37MGHAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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D. WIRING INSTRUCTION
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.
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 2 (L2/N) and 3 (S) between
the outdoor and indoor units - landing the shield onto the ground in the
outdoor unit only.
Table 15 — Wiring Sizes
Electrical and Gas Leaks
ELECTRICAL DATA
Table 16 — Electrical Data
*Permissible limits of the voltage range at which the unit will operate satisfactorily.
LEGEND
FLA - Full Load Amps
MCA - Minimum Circuit Amps
MOP- Maximum Overcurrent Protection
CABLE CABLE SIZE REMARKS
Connection Cable 14AWG
3 wire + Ground 1Φ 208/230 V
(Stranded wire is recommended)
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation. Wires should be sized based on NEDC and
local codes.
WARNING
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation. 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 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 shall be
located within sight and readily accessible from the air conditioner.
Connecting cable with conduit shall be routed through the hole in
the conduit panel.
CAUTION
BEFORE TEST RUN
Only perform test run after you have completed the following
steps:
Electrical Safety Checks – Confirm that the unit’s electrical
system is safe and operating properly
Gas Leak Checks – Check all flare nut connections and confirm
that the system is not leaking
Confirm that gas and liquid (high and low pressure) valves are
fully open.
WARNING
OUTDOOR UNIT
18K 24K 30K 36K 48K 55K
(208/230V) (208/230V) (208/230V) (208/230V) (208/230V) (208/230V)
Minimum Circuit Ampacity (MCA) A 17.5 30 37 37 43.0 43.0
Maximum Overcurrent Protection Ampacity (MOPA) A 20 35 40 40 45.0 45.0
Voltage-Phase-Frequency 208/230-1-60
Max – Min Voltage Range * 253-187
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