38AQ007, 38ARQ008,012/40RMQ
Split System
Heat Pump
50/60 Hz
Wiring Diagrams
INDEX
UNIT
38AQ007
ELECTRICAL
CHARACTERISTICS
(V-Ph-Hz)
208/230-3-60
460-3-60
575-3-60
LABEL DIAGRAM
NUMBER
1
2
2
3
4*
5
6*
7
8*
9
10*
11
Not available
230-3-60
38AK540179
400-3-50
38AK540296
460-3-60
38AK540180
575-3-60
38AK540211
Applies to all
40RM500859
38ARQ008,012
40RMQ008-012
FIGURE
NO.
TYPE
Control Schematic and Component Arrangement
Control Schematic and Component Arrangement
Unit Wiring Diagram
*Units produced after 03/31/03.
LEGEND (Fig. 1-11)
C
CAP
CB
CCH
CLO
COMP
DFC
DFT
DGT
EQUIP
FM
GND
HP,HPS
IFC
IFM
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Contactor, Compressor
Capacitor
Circuit Breaker
Crankcase Heater
Compressor Lockout
Compressor
Defrost Control
Defrost Thermostat
Discharge Gas Thermostat
Equipment
Fan Motor
Ground
High-Pressure Switch
Indoor-Fan Contactor
Indoor-Fan Motor
LAR
LAS
LCS
LLSV
LP, LPS
MMR
NEC
OFM
OFR
PS
RV
RVS
TB
TRAN(S)
TSTAT
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Low Ambient Relay
Low Ambient Switch
Loss-of-Charge Switch
Liquid Line Solenoid Valve
Low-Pressure Switch
Motormaster® Relay
National Electrical Code
Outdoor-Fan Motor
Outdoor-Fan Relay
Pressure Switch
Reversing Valve
Reversing Valve Solenoid
Terminal Block
Transformer
Thermostat
NOTES (Fig. 1 and 2)
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 integral to the transformer.
Field Splice
Marked Wire
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Factory Power Wiring
Factory Control Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate common potential only,
not to represent wiring.
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 is
36 va (sealed). Supplied control transformer is 75 va.
NOTES (Fig. 11)
NOTES (Fig. 3-10)
1. If any of the original wire furnished must be replaced, it
must be replaced with type 90° C wire or its equivalent.
2. For thermostat and subbase part no. see price pages.
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.
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: 38-4W
Book 1 4
Tab 5a 5a
SEQUENCE OF OPERATION —
38AQ007 OUTDOOR UNIT WITH
40RM008 INDOOR UNIT
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).
When power is supplied to unit, the transformer (TRAN)
and crankcase heater (CCH) are energized.
SEQUENCE OF OPERATION —
38ARQ008,012 OUTDOOR UNIT WITH
40RMQ008,012 INDOOR UNIT
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.
When power is supplied to unit, the transformer (TRAN) is
energized. The crankcase heater is also energized.
Cooling — With the thermostat in the cooling position, and
when the space temperature comes within 2° F of the cooling
set point, the thermostat makes circuit R-O. This energizes the
reversing valve solenoid (RVS) and places the unit in standby
condition for cooling.
As the space temperature continues to rise, the second stage
of the thermostat makes, closing circuit R-Y. When compressor
time delay (5 ± 2 minutes) is completed, a circuit is made to
contactor (C), starting the compressor (COMP) and outdoorfan motor (OFM). Circuit R-G is made at the same time,
energizing the indoor-fan contactor (IFC) and starting the
indoor-fan motor (IFM) after one-second delay.
When the thermostat is satisfied, contacts open, deenergizing C. The COMP, IFM, and OFM stop.
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.
Heating — On a call for heat, thermostat makes circuits
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).
R-Y and R-G. When compressor time delay (5 ± 2 minutes) is
completed, a circuit is made to C, starting COMP and OFM.
Circuit R-G also energizes IFC and starts IFM after a 1-second
delay.
Should room temperature continue to fall, circuit R-W is
made through second-stage thermostat bulb. If optional electric
heat package is used, a relay is energized, bringing on supplemental electric heat. When thermostat is satisfied, contacts
open, deenergizing contactor and relay; motors and heaters
deenergize.
Low Ambient — Cooling head pressure control at low
Defrost — Defrost board (DB) is a time and temperature
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.
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 28 F [–2.2 C]).
Defrost mode is identical to Cooling mode, except outdoorfan motor (OFM) stops and a bank of supplemental electric
heat turns on to warm air supplying the conditioned space. Defrost mode is terminated when the DFT reaches 65 F (18.3 C).
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.
2
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
2
T2
T2
T3
CCH
BK
G
COIL
COMPRESSOR
ATTACH GROUND
T1
SEC
CAP
LAS
R
BK
DEFROST Y-RV
CONTROL
FM
RV
PL
R
PS1
BL
BK
BK
SEN
PS1
R-RV
COIL
LP/HP
LP/HP
RRV
DEFROST HEAT
W
R C
COMPRESSOR
HEAT/COOL
Y
O
BL
SEN
DF
TWO SWITCH WIRING
O
C
CC
DEFROST
CONTROL PS2
PS1
FM
BL
RV
COIL
RV
LP/HP
PS2
O Y W
R C
(WHEN
USED)
Y-RV
FAN
Y
DF
BK BR R
USED)
TRANSFORMER NOTE 4
24V
Y
PS2
DFC
2
208/230V
BL
BL
CC
BL BR R
1
FAN
LOW AMBIENT
RELAY
(WHEN
BK RV
BK COIL
RESET
FAN
CAP
BL
CONT.
CONTACTOR
COIL
TRANS
L1
T1
L2
CONTACTOR
T3
BK
PRI
BL
CCH
+t°
L1
L1
DIAGRAM
L3
GROUND EQUIPMENT
PER N.E.C. AND
LOCAL CODES.
T2
T3
BL
T3
LADDER
208/230 VAC, 60 HZ, 3 PH POWER SUPPLY
O Y W
DEFROST HEAT
COMPRESSOR
HEAT/COOL
COMMON
24 VAC
LAR
COMMON
R
24 VAC
Fig. 1 — Control Schematic and Component Arrangement — 38AQ007 (208/230 V)
DANGER: ELECTRICAL SHOCK HAZARD
DISCONNECT POWER BEFORE SERVICING
CONNECTION DIAGRAM
LADDER
BL
R
LOW AMBIENT
SWITCH
T3
T3
L3
L3
T2
L2
L2
BL
T1
L1
BK
TRANS
1
BL
G
1
DEFROST
RELAY
SEC
2
L1
BK
BL
COIL
COMPRESSOR
Y
COIL
T2
T3
CCH
2
L2
T2
ATTACH
GROUND
BK
COIL
CONT.
CONTACTOR
T3
BK
3
3
L1
T1
CONTACTOR
T1
BK
PRI
CCH
+t°
L3
T2
COMP
BL
LOW
AMBIENT
RELAY
575/460 VAC
60 HZ 3PH
R
R
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
BK
BK
DF
R C
FM
PS2
LP/HP
PS1
LP/HP
O Y W
DEFROST HEAT
COMPRESSOR
HEAT/COOL
COMMON
24 VAC
W
Y
O
BL
R
Y-RV
RV
DEFROST CC
CONTROL PS2
PS1
TWO SWITCH WIRING
O
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
DF
RRV
R C
COIL
C
COIL
LP/HP
SEN
O Y W
LAR
DEFROST HEAT
COMPRESSOR
HEAT/COOL
COMMON
24 VAC
Fig. 2 — Control Schematic and Component Arrangement — 38AQ007 (460 and 575 V)
3
Fig. 3 — Control Schematic and Component Arrangement —
38ARQ008 and 012 (208/230-3-60) Units Produced Before 03/31/03
4
Fig. 4 — Control Schematic and Component Arrangement —
38ARQ008 and 012 (208/230-3-60) Units Produced After 03/31/03
5
Fig. 5 — Control Schematic and Component Arrangement —
38ARQ008 and 012 (400-3-50) Units Produced Before 03/31/03
6
Fig. 6 — Control Schematic and Component Arrangement —
38ARQ008 and 012 (400-3-50) Units Produced After 03/31/03
7
Fig. 7 — Control Schematic and Component Arrangement —
38ARQ008 and 012 (460-3-60) Units Produced Before 03/31/03
8
Fig. 8 — Control Schematic and Component Arrangement —
38ARQ008 and 012 (460-3-60) Units Produced After 03/31/03
9
Fig. 9 — Control Schematic and Component Arrangement —
38ARQ008 and 012 (575-3-60) Units Produced Before 03/31/03
10
Fig. 10 — Control Schematic and Component Arrangement —
38ARQ008 and 012 (575-3-60) Units Produced After 03/31/03
11
Fig. 11 — 48RMQ008-012 (208/230-3-60, 460-3-60, 575-3-60, 400-3-50) Wiring Detail
Copyright 2003 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. 533-80086
Printed in U.S.A.
Form 38A-5W
Pg 12
3-03
Replaces: 38-4W
Book 1 4
Tab 5a 5a