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WIRING
Control Wiring (cont.)
TYPICAL 1-STAGE DUAL FUEL THERMOSTAT AND
DUAL-FUEL APPLICATION
Typical
One-Stage
Furnace
Thermostat
Control
R
C
Y
W2
(4)
W/E
G
B
+
S
–
12 FT.
(3.7 M )
Outdoor
Sensor
NOTES:
(1) FOR PROGRAMMING THERMOSTAT IN DUAL-FUEL APPLICATION, SEE
THERMOSTAT INSTALLATION INFORMATION.
(2) FOR REMOTE SENSOR INSTALLATION, SEE THERMOSTAT INSTALLATION INFORMATION.
(3) OPTIONAL PLENUM SENSOR.
(4) EMERGENCY HEAT (E) CONNECTION MAY NOT BE ALLOWED BY LOCAL CODES.
Field wiring must comply with the National Electric
Code (C.E.C. in Canada) and any applicable local
code.
Power Wiring
It is important that proper electrical power from a
commercial utility is available at the heat pump
contactor. Voltage ranges for operation are shown
below.
VOLTAGE RANGES (60 HZ)
Nameplate Voltage
208/230 (1 Phase)
208/230 (3 Phase)
460
575
Install a branch circuit disconnect within sight of
the unit and of adequate size to handle the starting
current (see "Electrical Data" on page 5.)
24
Heat Pump
Outdoor Unit
R
R
R
C
C
BR
Y
Y
Y
Y/BL
W
PS
D
PR
(3)
G
B
BL
(2)
Operating Voltage Range at Maximum
Load Design Conditions for Compressors
Copeland
187 - 253
187 - 253
414 - 506
517 633
Power wiring must be run in a rain-tight conduit.
Conduit must be run through the connector panel
below the access cover (see page 6) and attached
to the bottom of the control box.
Connect power wiring to line-voltage lugs located
in the outdoor heat pump unit electrical box. (See
wiring diagram attached to unit access panel.)
Check all electrical connections, including factory
wiring within the unit and make sure all connections
are tight.
DO NOT connect aluminum field wire to the
2
Comfort Control
terminals.
Grounding
WARNING:
permanently grounded. Failure to do so can cause
electrical shock resulting in severe personal injury
or death.
A grounding lug is provided near the line-voltage
power entrance for a ground wire.
ST-A1226-09
The unit must be
ST-A1226-09
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