9
WIRING
Recommended Connection Method for Power and Communi-
cation Wiring (To minimize communication wiring interfer-
ence)
Power Wiring:
The main power is supplied to the outdoor unit. The field supplied
connecting cable from the outdoor unit to 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.
Consult your local building codes and the NEC (National
Electrical Code) or CEC (Canadian Electrical Code) for special
requirements.
All wires must be sized per NEC or CEC 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.
Per caution note, only copper conductors with a minimum 300 volt
rating and 2/64--inch thick insulation must be used.
Communication Wiring:
A separate shielded copper conductor only, with a minimum 300
volt rating and 2/64--inch thick insulation, must be used as the
communication wire from the outdoor unit to the indoor unit.
To minimize voltage drop of the control wire, use the following
wire size and maximum lengths shown in the chart below:
Wire Size
Length
ft (m)
18 AWG
50 (15)
16 AWG
50 (15) to 100 (30)
Alternate Connection Method for Power and Communication
Wiring (May not prevent communication wiring interference)
The main power is supplied to the outdoor unit. The field supplied
connecting cable from the outdoor unit to indoor unit consists of
four (4) wires and provides the power and communication signals
for the indoor unit. Two conductors are for power wiring (L1/L2,
or L/N), one is a ground wire, and one is a DC communication
wire.
Consult your local building codes and the NEC (National
Electrical Code) or CEC (Canadian Electrical Code) for special
requirements. All power wires must be sized per NEC or CEC 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.
Per caution note, only copper conductors with a minimum 300 volt
rating and 2/64--inch thick insulation must be used.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
S
Wires should be sized based on NEC and local codes.
S
Use copper conductors only with a minimum 300 volt
rating and 2/64 inch thick insulation.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
S
Be sure to comply with local codes while running wire
from indoor unit to outdoor unit.
S
Every wire must be connected firmly. Loose wiring
may cause terminal to overheat or result in unit
malfunction. A fire hazard may also exist. Therefore,
be sure all wiring is tightly connected.
S
No wire should be allowed to touch refrigerant tubing,
compressor or any moving parts.
S
Disconnecting means must be provided and shall be
located within sight and readily accessible from the air
conditioner.
S
Connecting cable with conduit shall be routed through
hole in the conduit panel.
The main power is supplied to the outdoor unit. the field supplied
connecting cable from the outdoor unit to indoor unit consists of
four wires and provides the power for the indoor unit as well as the
communication signal between the outdoor unit and indoor unit.
Two wires are high voltage AC power (L1 and L2), one is a
ground wire, and one is a DC communication wire.
CONNECTION DIAGRAMS
S
L
N
115-1-60
Main
Power Supply
115-1-60
1(L)
2(N)
S
L
N
Power to
Indoor Unit
CONNECTING CABLE
OUTDOOR TO INDOOR
GND
Indoor Unit
Power Supply
Ground
Indoor
Signal
High
Voltage
115-1-60
115-1-60
FIELD POWER SUPPLY
GND
Indoor
Signal
High
Voltage
208-230-1-60
9K and 12k 115v INDOOR UNIT
9K and 12k 115v OUTDOOR UNIT
S
L1
L2
Main
Power Supply
208-230-1-30
L1
L2
S
L1
L2
Power to
Indoor Unit
CONNECTING CABLE
OUTDOOR TO INDOOR
GND
Indoor Unit
Power Supply
Ground
Indoor
Signal
High
Voltage
115-1-60
FIELD POWER SUPPLY
GND
Indoor
Signal
High
Voltage
12K to 22K 208-230V OUTDOOR UNIT
12K to 22K 208-230V INDOOR UNIT
208-230-1-30
Notes
:
1. Do not use thermostat wire for any connection between indoor and outdoor units.
2. All connections between indoor and outdoor units must be as shown.
The connections are sensitive to polarity and will result in a fault code.
A14506
Fig. 5 – Connection Diagrams
