Electrical Data; Wiring - Carrier 38MHRB series Service Manual

ELECTRICAL DATA

Cooling Only
Power Supply
Compressor
Outdoor Fan Motor
Heat Pump
Power Supply
Compressor
Outdoor Fan Motor
*Permissible limits of the voltage range at which the unit will operate satisfactorily.
LEGEND
FLA - Full Load Amps
MCA - Minimum Circuit Amps
MOCP - Maximum Over-Current Protection
RLA - Rated Load Amps

WIRING

All wires must be sized per NEC (National Electrical Code) or
CEC (Canadian Electrical Code) and local codes. Use Electrical
Data table MCA (minimum circuit amps) and MOCP (maximum
over current protection) to correctly size the wires and the
disconnect fuse or breakers respectively.
Recommended Connection Method for Power and
Communication Wiring:
The main power is supplied to the outdoor unit. The field supplied
14/3 stranded wire with ground with a 600 volt insulation rating,
power/communication wiring from the outdoor unit to indoor unit
consists of four (4) wires and provides the power for the indoor
unit. Two wires are line voltage AC power, one is communication
wiring (S) and the other is a ground wire. Wiring between indoor
and outdoor unit is polarity sensitive. The use of BX wire is NOT
recommended.
If installed in a high Electromagnetic field (EMF) area and
communication issues exists, a 14/2 stranded shielded wire can be
used to replace L2/N and (S) between outdoor unit and indoor unit
landing the shield onto ground in the outdoor unit only.
Table 10—Electrical Data (Cooling Only)
Outdoor Unit Size
Volts-PH-Hz (115V)
Max – Min*
127-104
Oper. Voltage
MCA
MOCP
RLA
FLA
Rated HP
Output
Table 11—Electrical Data (Heat Pump)
Outdoor Unit Size 12K
Volts-PH-Hz (115V)
Max – Min*
127-104
Oper. Voltage
MCA 13
MOCP 20
RLA 10.5
FLA 0.6
Rated HP 0.054
Output 40
12K 12K
(208/230V)
253-187
13 11
20 15
9.5 6.8
0.6 0.5
0.054 0.054
40 40
9K
(208/230V) (208/230V)
253-187 253-187
8
15
5.5
0.4
0.054 0.054
40
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Wires should be sized based on NEC and local codes.
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
SBe sure to comply with local codes while running wire from
the indoor unit to the outdoor unit.
SEvery wire must be connected firmly. Loose wiring may
cause the terminal to overheat or result in unit malfunction.
A fire hazard may also exist. Ensure all wiring is tightly
connected.
SNo wire should touch the refrigerant tubing, compressor or
any moving parts.
SDisconnecting means must be provided and shall be located
within sight and readily accessible from the air conditioner.
SConnecting cable with conduit shall be routed through the
hole in the conduit panel.
9
18K 24K
(208/230V) (208/230V)
253-187 253-187
15
20
9
0.6 0.6
0.054 0.068
40
12K 18K
(208/230V) (208/230V)
253-187 253-187
10 15
15 20
6.8 10.5
0.4 0.5
0.054
40 40
CAUTION
CAUTION
18
25
12
50
24K
18
25
12
0.6
0.068
50