arr

ang

emen

t —

48/

50A

J,A

K,A

W,A

Y04

0-06

0 U

nit

s

10

Fig

. 3 —

Po

wer

Sch

emat

ic —

48/

50A

J,A

K,A

W,A

Y02

0-02

7 U

nit

s

11

Fig

. 4 —

Po

wer

Sch

emat

ic —

48/

50A

J,A

K,A

W,A

Y03

0-03

5 U

nit

s

12

Fig

. 5 —

Po

wer

Sch

emat

ic —

48/

50A

J,A

K,A

W,A

Y04

0 U

nit

s

13

Fig

. 6 —

Po

wer

Sch

emat

ic —

48/

50A

J,A

K,A

W,A

Y05

0 U

nit

s

14

Fig

. 7 —

Po

wer

Sch

emat

ic —

48/

50A

J,A

K,A

W,A

Y06

0 U

nit

s

15

Fig

. 8 —

Mai

n C

on

tro

l Bo

x C

ircu

it —

48/

50A

J,A

K,A

W,A

Y02

0-06

0 U

nit

s

16

Fig

. 9 —

Au

xilia

ry C

on

tro

l Bo

x W

irin

g —

48/

50A

J,A

K,A

W,A

Y02

0-06

0 U

nit

s

17

Fig

. 10

— A

cces

sory

Bo

ard

Wir

ing

— 4

8/50

AJ,

AK

,AW

,AY

020-

060

Un

its

18

Fig

. 11

— G

as H

eat

Co

ntr

ol C

ircu

it (

2-S

tag

e H

eat)

— 4

8/50

AJ,

AK

,AW

,AY

020-

050

Un

its

19

Fig

. 12

— G

as H

eat

Co

ntr

ol C

ircu

it (

2-S

tag

e H

eat)

— 4

8/50

AJ,

AK

,AW

,AY

060

Un

its

20

Fig

. 13

— G

as H

eat

Co

ntr

ol C

ircu

it (

Sta

ged

Gas

Hea

t) —

48/

50A

J,A

W02

0-05

0 U

nit

s

21

Fig

. 14

— G

as H

eat

Co

ntr

ol C

ircu

it (

Sta

ged

Gas

Hea

t) —

48A

J,A

W06

0 U

nit

s

22

Fig

. 15

— E

lect

ric

Hea

t C

on

tro

l Cir

cuit

— 5

0AJ,

AK

,AW

,AY

020-

050

Un

its

23

Fig

. 16

— E

lect

ric

Hea

t C

on

tro

l Cir

cuit

— 5

0AJ,

AK

,AW

,AY

060

Un

its

24

BLK

23

GRNDPA

RED

BLK

GRN

RED

A

B

6 5 2

L1

L1

L1

T1

T2

T3

SEE NOTE 1

1 2

BLK

YEL

BLU

FUSE

FUSE

FUSE

MM-FCCB

22

2111

12

13

BLK

RED

BLU

1

2

3

OFM2

FR

2 4

FR1 3

C1 C2OFC1

BLK

GRN

RED

BLK

GRN

RED

DPA

MM-F

FUSE

FUSE

FUSE

BLK

YEL

BLU

CCB

11

12

13

21

22

23

2 4

FR

1 2SEE NOTE 1

6 5 2

L1

L1

L1

T1

T2

T3

MM

BLK

RED

BLU

BLK

RED

BLU

1

2

3

1

2

3

OFM1

OFM2

FR1 3

C1 C2OFC1

Fig. 17 — Motormaster V Accessory Wiring — 48/50AJ,AK,AW,AY020-035 Units

NOTES:1. Motormaster® control to be wired directly to CCB

circuit breaker and the OFC1 contactor should beremoved from the wiring.

2. Connect Start relay FR to the following terminals:230-3-60 TB1-TB2460-3-60 TB1-TB2575-3-60 TB1-TB2208-3-60 TB13A-TB2

3. Add FR relay in parallel with OFC1 (see Fig. 8).

Fig. 18 — Motormaster V Accessory Wiring — 48/50AJ,AK,AW,AY040-060 Units

NOTES:1. Motormaster control to be wired directly to CCB cir-

cuit breaker and the OFC1 contactor should beremoved from the wiring.

2. Connect Start relay FR to the following terminals:230-3-60 TB1-TB2460-3-60 TB1-TB2575-3-60 TB1-TB2208-3-60 TB13A-TB2

3. Add FR relay in parallel with OFC1 (see Fig. 8).

LEGENDCCB — Control Circuit BreakerDPA — Duct Pressure TransducerFR — Fan RelayMM — Motormaster VMM-F — Motormaster V FusesOFC — Outdoor-Fan ContactorOFM — Outdoor-Fan MotorTB — Terminal Block

LEGENDCCB — Control Circuit BreakerDPA — Duct Pressure TransducerFR — Fan RelayMM — Motormaster VMM-F — Motormaster V FusesOFC — Outdoor-Fan ContactorOFM — Outdoor-Fan MotorTB — Terminal Block

25

SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION

SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION

Fig. 19 — Space Temperature Averaging Wiring

26

36 kW, 208/230 V, SIZES 020-05054 kW, 208/230 V, SIZE 060

72 kW, 208/230 V, SIZES 020-050108 kW, 208/230 V, SIZE 060

36 kW, 460 V, SIZES 020-05024 kW, 380 V, SIZES 020-05027 kW, 400 V, SIZES 020-050

54 kW, 460 V, SIZE 06037 kW, 380 V, SIZE 06041 kW, 400 V, SIZE 060

36 kW, 575 V, SIZES 020-05054 kW, 575 V, SIZE 060

72 kW, 575 V, SIZES 020-050108 kW, 575 V, SIZE 060

Fig. 20 — Electric Heater Power Diagrams

72 kW, 460 V, SIZES 020-05049 kW, 380 V, SIZES 020-05054 kW, 400 V, SIZES 020-050

108 kW, 460 V, SIZE 06074 kW, 380 V, SIZE 06082 kW, 400 V, SIZE 060

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 534-80145 Printed in U.S.A. Form 48/50A-1W Pg 28 2-03 Replaces: NewBook 1 1

Tab 1a 1b

Copyright 2003 Carrier Corporation