Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 533-80086 Printed in U.S.A. Form 38A-5W Pg 1 3-03 Replaces: 38-4WBook 1 4

Tab 5a 5a

Wiring DiagramsINDEX

*Units produced after 03/31/03.

LEGEND (Fig. 1-11)

NOTES (Fig. 1 and 2)

1. Factory wiring is in accordance with National ElectricalCode (NEC). Field modifications or additions must be incompliance with all applicable codes.

2. Use copper conductors only.3. CAUTION: Not suitable for use on systems exceeding

150 volts to ground.4. Manual reset circuit breaker is integral to the transformer.

NOTES (Fig. 3-10)

1. If any of the original wire furnished must be replaced, itmust be replaced with type 90° C wire or its equivalent.

2. For thermostat and subbase part no. see price pages.

3. Set heat anticipator at .6.4. Use copper conductors only.5. Three-phase motors are protected under primary single

phasing conditions.6. 39 va available for field-installed accessories. Control

power requirement for heat pump condensing unit is36 va (sealed). Supplied control transformer is 75 va.

NOTES (Fig. 11)

1. Factory wiring is in accordance with National ElectricalCode (NEC). Field modifications or additions must be incompliance with all applicable codes.

2. Use copper conductors only.

UNITELECTRICAL

CHARACTERISTICS(V-Ph-Hz)

LABEL DIAGRAMNUMBER

FIGURE NO. TYPE

38AQ007208/230-3-60

Not available1

Control Schematic and Component Arrangement460-3-60 2575-3-60 2

38ARQ008,012

230-3-60 38AK5401793

Control Schematic and Component Arrangement

4*

400-3-50 38AK54029656*

460-3-60 38AK54018078*

575-3-60 38AK5402119

10*40RMQ008-012 Applies to all 40RM500859 11 Unit Wiring Diagram

C — Contactor, CompressorCAP — CapacitorCB — Circuit BreakerCCH — Crankcase HeaterCLO — Compressor LockoutCOMP — CompressorDFC — Defrost ControlDFT — Defrost ThermostatDGT — Discharge Gas ThermostatEQUIP — EquipmentFM — Fan MotorGND — GroundHP,HPS — High-Pressure SwitchIFC — Indoor-Fan ContactorIFM — Indoor-Fan Motor

LAR — Low Ambient RelayLAS — Low Ambient SwitchLCS — Loss-of-Charge SwitchLLSV — Liquid Line Solenoid ValveLP, LPS — Low-Pressure SwitchMMR — Motormaster® RelayNEC — National Electrical CodeOFM — Outdoor-Fan MotorOFR — Outdoor-Fan RelayPS — Pressure SwitchRV — Reversing ValveRVS — Reversing Valve SolenoidTB — Terminal BlockTRAN(S) — TransformerTSTAT — Thermostat

Field Splice

Marked Wire

Terminal (Marked)

Terminal (Unmarked)Terminal Block

SpliceFactory Power WiringFactory Control WiringField Control WiringField Power WiringAccessory or Optional WiringTo indicate common potential only,not to represent wiring.

38AQ007, 38ARQ008,012/40RMQSplit System

Heat Pump50/60 Hz

2

SEQUENCE OF OPERATION —38AQ007 OUTDOOR UNIT WITH

40RM008 INDOOR UNIT

When power is supplied to unit, the transformer (TRAN)and crankcase heater (CCH) are energized.

Cooling — On a call for cooling, the thermostat completesthe following circuits: R-G, R-Y, and R-O. If the compressorrecycle delay of 3 minutes is complete, the compressor andoutdoor fan start. The reversing valve is energized for coolingand the indoor-fan motor starts.

When the thermostat is satisfied, the circuits are opened,and the compressor, outdoor-fan motor, and indoor-fan motorstop. The reversing valve is deenergized.

Heating — On a call for heating, the thermostat completesthe following circuits: R-G and R-Y. If the compressor recycledelay of 3 minutes is complete, the compressor and outdoor fanstart. The indoor-fan motor will also start.

If room temperature continues to fall, the thermostat com-pletes circuit R-W. If the optional electric heat package isused, the heat relay is energized, and the electric heaters areenergized.

When the thermostat is satisfied, the circuits are opened,and the compressor, outdoor-fan motor, heaters, and indoor-fanmotor stop.

Defrost — The Defrost board (DB) is a time and tempera-ture control, which includes a field-selectable time periodbetween checks for frost (30, 50, and 90 minutes). Electronictimer and defrost cycle start only when contactor is energizedand defrost thermostat (DFT) is closed (below 36 F [2.2 C]).

Defrost mode is identical to Cooling mode, except outdoor-fan motor (OFM) stops and a bank of supplemental electricheat (if equipped) turns on to warm air supplying the condi-tioned space. Defrost mode is terminated when the DFTreaches 51 F (10.6 C).

Low Ambient — Cooling head pressure control at lowambient conditions is accomplished through a low ambientrelay and switch. The switch is factory set to close at 250 psigand open at 100 psig. In Heating mode, the low ambient switchis bypassed by normally closed contacts on the low ambientrelay.

Air Circulation — When the fan switch is at FAN ON,the indoor-air fans operate continuously to provide ventilation.The thermostat operates the other components as describedabove.

Emergency Heat Cycle — If the compressor is inoper-ative due to a tripped safety device, the second stage of thethermostat automatically energizes the indoor-air fan and theelectric resistance heaters (if equipped).

SEQUENCE OF OPERATION — 38ARQ008,012 OUTDOOR UNIT WITH

40RMQ008,012 INDOOR UNIT

When power is supplied to unit, the transformer (TRAN) isenergized. The crankcase heater is also energized.

Cooling — With the thermostat in the cooling position, andwhen the space temperature comes within 2° F of the coolingset point, the thermostat makes circuit R-O. This energizes thereversing valve solenoid (RVS) and places the unit in standbycondition for cooling.

As the space temperature continues to rise, the second stageof the thermostat makes, closing circuit R-Y. When compressortime delay (5 ± 2 minutes) is completed, a circuit is made tocontactor (C), starting the compressor (COMP) and outdoor-fan motor (OFM). Circuit R-G is made at the same time,energizing the indoor-fan contactor (IFC) and starting theindoor-fan motor (IFM) after one-second delay.

When the thermostat is satisfied, contacts open, deenergiz-ing C. The COMP, IFM, and OFM stop.

Heating — On a call for heat, thermostat makes circuitsR-Y and R-G. When compressor time delay (5 ± 2 minutes) iscompleted, a circuit is made to C, starting COMP and OFM.Circuit R-G also energizes IFC and starts IFM after a 1-seconddelay.

Should room temperature continue to fall, circuit R-W ismade through second-stage thermostat bulb. If optional electricheat package is used, a relay is energized, bringing on supple-mental electric heat. When thermostat is satisfied, contactsopen, deenergizing contactor and relay; motors and heatersdeenergize.

Defrost — Defrost board (DB) is a time and temperaturecontrol, which includes a field-selectable time period betweenchecks for frost (30, 50, and 90 minutes). Electronic timer anddefrost cycle start only when contactor is energized and defrostthermostat (DFT) is closed (below 28 F [–2.2 C]).

Defrost mode is identical to Cooling mode, except outdoor-fan motor (OFM) stops and a bank of supplemental electricheat turns on to warm air supplying the conditioned space. De-frost mode is terminated when the DFT reaches 65 F (18.3 C).

3

RV

Y

R

BK

PL

Y

CCBL

BK

BL BR

CCH

PS2

Y

DF

C

PS1

O WR

BK

BK

FM

Y-RVDEFROSTCONTROL

BKR

BL

R-RV

R

BR

CAPFAN

L2T2

L1

L3

T1

T3

T2

COIL

BK

SWITCHLOW AMBIENT

3

1LOWAMBIENT

2

COIL

RELAY

R

RVCOIL

SEN

DEFROST HEAT

COMPRESSOR

HEAT/COOL

COMMON

24 VAC

WY

L1BKBK

L2

L3

BLT1

COMPT3

DANGER: ELECTRICAL SHOCK HAZARDDISCONNECT POWER BEFORE SERVICING

R

CONNECTION DIAGRAM

O

BL

OBL

ATTACH GROUND

PS2

PS1

LP/HP

LP/HP

TWO SWITCH WIRING

R

POWER SUPPLY PERN.E.C. AND LOCALCODES 208/230 VAC,60 HZ, 3 PH.

GROUND EQUIPMENTPER N.E.C. ANDLOCAL CODES.

BK

BL

BL

BL (WHENUSED)

PRI

TRANS

SEC

RBL

G

R

BL

L1T1CONT.

+t°

T3

COMPRESSOR

CONTACTOR

L3

LADDER DIAGRAM

FAN Y-RV RV

RVCOIL

CCC

DEFROSTCONTROL PS2

COIL

PS1

DF

CR Y WOR-RV

LP/HP

SEN

FM

CAP

DEFROST HEATCOMPRESSORHEAT/COOLCOMMON24 VAC

LAR

21

LAS

LOW AMBIENTRELAY

208/230 VAC, 60 HZ, 3 PH POWER SUPPLY

DFC

FAN

(WHENUSED)

RE

SE

T

24VTRANSFORMER NOTE 4

208/230V

L2

T2

CONTACTOR

T2

T1

T3BK

CCH

Fig. 1 — Control Schematic and Component Arrangement — 38AQ007 (208/230 V)

RV

Y

R

BK

PL

Y

CCBL

BK

BL BR

CCH

PS2

Y

DF

C

Y

PS1

O WR

BK

BK

FM

Y-RVDEFROSTCONTROL

BKR

BL

R-RV

R

BR

CAPFAN

COIL

2

L2T2

L1

L3

T13

T3

T2

COIL

BK

1DEFROST

SWITCH

RELAY

LOW AMBIENT

3

1LOWAMBIENT

2

COIL

RELAY

BK

R

DFR

RVCOIL

SEN

DEFROST HEAT

COMPRESSORHEAT/COOLCOMMON24 VAC

WY

T2

COMPRESSOR

L1BKBK

L2

L3T1

575/460 VAC 60 HZ 3PH

COMPT3

DANGER: ELECTRICAL SHOCK HAZARDDISCONNECT POWER BEFORE SERVICING

R

CONNECTION DIAGRAM

OBL

OBL

LADDER DIAGRAM

PS2

PS1

T1

T3

LP/HP

FAN Y-RVRV

RV

COIL

CCC

DEFROSTCONTROL PS2

COIL

PS1

DF

CR Y WOR-RV

LP/HP

SENLP/HP

TWO SWITCH WIRING

FM

CAP

DEFROST HEATCOMPRESSORHEAT/COOLCOMMON24 VAC

LAR

121 3

LAS

LOW AMBIENTRELAY RELAY

DEFROST

R

Y

BL

BL

BLG

SEC

TRANS

PRI

RBL

BL R

RE

SE

T

24VTRANSFORMER NOTE 4

575/460V

BK

L1T1CONT.

+t°

T3

CONTACTOR

L3

L2

T2

CONTACTOR

CCH

BL

ATTACHGROUND

575/460 VAC60 HZ 3PH

Fig. 2 — Control Schematic and Component Arrangement — 38AQ007 (460 and 575 V)

4

Fig. 3 — Control Schematic and Component Arrangement — 38ARQ008 and 012 (208/230-3-60) Units Produced Before 03/31/03

5

Fig. 4 — Control Schematic and Component Arrangement — 38ARQ008 and 012 (208/230-3-60) Units Produced After 03/31/03

6

Fig. 5 — Control Schematic and Component Arrangement — 38ARQ008 and 012 (400-3-50) Units Produced Before 03/31/03

7

Fig. 6 — Control Schematic and Component Arrangement — 38ARQ008 and 012 (400-3-50) Units Produced After 03/31/03

8

Fig. 7 — Control Schematic and Component Arrangement — 38ARQ008 and 012 (460-3-60) Units Produced Before 03/31/03

9

Fig. 8 — Control Schematic and Component Arrangement — 38ARQ008 and 012 (460-3-60) Units Produced After 03/31/03

10

Fig. 9 — Control Schematic and Component Arrangement — 38ARQ008 and 012 (575-3-60) Units Produced Before 03/31/03

11

Fig. 10 — Control Schematic and Component Arrangement — 38ARQ008 and 012 (575-3-60) Units Produced After 03/31/03

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 533-80086 Printed in U.S.A. Form 38A-5W Pg 12 3-03 Replaces: 38-4WBook 1 4

Tab 5a 5a

Copyright 2003 Carrier Corporation

Fig. 11 — 48RMQ008-012 (208/230-3-60, 460-3-60, 575-3-60, 400-3-50) Wiring Detail