38AQ007/40RMQ008
Split System
Heat Pump
Wiring Diagrams
60 Hz
WIRING DIAGRAM INDEX
Fig. No.
Control Schematic and Component Arrangement (208/230 V) 38AQ007. . . . . . . . . . . . . 1
Control Schematic and Component Arrangement (460 and 575 V) 38AQ007 . . . . . . . . . 2
40RMQ008 Unit Wiring Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
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 completes
the following circuits: R-G, R-Y, and R-O. If the compressor
recycle delay of 3 minutes is complete, the compressor and
outdoor fan start. The reversing valve is energized for cooling
and the indoor-fan motor starts.
When the thermostat is satisfied, the circuits are opened,
and the compressor, outdoor-fan motor, and indoor fan motor
stop. The reversing valve is deenergized.
Heating — On a call for heating, the thermostat completes
the following circuits: R-G and R-Y. If the compressor recycle
delay of 3 minutes is complete, the compressor and outdoor fan
start. The indoor-fan motor will also start.
If room temperature continues to fall, the thermostat completes circuit R-W. If the optional electric heat package is
used, the heat relay is energized, and the electric heaters are
energized.
When the thermostat is satisfied, the circuits are opened,
and the compressor, outdoor-fan motor, heaters, and indoor-fan
motor stop.
Defrost — The Defrost board (DB) is a time and temperature control, which includes a field-selectable time period
between checks for frost (30, 50, and 90 minutes). Electronic
timer and defrost cycle start only when contactor is energized
and defrost thermostat (DFT) is closed (below 36 F [2.2 C]).
Defrost mode is identical to Cooling mode, except outdoorfan motor (OFM) stops and a bank of supplemental electric
heat (if equipped) turns on to warm air supplying the conditioned space. Defrost mode is terminated when the DFT
reaches 51 F (10.6 C).
Low Ambient — Cooling head pressure control at low
ambient conditions is accomplished through a low ambient
relay and switch. The switch is factory set to close at 250 psig
and open at 100 psig. In Heating mode, the low ambient switch
is bypassed by normally closed contacts on the low ambient
relay.
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 described
above.
Emergency Heat Cycle — If the compressor is inoperative due to a tripped safety device, the second stage of the
thermostat automatically energizes the indoor-air fan and the
electric resistance heaters (if equipped).
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 533-80005
Printed in U.S.A.
Form 38AQ-8W
Pg 1
4-01
Replaces: New
Book 1 4
Tab 5a 5a
DANGER: ELECTRICAL SHOCK HAZARD
DISCONNECT POWER BEFORE SERVICING
CONNECTION DIAGRAM
POWER SUPPLY PER
N.E.C. AND LOCAL
CODES 208/230 VAC,
60 HZ, 3 PH.
BL
R
LOW AMBIENT
SWITCH
R
R
L3
L3
T2
L2
L2
COMP
BL
T1
BK
3
BK
LOW
AMBIENT
RELAY
1
T1
CONTACTOR
T2
T2
COMPRESSOR
ATTACH GROUND
T1
SEC
CAP
LAS
R
FAN
CAP
DEFROST Y-RV
CONTROL
FM
RV
BL BR R
R
PS1
BL
BK
BK
R C
BL (WHEN
USED)
SEN
PS2
PS1
R-RV
FM
DEFROST HEAT
W
COMPRESSOR
HEAT/COOL
Y
O
BL
Contactor
Capacitor
Crankcase Heater
Compressor
Defrost Control
Defrost Relay
Fan Motor
High-Pressure Switch
Low Ambient Switch
Low Ambient Relay
LEGEND
LP
PL
PS
RV
TRANS
—
—
—
—
—
RV
COIL
C
COIL
LP/HP
DF
RRV
R C
LAR
24 VAC
Low-Pressure Switch
Plug
Pressure Switch
Reversing Valve
Transformer
Factory Power Wiring
Factory Control Wiring
Field Control Wiring
Field Power Wiring
NOTES:
1. Factory wiring is in accordance with National Electrical Code (NEC). Field
modifications or additions must be in compliance 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 integeral to the transformer.
Fig. 1 — Control Schematic and Component Arrangement — 38AQ007 (208/230 V)
2
SEN
O Y W
COMMON
R
—
—
—
—
—
—
—
—
—
—
CC
DEFROST
CONTROL PS2
LP/HP
TWO SWITCH WIRING
O
C
CAP
CCH
COMP
DFC
DFR
FM
HP
LAS
LAR
LP/HP
RV
PS1
O Y W
BL
Y-RV
FAN
Y
DF
BK BR R
TRANSFORMER NOTE 4
24V
Y
PS2
DFC
2
USED)
208/230V
BL
BL
CC
1
FAN
LOW AMBIENT
RELAY
(WHEN
BK RV
BK COIL
RESET
BK
PL
CONT.
T3
CCH
BK
G
COIL
L1
T1
L2
CONTACTOR
T3
COIL
TRANS
2
CCH
+t°
L1
L1
DIAGRAM
L3
BK
PRI
BL
GROUND EQUIPMENT
PER N.E.C. AND
LOCAL CODES.
T2
T3
BL
T3
LADDER
208/230 VAC, 60 HZ, 3 PH POWER SUPPLY
DEFROST HEAT
COMPRESSOR
HEAT/COOL
COMMON
24 VAC
DANGER: ELECTRICAL SHOCK HAZARD
DISCONNECT POWER BEFORE SERVICING
CONNECTION DIAGRAM
LADDER
BL
575/460 VAC
60 HZ 3PH
R
R
R
LOW AMBIENT
SWITCH
T3
T3
L3
L3
T2
L2
L2
BL
PRI
T1
L1
BK
TRANS
LOW
AMBIENT
RELAY
1
BL
G
1
DEFROST
RELAY
SEC
2
L1
BK
BL
COIL
COMPRESSOR
T3
CCH
2
Y
COIL
T2
T2
ATTACH
GROUND
BK
COIL
CONT.
CONTACTOR
T3
BK
3
L1
T1
L2
CONTACTOR
T1
BK
3
CCH
+t°
L3
T2
COMP
BL
DIAGRAM
575/460 VAC 60 HZ 3PH
T1
CAP
R
FAN
FM
DEFROST Y-RV
CONTROL
BK
BK
RV
R
RV
COIL
24V
DFR
RV
PL
PS1
Y
R C
PS2
BK
BK
DF
FM
DEFROST HEAT
COMPRESSOR
HEAT/COOL
COMMON
24 VAC
W
O
BL
R
—
—
—
—
—
—
—
—
—
—
Contactor
Capacitor
Crankcase Heater
Compressor
Defrost Control
Defrost Relay
Fan Motor
High-Pressure Switch
Low Ambient Switch
Low Ambient Relay
LEGEND
LP
PL
PS
RV
TRANS
—
—
—
—
—
C
DEFROST CC
CONTROL PS2
LP/HP
TWO SWITCH WIRING
Y
COIL
Y-RV
RV
COIL
LP/HP
PS1
PS1
O Y W
O
C
CAP
CCH
COMP
DFC
DFR
FM
HP
LAS
LAR
LP/HP
FAN
SEN
R-RV
BL
1
3
TRANSFORMER NOTE 4
Y
PS2
BK BR R
2
575/460V
BL
BL
CC
BL BR R
1
LOW AMBIENT DEFROST
RELAY
RELAY
RESET
CAP
BL
LAS
Y
SEN
DF
RRV
R C
O Y W
LAR
DEFROST HEAT
COMPRESSOR
HEAT/COOL
COMMON
24 VAC
Low-Pressure Switch
Plug
Pressure Switch
Reversing Valve
Transformer
Factory Power Wiring
Factory Control Wiring
Field Control Wiring
Field Power Wiring
NOTES:
1. Factory wiring is in accordance with National Electrical Code (NEC). Field
modifications or additions must be in compliance 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 integeral to the transformer.
Fig. 2 — Control Schematic and Component Arrangement — 38AQ007 (460 and 575 V)
3
LEGEND
IFC
IFM
TB
TSTAT
—
—
—
—
Indoor-Fan Contactor
Indoor-Fan Motor
Terminal Block
Thermostat
Factory Wiring
Field Control Wiring
NOTES:
1. Factory wiring is in accordance with National Electrical Code (NEC). Field
modifications or additions must be in compliance with all applicable codes.
2. Use copper conductors only.
Fig. 3 — 40RMQ008 Wiring Detail
Copyright 2001 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 533-80005
Printed in U.S.A.
Form 38AQ-8W
Pg 4
4-01
Replaces: New
Book 1 4
Tab 5a 5a