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Control Wiring
WARNING:
at the fuse box or service panel before making
any electrical connections� Also, the ground
connection must be completed before making line
voltage connections� Failure to do so can result in
electrical shock, severe personal injury, or death�
Control Wiring
Running low-voltage wires in conduit with line
voltage power wires is not recommended� Low-
voltage wiring may be run through the plastic
bushing provided in the 7/8" [19 mm] hole in the
base panel, up to and attached to the pigtails from
the bottom of the control box� Conduit can be
run to the base panel if desired by removing the
insulated bushing�
A thermostat and a 24-volt, 40 VA minimum
transformer are required for the control circuit
of the system� The furnace or the air handler
transformer may be used if sufficient� See the
wiring diagram for reference. Use "Wire Size" table
to size the 24-volt control wiring�
Do not use phone cord to connect indoor and
outdoor units and thermostat� This could damage
the controls and may not be adequately sized for
the controls electrical load�
FIELD WIRE SIZE FOR 24-VOLT THERMOSTAT CIRCUITS
Thermostat
SOLID COPPER WIRE – AWG.
Load (amps)
3.0
18
16
2.5
18
16
2.0
18
16
20
50
[6]
[15]
Length of Run – Feet [m] (1)
(1) Wire length equals twice the run distance�
NOTICE: Do not use control wiring smaller than No� 18
AWG between thermostat and outdoor unit�
Typical Noncommunicating
Thermostat Wiring Diagrams
The following figures show the typical wiring
diagrams� Cooling airflows may need to be
adjusted for homeowner comfort once the system
is operational�
Turn off electric power
14
12
10
10
10
14
12
10
10
10
14
12
10
10
10
100 150 200
250 300
[30] [46] [51]
[76] [91]
CONTROL WIRING FOR GAS OR OIL FURNACE
FOR TYPICAL GAS OR OIL HEAT
BR – BROWN WIRE
YL – YELLOW WIRE
X – WIRE CONNECTION
TYPICAL CONDENSING
UNIT
YL
X
BR
X
*
IF MAXIMUM OUTLET TEMPERATURE RISE IS DESIRED, IT IS RECOMMENDED THAT
W1 (W/BK) AND W2 (W/BL) BE JUMPERED TOGETHER.
FOR TYPICAL ELECTRIC HEAT
BR – BROWN WIRE
R – RED WIRE
YL – YELLOW WIRE
W/BK – WHITE WIRE WITH BLACK STRIPE
G/BK – GREEN WIRE WITH BLACK STRIPE
PU – PURPLE WIRE (NOT USED)
X – WIRE CONNECTION
TYPICAL CONDENSING
UNIT
YL
X
BR
X
WIRE COLOR CODE
BK – BLACK
GY – GRAY
BR – BROWN
O – ORANGE
BL – BLUE
PR – PURPLE
G – GREEN
R – RED
WIRING
TYPICAL THERMOSTAT
SUBBASE
Y
G
W
R
TYPICAL GAS OR
OIL FURNACE
R
W
G
Y
C
TYPICAL THERMOSTAT
SUBBASE
Y
G
R
W
TYPICAL ELECTRIC HEAT
LOW VOLTAGE JUNCTION BOX
•
X
W/BL
*
X
R
X
W/BK
G/BK
X
YL
X
BR
X
PU
W – WHITE
Y – YELLOW
21
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