24
Wiring
4.0 INSTALLATION
It is important that proper electrical power is
available at the heat pump power terminal block. The
acceptable operating voltage range is shown below.
VOLTAGE RANGES (60 HZ)
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).
Field wiring must comply with the National Electric
Code (C.E.C. in Canada) and any applicable local code.
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 (-)P20
terminal block.
TYPICAL SINGLE-STAGE THERMOSTAT:
HEAT PUMP WITH AIR-HANDLER
4.9 Control Wiring (cont.)
4.10 Power Wiring
TYPICAL SINGLE-STAGE THERMOSTAT AND
DUAL-FUEL APPLICATION
ST-A1241-02-X0
Nameplate
Voltage
Operating Voltage Range at
Maximum Load Conditions
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ST-A1286-03
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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.
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(6) A JUMPER MUST BE WIRED BETWEEN Y1 AND Y2 ON FURNACE TO ASSURE
100% NOMINAL AIRFLOW
.
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ST-A1286-04
(2) FOR REMOTE SENSOR INSTALLATION, SEE THERMOSTAT INSTALLATION INFORMATION.
