
16
CONTROL WIRING
(See Figure 2)
If the low voltage control wiring is run in conduit with the power supply, Class I insu-
lation is required. Class II insulation is required if run separate. Low voltage wiring
may be run through the insulated bushing provided in the 7/8 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.
NOTE: Use No. 18 AWG solid copper wire at a minimum. If the wire length between
the thermostat and the unit is more than 100 ft., use 16 AWG solid copper wire to
avoid excessive voltage drop.
A thermostat and a 24 volt, 40 VA minimum transformer are required for the control
circuit of the condensing unit. The furnace or the air handler transformer may be
used if sufficient. Verify the correct primary voltage tap is used on the transformer.
NOTE: Reference unit wiring diagram for detailed wiring instructions.
FIGURE 2
C
ONTROL WIRING FOR GAS OR OIL FURNACE
FOR TYPICAL ELECTRIC HEAT
FOR TYPICAL GAS OR OIL HEAT
C
Y
Y
G
C
Y
R
R
W
L
R
W/BL
R
W/BK
G/BK
YL
BR
PU
YL/BL
LYG
W
R
Y2
TYPICAL THERMOSTAT
SUBBASE
TYPICAL GAS OR
OIL FURNACE
TYPICAL CONDENSING
UNIT
B
R – BROWN WIRE
Y
L – YELLOW WIRE
X
– WIRE CONNECTION
W
/RD – WHITE/RED
R
D – RED WIRE
W/RD – WHITE/RED
BR – BROWN WIRE
R
D – 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
*
IF MAXIMUM OUTLET TEMPERATURE RISE IS DESIRED, IT IS RECOMMENDED THAT
W1 (W/BK) AND W2 (W/BL) BE JUMPERED TOGETHER.
W/RD
RD
YL
BR
YL/BL
TYPICAL CONDENSING
UNIT
W/RD
RD
YL
BR
YL/BL
X
X
X
X
X
X
X
X
X
X
X
X
X
Y2
X
•
X
LYG
W
R Y2
TYPICAL THERMOSTAT
SUBBASE
X
TYPICAL ELECTRIC HEAT
LOW VOLTAGE JUNCTION BOX
C
Y2
X
Y2
L
•
*
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