22
Wiring
Figure 26: Typical Single-Stage Thermostat And Dual-Fuel
Application
4.10 Power Wiring
It is important that proper electrical power is
available at the heat pump power terminal block. The
acceptable operating voltage range is shown in Table
8.
Table 8: Voltage Ranges (60 Hz)
Nameplate
Voltage
Operating Voltage Range at
Maximum Load Conditions
208/230 197-253
1. Install a branch circuit disconnect within sight
of the unit and of adequate size to handle the
minimum circuit ampacity (MCA) current (see
“Electrical Data” in Section 3.2).
2. Field wiring must comply with the National Electric
Code (C.E.C. in Canada) and any applicable local
code.
3. Power wiring must be run in a rain-tight conduit.
Conduit must be attached to the hole in the
bottom of the control box.
4. Connect power wiring to line-voltage lugs on the
terminal block located in the outdoor heat pump
unit electrical box. (See wiring diagram attached
to unit access panel.)
5. Check all electrical connections, including
factory wiring within the unit and make sure all
connections are tight.
6. DO NOT connect aluminum field wire to the line
voltage terminal block.
Figure 27: Ground Lug Locations
4.11 Grounding
WARNING:
The unit must be permanently grounded. Failure
to do so can cause electrical shock resulting in
severe personal injury or death.
A ground 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.
(3) OPTIONAL PLENUM SENSOR.
(4) FOR TWO STAGES, CONNECT W2 ON THERMOSTAT TO W2 ON THE CONTROL BOARD.
(5) EMERGENCY HEAT (E) CONNECTION MAY NOT BE ALLOWED BY LOCAL CODES.
R
C
W1
W/E
Y
(5)
G
W2
B
+
S
–
R
C
W
Y
Y2
1
2
B
W2
R
C
W
Y1
Y2
G
PS
(3)
Outdoor
Sensor
(2)
12 FT.
(3.7 M )
Heat Pump/AC
Outdoor Unit
Typical
Single-Stage
Thermostat
Furnace
Control
(6)
A JUMPER MUST BE WIRED BETWEEN Y1 AND Y2 ON FURNACE TO ASSURE
100% NOMINAL AIRFLOW
.
ST-A1286-04
(6)
(2) FOR REMOTE SENSOR INSTALLATION, SEE THERMOSTAT INSTALLATION INFORMATION.
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