4
328 014525201
Specifications subject to change without notice.
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and servicing unit. See Fig. 4 for minimum required distances between unit and walls or ceilings.
Piping
IMPORTANT:
Both refrigerant lines must be insulated separately.
S
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
UNIT SIZE
12K
(208/230V)
18K
(208/230V)
24K
(208/230V)
Gas Pipe
in
3/8
1/2
5/8
(mm)
9.52
12.7
16
Liquid Pipe
in
1/4
1/4
3/8
(mm)
6.35
6.35
9.52
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.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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Wires should be sized based on NEC and local codes.
S
Use copper conductors only with a 600 volt rating and
double insulated copper wire.
