Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 563-749 Printed in U.S.A. Form 38AH-3W Pg 1 1-00 Replaces: NewBook 1

Tab 3a

Wiring DiagramsUNITS PRODUCED AFTER APRIL 1994

(Includes Motormaster® III Head Pressure Control Information)

INDEX

Motormaster® III Control Sensor Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 17Motormaster III Control Signal Selection Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 18Motormaster III Control Fan Power Wiring — Modules 124A, 124B, 134A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 19Motormaster III Control Fan Power Wiring — Unit Sizes 094 and 104, Module 134B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 20Motormaster III Control 575-V Units, Autotransformer Circuit — Modules 124A, 124B, 134A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 21Motormaster III Control 575-V Units, Autotransformer Circuit — Unit Sizes 094 and 104, Module 134B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 22

LEGEND

*The 38AH124 and 38AH134 units each consist of 2 modules (A and B) that are field assembled.

UNIT OR MODULE*38AH

ELECTRICALCHARACTERISTICS

(V-Ph-Hz)TYPE LABEL DIAGRAM

No. 38AKFIG.NO.

All All Timer Cycle — 1Single-Package Units

094,104

All Component Arrangement 501083 2208/230-3-60

346-3-50 Power Label 501079 3

460-3-60575-3-60380-3-60

380/415-3-50

Power Label 501080 4

All Control Circuit Wiring with 24-V Accessory Relay andOne 2-Stage CCTM — 5

All Control Label 501081 6All VAV Control Label with ModuPanel™ Control 501082 7

All Control Circuit Wiring with Two 24-V Accessory Relays andTwo 2-Stage CCTMs — 8

Modular Units124A, 124B,134A, 134B All Component Arrangement 500876 9

124A, 124B,134A

208/230-3-60346-3-50 Power Label 500868 10

460-3-60575-3-60380-3-60

380/415-3-50

Power Label 500869 11

134B

208/230-3-60346-3-50 Power Label 500870 12

460-3-60575-3-60380-3-60

380/415-3-50

Power Label 500871 13

124A, 124B,134A, 134B

All Control Label 501107 14All VAV Control Label with ModuPanel Control 501108 15

All Control Circuit Wiring with 24-V Accessory Relay andOne 2-Stage CCTM — 16

CCTM — Carrier Communications Temperature MonitorVAV — Variable Air Volume

38AH094-134Air-Cooled Condensing Units

50/60 Hz

2

LEGEND (Fig. 2-6 and 9-15)

NOTES (Fig. 2-6 and 9-15)1. For control voltage connections see chart below.

2. For units with 115-v controls, connect black wire to the whitelead of TRAN2. For units with 230-v controls, connect blackwire to the red lead of TRAN2. For units with 200-v controls,connect black wire to the blue lead of TRAN2.

3. Terminal blocks TB3, TB4, TBX1, and TBX2 are for externalfield control connections. Control connections are to be class 1wiring.

4. Field-supplied components (IFC, LLS-A1 and LLS-A2 musthave a maximum sealed coil rating of 30 va each (0.25 amp at120 vac, 0.13 amp at 230 vac). Thermostats must have a

minimum pilot duty rating of 120 va (1 amp at 120 vac). The fanswitch must have a minimum pilot duty rating of 30 va(0.25 amp at 120 vac, 0.13 amp at 230 vac). On VAV units, theAHMS IFC_AUX and control staging contacts must have a min-imum pilot duty rating of 120 VA (1 amp at 120 vac).

5. Wiring for field power supply must be rated 75 C minimum. Usecopper, copper-clad aluminum, or aluminum conductors. Maxi-mum incoming wire size for each terminal block is 500 kcmil.

6. Replacement of factory wires must be with type 105 C wire orits equivalent.

7. Factory wiring is in accordance with NEC (U.S.A. Standard).Field modifications or additions must be in compliance with allapplicable codes.

8. Compressors and fan motors are thermally protected. The3-phase motors are protected against primary single-phasingconditions.

9. Line numbers on the left side of the label diagrams indicate thecontact number. The numbers on the right side of the label dia-grams match the contacts with their corresponding coils. Aplain number indicates normally open contacts. An underlinednumber indicates normally closed contacts.

10. Control circuit power available for field-installed accessories:

POWERSUPPLY

CONTROLVOLTAGE

TRAN1CONNECTION

TRAN2CONNECTION

60-Hz Units208 115 YEL to H2 BLK wire to WHT lead230 115 YEL to H3 BLK wire to WHT lead460 115 YEL to H4 BLK wire to WHT lead575 115 YEL to H2 BLK wire to WHT lead380 230 N/A BLK wire to RED lead

50-Hz Units230 230 N/A BLK wire to RED lead346 200 N/A BLK wire to BLU lead

380/415 230 N/A BLK wire to RED lead

Standard Unit VAV Unit094 — 165 VA 094 — 75 VA104 — 60 VA 104 — 0 VA124 — 120 VA 124 — 120 VA134 — 120 VA 134 — 120 VA

AHMS — Air Handler ModuPanel™ SwitchATS — Air Temperature SwitchC — Compressor ContactorCB — Compressor Circuit BreakerCCPR — Capacity Control Pressure RelayCCPS — Capacity Control Pressure SwitchCH — Crankcase HeaterCOMP — CompressorCR — Control RelayDU — Dummy TerminalEQUIP — EquipmentFC — Fan ContactorFCB — Fan Circuit BreakerFCPS — Fan Cycling Pressure SwitchFIOP — Factory-Installed OptionFM — Fan MotorFU — FuseGND — GroundHPS — High-Pressure SwitchIFC — Indoor-Fan Contactorkcmil — Thousand circular milsLLS — Liquid Line SolenoidLPR — Low-Pressure RelayLPS — Low-Pressure SwitchMMSN — Motormaster® SensorNEC — National Electrical Code

(U.S.A. Standard, NFPA 70)NFPA — National Fire Protection AssociationOPR — Oil Pressure RelayOPS — Oil Pressure Switch

PL — Plug AssemblyPR — Power RelayPRI — PrimaryPW — Part-Wind StartSDR — Solenoid Drop RelaySEC — SecondaryTB — Terminal BlockTC — Thermostat, CoolingTDR — Time-Delay RelayTM — Timer MotorTR — Timer RelayTRAN — TransformerU — UnloaderVAV — Variable Air VolumeXL — Across-the-Line Start

Terminal Block Connection

Marked Terminal

Unmarked Terminal

Unmarked Splice

Marked Wire

Factory Wiring

Field WiringIndicates Common Potential;Does Not Represent Wiring

3

OPERATING SEQUENCE

Timer Functions — (See Timer Cycle, Fig. 1.) Each re-frigeration circuit is controlled by an independent timer whichallows for the independent operation of each refrigerationcircuit.NOTE: The 124A, 124B, 134A, and 134B modules each haveone timer which controls the lead compressor. Lag compressoris controlled by CCPS (capacity control pressure switch).SWITCH A — The timer is energized through contacts A-A1or A-A2. This establishes the Time Guard® function whichprevents compressor short-cycling. Start of compressor is de-layed approximately 5.5 minutes after shutdown.SWITCH B — The compressor is initially energized throughcontacts B-B1.SWITCH D — Contacts D-D1 provide a 21/2-minute bypassof the low-pressure switch at start-up for winter-start control.On 124A, 124B, 134A, and 134B unit modules, contacts D-D2control start-up of compressor A2.SWITCH E — Contacts E-E1 provide a 120-second bypass ofthe oil pressure switch at start-up. If oil pressure does not buildto the required minimum pressure in 120 seconds, the com-pressor shuts down and the control circuit locks out.

On 38AH094 and 104 units, lag circuit B start-up is delayed60 seconds after a call for cooling is made to the circuit. Thisprevents compressor(s) in both lead and lag circuits from start-ing at the same time.

Control Circuit Reset — The control circuit locks outif the unit shuts down because of low oil pressure or excessivehigh-side pressure. To reset the control circuit, open and closethe fan circuit breaker (FCB). This resets the timer, and the unitrestarts under Time Guard control. At start-up, if the low-pressure switch (LPS) does not close after 21/2 minutes, the unitshuts down. When the pressure builds enough for the LPS tocut in, the control circuit is energized automatically and start-up proceeds under Time Guard control.

Unit Operation — Units are controlled with electrome-chanical components. Each refrigeration circuit is operated byan independent timer which controls the operating sequence ofeach circuit.

On a call for cooling, first stage cooling thermostat TC1closes. Condenser fans and timer (TM) are energized. After ap-proximately 7 seconds, timer contacts E-E1 close. Approxi-mately 12 seconds after TC1 closes, normally open timer con-tacts B-B1 close for 1 second. This energizes compressor A1contacts CA-1 and starts the compressor. At the same time, so-lenoid drop relays (SDRs) and liquid line solenoid valve no. 1(LLS-A1 for all units or modules) open, and timer relay no. 1(TR2) is energized. Normally open TR2 contacts close, com-pleting a circuit around B-B1 and through compressor A1 con-tactors to maintain compressor operation when B-B1 contactsopen. Contacts E-E1 remain closed for approximately 120 sec-onds to bypass the oil pressure switch (OPS). If oil pressure isinsufficient when contacts E-E1 open, the compressor stops,the timer cycles off, and the control circuit locks out. At start-up, timer contacts D-D1 are closed, bypassing low-pressurerelay contacts LPR-A for 21/2 minutes. This provides a winterstart-up feature.

Approximately 21/2 minutes after TC1 closes, timer contactsD-D1 open and D-D2 close. If pressure is insufficient to closethe low-pressure switch, the low-pressure switch relay is open,the compressor shuts down, and the Time Guard control is ini-tiated. (Time Guard control prevents compressor from restart-ing for 5 minutes after the demand for cooling is satisfied.)38AH094,104 UNITS — If circuit A operation is insufficientfor the cooling requirements, the thermostat second stage TC2closes to bring circuit B on-line for cooling. This circuit fol-lows the same sequence of operation as the lead circuit, excepta 60-second time delay relay (TDR) delays compressor start-upfor 60 seconds after the call for cooling.MODULES 124A, 124B, 134A, AND 134BNOTE: This sequence of operation assumes that 2 thermostatscontrol units 38AH124 or 134 with one thermostat controllingeach module.

If compressor A1 is insufficient for the cooling require-ments, the thermostat second stage closes, which opens theliquid line solenoid valve LLS-A2. Compressor A2 starts onlyafter D-D2 contacts in the time close and the suction pressure issufficient to close the capacity control switches.ALL UNITS — When the fan switch is set for automatic(AUTO) operation, the indoor-fan contactor (IFC) is cycledwith the lead compressor. If the fan switch is set for continuous(CONT), the IFC is energized as long as the unit power is on.

Restart After Stoppage by Safety Control —The high-pressure switch, compressor discharge gas thermo-stats, and the oil pressure switch must be reset manually bybreaking the control power supply at any of the followingpoints: control circuit fuse, fan motor circuit breaker, or thethermostat. Restart follows the Time Guard® control delay.

Stoppage by low-pressure switch results in Time Guardcontrol delay, then unit attempts normal restart.

The compressor motor overcurrent protectors are manual-reset circuit breakers. Reset of control circuit may also benecessary.

Independent Refrigerant Circuit Controls —Each refrigeration circuit is controlled by independent circuitry.Therefore, it is possible to maintain partial cooling capabilityeven if one compressor or unit module is inoperable.

NOTE: Black denotes closed contacts.

Fig. 1 — Timer Cycle

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6

Fig. 4 — Unit Power Label Diagram; 38AH094 and 104 Units; 460-3-60, 575-3-60, 380-3-60, 380/415-3-50

7

LEGENDCR — Control RelayHD — Heating DeviceIFC — Indoor-Fan ContactorIFR — Indoor-Fan RelayLLS — Liquid Line SolenoidR — Heating Relay (field-

supplied 24-v sealed coil,10 va maximum rating)

RV — Reversing ValveTB — Terminal Block

Factory WiringField Wiring

*Jumper removed only when separate 24-v transformer powersource is used to power the 33CSUCE-06 relay pack.

†To control heating device and provide automatic indoor-fan opera-tion on heating.

NOTE: Field-supplied liquid line solenoid valves installed at theevaporator are required on all units.

Internal 33CSUCE-06 relay contacts are rated for 1 amp/24 vac.

Fig. 5 — Control Circuit Wiring with Accessory Relay and Thermostat; 38AH094 and 104, All Voltages

8

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Fig. 10 — Unit Power Label Diagram; Modules 38AH124A, 124B, 134A; 208/230-3-60, 346-3-50

15

Fig. 11 — Unit Power Label Diagram; Modules 38AH124A, 124B, 134A;460-3-60, 575-3-60, 380-3-60, 380/415-3-50

16

Fig. 12 — Unit Power Label Diagram; Module 38AH134B; 208/230-3-60, 346-3-50

17

Fig. 13 — Unit Power Label Diagram; Module 38AH134B; 460-3-60, 575-3-60, 380-3-60, 380/415-3-50

18

Fig. 14 — Control Label Diagram; Modules 38AH124A, 124B, 134A, 134B; All Voltages

19

Fig. 15 — Control Label Diagram; 38AH124 and 134 Units with ModuPanel™ Control; All Voltages

20

Fig. 16 — Control Circuit Wiring with Accessory Relay and Thermostat; 38AH124 and 134, All Voltages

LEGENDCR — Control RelayIFC — Indoor-Fan ContactorIFR — Indoor-Fan RelayLLS — Liquid Line SolenoidR — Heating Relay (field-

supplied 24-v sealed coil,10 va maximum rating)

RV — Reversing ValveTB — Terminal Block

Factory WiringField Wiring

*Jumper removed only when separate 24-v transformer powersource is used to power the 33CSUCE-06 relay pack.

NOTES:1. Field-supplied liquid line solenoid valves installed at the evapo-

rator are required on all units.2. Disconnect black wire from CR2 terminal 6; cap loose end and

secure. Connect new field-supplied wire from CR2 terminal 6 toTB3 terminal 1 on module 124B or 134B.

Internal 33CSUCE-06 relay contacts are rated for 1 amp/24 vac.

21

MOTORMASTER® III CONTROLINSTALLATION

Before installing Motormaster III control, refer to generalinformation in Installation Instructions shipped with the con-trol. Comply with the following instructions when applyingMotormaster III control to 38AH094-134 units. Refer toTable 1 for usage and unit modification data.

Required Changes

STEP 1 — WIND BAFFLES AND BRACKETS — Windbaffles and brackets must be field fabricated for 38AH units toensure proper operation at low-ambient temperatures withMotormaster III controls.

STEP 2 — INSTALL MOTORMASTER III CON-TROLS — Two Motormaster III controls must be added foreach unit, one control per refrigerant circuit. SeeMotormaster IIIInstallation Instructions for proper control mounting locations.

Sensors — Install sensor for thermistor input control in properlocation on condenser coil. See Fig. 17 and Motormaster IIIInstallation Instructions. Connect sensor leads to the purpleand gray control signal leads on the Motormaster III controllocated on the same side of the unit.Control Signal Selection Switch — Remove the cover of theMotormaster III controller. Set switch on Motormaster III con-trol board (underneath cover) to accept the thermistor sensorinput signal. Also, set the frequency selection switch to matchunit power supply (50 Hz or 60 Hz). See Fig. 18 for switchlocations and proper position. Replace the cover.

Table 1 — Minimum Outdoor-Air Operating Temperature and Loading Sequences

*Requires VAV (variable air volume) unit or accessory unloader(s)field installed on circuit lead compressor.

†Requires field-installed accessory unloader on circuit leadcompressor.

NOTES:1. Temperatures calculated with the minimum number of fans

operating per circuit.2. For 38AH124 and 134 units, circuit A is Module 38AH124A or

134A. Circuit B is Module 38AH124B or 134B.3. Minimum outdoor-air operating temperature is based on 90 F

saturated condensing temperature and 100% capacity.

To avoid damaging components and wiring, use extremecare when drilling screw holes and screwing in fasteners.

To avoid possibility of electrical shock and personal injury,turn off all power to unit before making electrical connec-tions. Tag all disconnects to alert others not to turn poweron until work is completed.

UNIT 38AHQUANTITY OF LOADED COMPRESSOR

CYLINDERSSYSTEM

CAPACITY(%)

MINIMUM OUTDOOR OPERATING TEMP (F)w/Std Fans w/Motormaster® III

ControlCkt A Ckt B Total Ckt A Ckt B

094

10 6 16 100

7 25 –20

10 4 14 8510 2* 12 70*10 0 10 55

8 0 8 446 0 6 334 0 4 22

104

10 12 22 100

14 5 –20

10 10 20 9110 8† 18 8210 6 16 7410 4 14 6510 2† 12 5610 0 10 47

8 0 8 386 0 6 264 0 4 172† 0 2 9†

124

12 12 24 100

38 38 –20

12 10 22 9112 8† 20 82*12 6 18 7712 4 16 6812 2† 14 5912 0 12 5010 0 10 41

8 0 8 32*6 0 6 274 0 4 182* 0 2 9*

134

12 12 24 100

38 22 –20

12 10 22 9012 8 20 79*12 6 18 7612 4 16 6612 2† 14 5612 0 12 4510 0 10 37

8 0 8 28*6 0 6 254 0 4 162* 0 2 8*

22

38AH094, 104

MODULES 38AH124A, 124B, 134A

MODULE 38AH134B

Fig. 17 — Motormaster® III Sensor Locations

23

STEP 3 — MAKE ELECTRICAL CONNECTIONS

All the necessary wires required for wiring the Motormas-ter® III control into the unit wire in the wire harness for theunit.Modules 38AH124A, 124B, 134A — Connect the powerwires to the control from the appropriate fan contactor, FC-A1or FC-B1. Remove the red, brown, and orange wires from thefan motor contactor. Connect the red fan motor wire to the redwire of the control. Connect the brown fan motor wire to thebrown wire of the control. Connect the orange fan motor wireto the orange wire of the control. See Fig. 19.NOTE: Check to be sure fan motor 1 is wired to MotormasterIII control A, and fan motor 2 is wired to Motormaster IIIcontrol B.

38AH094 and 104, Module 38AH134B — Connect the powerwires to the control from the appropriate fan contactor, FC-A1or FC-B1. Remove the pink, violet, and gray wires from thefan motor contactor. Connect the pink fan motor wire to the redwire of the control. Connect the violet fan motor wire to brownwire of the control. Connect the gray fan motor wire to theorange wire of the control. See Fig. 20.NOTE: Check to be sure fan motor 1 is wired to MotormasterIII control A, and fan motor 2 is wired to Motormaster IIIcontrol B.All 575-v Units — If primary voltage is 575 v, two transform-ers (Carrier part no. HT01AH851) must be used to lower thesupply voltage to the Motormaster III control to 460 v. SeeFig. 21 and 22. The transformers can be mounted anywhereoutside the control box.All Units — When all electrical connections are made, checkthat they are correct and tight. Restore power to unit. Check thephase sequence indicator on the Motormaster III control. Iflighted, turn off power and reverse L1 (black) and L2 (yellow)power leads. Check that fan motors rotate in the proper direc-tion. To change fan rotation, reverse the red and orange outputleads to the motor. Replace and secure the control box innerpanel. Close and secure the control box door.

To avoid possibility of electrical shock and personal injury,turn off all power to unit before making electrical connec-tions. Tag all disconnects to alert others not to turn poweron until work is completed.

LEGEND

*For thermistor (sensor) signal, move switch to the left.NOTE: Thermistor is described in text as “sensor.”

GND — Ground

Fig. 18 — Motormaster® III Control Signal Selection Switch

24

LEGENDFC — Fan ContactorFCB — Fan Circuit BreakerFM — Fan MotorMMSN — Motormaster® Sensor

Fig. 19 — Fan Power Wiring — Modules 38AH124A, 124B, 134A

LEGENDFC — Fan ContactorFCB — Fan Circuit BreakerFM — Fan MotorMMSN — Motormaster® Sensor

Fig. 20 — Fan Power Wiring — 38AH094 and 104, Module 38AH134B

25

LEGEND

FC — Fan ContactorFCB — Fan Circuit BreakerFM — Fan MotorMMSN — Motormaster® SensorTRAN — Transformer

Fig. 21 — 575-v Units, Autotransformer Circuit — Modules 38AH124A, 124B, 134A

LEGEND

FC — Fan ContactorFCB — Fan Circuit BreakerFM — Fan MotorMMSN — Motormaster® SensorTRAN — Transformer

Fig. 22 — 575-v Units, Autotransformer Circuit — 38AH094 and 104, Module 38AH134B

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 563-749 Printed in U.S.A. Form 38AH-3W Pg 28 1-00 Replaces: NewBook 1

Tab 3a

Copyright 2000 Carrier Corporation