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QV Series Heat Pumps
the unit below the minimum voltage, above the
maximum voltage or with incorrect phasing can
result in poor system performance or damage to
the heat pump. All field wiring must be installed by
qualified and trained personnel. Refer to the unit
wiring diagram for field connection requirements.
To minimize the transmission of vibration from the
unit cabinet to the building, enclose the power
wiring to the heat pump in a flexible conduit. For
heat pumps with unit-mounted disconnect
switches, connect the field power to the marked
terminals on the disconnect switch. For heat
pumps without unit-mounted disconnect switches
(except for 460-volt units noted below and units
with dual power supply), power is connected to
the line (L) side of the compressor contactor and
the ground lug in the unit electrical box.
Units with Dual Power Supplies
For models with dual power supplies, one power
supply feeds the compressor and a second power
supply feeds the unit fan motor and control circuit.
The compressor power supply must be connected
to the line (L) side of the compressor contactor.
The fan motor and control circuit power supply
meets the voltage, amperage and phase
requirements of its load. Refer to the unit name
plates for requirements.
460-V Models with Constant Airflow
Motors
The 460-V heat pumps with the constant airflow
motor option require a properly sized neutral wire
with the power supply wiring in addition to the
three high-voltage wires and the ground wire.
These units employ a 265-V motor that requires
power from one phase of the 460-V supply and the
neutral wire.
CAUTION: The unit ground wire must never
be used as a neutral wire.
Transformer Settings for 208/230-V Units
As a factory built, all 208/230-V operation unless
the wire for 208-V option is ordered. For Job sites
with a 208-V power supply, the primary leads on
the unit transformer will need to be changed from
240-V to 208- V. Refer to the unit wiring diagram for
details.
QV Series Heat Pumps
NOTICE: All high-voltage connections must
be torqued as specified on contactor
specifications
overheating.
WARNING: Power to the unit must be
within the operating voltage range indicated
on
performance data sheet.
NOTICE: Operation of unit on improper line
voltage or with excessive phase imbalance
will be hazardous to the unit, constitutes
abuse and may void the warranty.
Properly-sized fuses or HACR circuit breakers must
be installed for branch circuit protection. See the
unit nameplate for maximum fuse or breaker size.
The unit is provided with a concentric knock-out
for attaching common trade sizes of conduit.
Route power supply wiring through this opening.
Always connect the ground lead to the grounding
lug provided in the control box and power leads to
the line side of compressor contactor as indicated
on the wiring diagrams starting on page #49.
ELECTRICAL—LOW-VOLTAGE WIRING
For heat pumps with a constant-airflow fan motor,
the thermostat wiring is connected to a terminal
strip located on the ECM (Electronically
Commutated Motor) control board, which is
located in the electrical box. Refer to the unit
wiring diagram for connection details.
WARNING: Never route control wiring
through the same conduit as power supply
wiring.
Thermostat
Unless provided with DDC controls, the QV heat
pump can be controlled by most commonly
available single-stage heat pump thermostats.
The reversing valve on the QV series is energized
when the unit is in cooling mode. Position
Subject to change without prior notice
Electrical—Low-Voltage Wiring | 15
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8733829041 (2021/07)
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