RF Unit Installation
NOTICE
All field-installed wiring must comply with the National
Electric Code as well as all applicable local codes.
NOTICE
Properly-sized fusible safety switches or HACR circuit
breakers must be installed for branch circuit protection. See
the unit nameplate for maximum fuse or breaker size.
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.
NOTICE
All high-voltage connections must be torqued as specified by
the component’s manufacturer.
Refer to the unit’s electrical data on the unit’s nameplate for wire
and branch circuit protection sizing. Supply power voltage and
phasing must match the required voltage and phasing shown on
the unit’s nameplate. Operating 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’s wiring diagram for field connection
requirements.
The Electrical Box is designed to swing out of the way allowing for
improved access and servicing of the unit. To ensure proper
swing functionality, it is essential to provide sufficient wire
length. This can be achieved by using flexible conduit installed in
the unit (See Fig. 13) to guide the wire length determination.
Adequate wire length is required to enable full extension or
opening of the control box, up to 90 degrees.
Fig. 13 Flexible Conduit
Wire Clamp
Secure
Flexible
Conduit
During Field
Installation
Strain-Relieving Flexible Conduit
as Shipped from the Factory
5.10.2 Power Supply and Ground Connections
To minimize the transmission of vibration from the unit cabinet to
the building, e
nclose the power wiring to the heat pump in a
flexible conduit.
The unit is provided with concentric knockouts for attaching
common trade s
izes of conduit. Route the power-supply wiring
through the knockout opening and the flexible conduit inside the
unit. After the field wiring is routed to the electrical box, ensure
the wire clamp is tightened to secure the flexible conduit to the
electrical box. (See Fig. 13.) Always connect the ground lead
to the grounding lug provided in the unit. Follow the unit’s wiring
diagram and th
e following instructions for power leads and
ground connection depending on unit options.
5.10.2.1 Standard Units
For standard models, power is connected to the line (L) side of
the compress
or contactor and the ground to the ground lug in the
unit electrical box.
CAUTION
The unit ground wire must never be used as a neutral wire.
5.10.3 Transformer Settings for 208/230-V Units
All 208/230-V units are factory wired to 240V by default. For job
sites with a 208-V po
wer supply, the primary leads on the unit
transformer will need to be changed from 240V to 208V. Refer to
the unit wiring diagram for details.
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RF Series Heat Pumps — 8733980022 (2024/12)
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