Installation Instructions

4 Specifications subject to change without notice. IM-40MHH-02
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and servicing unit. See Fig. 7 — on page 8 for minimum required distances between unit and walls or
ceilings.
Piping
IMPORTANT: Both refrigerant lines must be insulated separately.
Table 3 lists the pipe sizes for the indoor unit. Refer to the outdoor unit installation instructions for other allowed piping lengths and
refrigerant information.
Table 3 — Indoor Unit Pipe Sizes
WIRING
All wires must be sized per NEC (National Electrical Code) or
CEC (Canadian Electrical Code) and local codes. Use the 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.
Per caution note, only stranded copper conductors with a 600 volt
rating and double insulated copper wire must be used. The use of
BX cable is not recommended.
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.
Recommended Connection Method for Power and
Communication Wiring (To minimize communication wiring
interference) Power 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.
UNIT SIZE 9K (115) 12K (115V) 9K (208/230V) 12K (208/230V) 18K (208/230V) 24K (208/230V)
Gas Pipe
in 3/8 1/2 3/8 1/2 1/2 5/8
(mm) 9.52 12.7 9.52 12.7 12.7 16
Liquid Pipe
in 1/4 1/4 1/4 1/4 1/4 3/8
(mm) 6.35 6.35 6.35 6.35 6.35 9.52
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.
Use copper conductors only with a 600 volt rating and double
insulated copper wire.
CAUTION