4
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and unit servicing. See Fig. 4 for the minimum required distances between the unit and the walls or ceilings.
PIPING
IMPORTANT: Both refrigerant lines must be insulated separately.
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Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).
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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
SYSTEM SIZE
9K
12K
18K
24
K
36K
48K
Piping
Gas Pipe (size - connection
type)
In. (mm)
3/8 (9.52)
1/2 (12.7)
1/2 (12.7)
5/8 (16)
5/8 (16)
5/8 (16)
Liquid Pipe (size - connection
type)
In. (mm)
1/4 (6.35)
1/4 (6.35)
1/4 (6.35)
3/8
(9.52)
3/8
(9.52)
3/8
(9.52)
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
Power and Communication Wiring: (09K through 24K)
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 exist,
a 14/2 stranded shielded wire can be used to replace L2 and (S)
between outdoor unit and indoor unit − landing the shield onto
ground in the outdoor unit only.
Recommended Connection Method for Power and
Communication Wiring (36K through 48K) 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.
Wires should be sized based on NEC and local codes.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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Be sure to comply with local codes while running wire
from indoor unit to outdoor unit.
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Every wire must be connected firmly. Loose wiring may
cause terminal to overheat or result in unit malfunction.
A fire hazard may also exist. Ensure all wiring is tightly
connected.
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No wire should touch refrigerant tubing compressor or
any moving parts.
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Disconnecting means must be provided and shall be
located within sight and readily accessible from unit.
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Connecting cable with conduit shall be routed through
hole in the conduit panel.
