IM-40MBDQ-05 Specifications subject to change without notice. 15
WIRING
Size all wires per the NEC (National Electrical Code) or CEC
(Canadian Electrical Code) and local codes. Use the electrical
data from the outdoor unit (MCA - minimum circuit amps and
MOCP - maximum over current protection), to correctly size
the wires and the disconnect fuse or breakers respectively.
SIZES 09-24 RECOMMENDED CONNECTION METHOD
FOR POWER AND COMMUNICATION WIRING
Power and Communication Wiring: The main power is
supplied to the outdoor unit. The field supplied 14/3 power/
communication wiring, from the outdoor unit to the indoor
unit, consists of four (4) wires and provides the power for the
indoor unit. Two wires are high voltage AC power, one is
communication wiring and the other is a ground wire.
To minimize communication interference: If installed in a
high Electromagnetic field (EMF) area and communication
issues arise, a 14/2 stranded shielded wire can be used to
replace L2 and (S) between the outdoor and indoor units -
landing the shield onto the ground in the outdoor unit only.
Table 7 — Wiring Sizes 09-24
SIZES 36-58 RECOMMENDED CONNECTION METHOD
FOR POWER AND COMMUNICATION WIRING
Power and Communication Wiring: The main power is
supplied to the outdoor unit. The field supplied power wiring
from the outdoor unit to the indoor unit consists of three (3)
wires and provides the power for the indoor unit. Two wires
are high voltage AC power and one is a ground wire. To
minimize voltage drop, the factory recommended wire size is
14/2 stranded with a ground.
Communication Wiring: A separate shielded stranded copper
conductor only, with a 600 volt rating and double insulated
copper wire, must be used as the communication wire from the
outdoor unit to the indoor unit.
Please use a separate shielded 16GA stranded control wire.
Table 8 — Wiring Sizes 36-58
CABLE CABLE SIZE REMARKS
Connection
Cable
14AWG
3 wire + Ground 1
Φ 208/230 V
(Stranded wire is
recommended)
CABLE CABLE SIZE REMARKS
Power
Connection
Cable
14AWG 2 wire + Ground 1Φ 208/230 V
Communication
Cable
16AWG
2 wire stranded shielded control
wire
EQUIPMENT DAMAGE HAZARD
Be sure to comply with local codes while running wire from the
indoor unit to the outdoor unit.
Every wire must be connected firmly. Loose wiring may cause the
terminal to overheat or result in a unit malfunction. A fire hazard
may also exist. Ensure all wiring is tightly connected.
No wire should touch the refrigerant tubing, compressor or any
moving parts.
Disconnecting means must be provided and located within sight
and readily accessible from the system.
Route the connecting cable with conduit through the hole in the
conduit panel.
CAUTION
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