24
Wi
ring
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)
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.)
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
Comfort Control
2
terminals.
Grounding
WARNING:
The unit must be
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.
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.
R
C
W2
W/E
Y
G
B
+
S
–
R
C
D
Y
B
R
C
W
Y
G
PS
(3)
Outdoor
Sensor
(2)
12 FT.
(3.7 M )
R
BR
Y
Y/BL
PR
BL
Heat Pump
Outdoor Unit
Typical
One-Stage
Thermostat
Furnace
Control
(4)
ST-A1226-09
TYPICAL 1-STAGE DUAL FUEL THERMOSTAT AND
DUAL-FUEL APPLICATION
Operating Voltage Range at Maximum
Nameplate Voltage
Load Design Conditions for Compressors
Copeland
208/230 (1 Phase)
187 - 253
208/230 (3 Phase)
187 - 253
460
414 - 506
575
517 633
ST-A1226-09
WIRING
Control Wiring (cont.)
