Unit Installation
Fig. 13 Flexible Conduit
Wire Clamp
Secure
Flexible
Conduit
During Field
Installation
Strain-Relieving Flexible Conduit
as Shipped from the Factory
5.9.2 Power Supply and Ground Connections
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.
The unit is provided with concentric knockouts for attaching
common trade
sizes 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
the following instructions for power leads and
ground connection depending on unit options.
5.9.2.1 Standard Units
For standard models, power is connected to the line (L) side of
the compres
sor contactor and the ground to the ground lug in the
unit electrical box.
5.9.2.2 Units with Disconnect Switch
For models with unit-mounted disconnect switches, connect the
field power
to the marked terminals on the disconnect switch,
and the ground to the ground lug or terminal block (in the case of
460V with a constant airflow motor) in the disconnect switch
box.
5.9.2.3 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 must be connected to
the terminal block located in a dedicated electrical box.
5.9.2.4 Units with 100kA SCCR option
For units with the 100kA SCCR option, the power supply must be
connected to th
e fuse block located in a dedicated fuse box.
5.9.2.5 460-V Models with Constant Airflow Motors
460V heat pumps with constant airflow motors require five
power suppl
y wires: the standard three high-voltage wires, the
ground wire, and a neutral 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.
5.9.3 Transformer Settings for 208/230-V Units
All 208/230-V units are factory wired to 230V by default. For Job
sites with a 208-V
power 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.
5.10 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.
5.10.1 Thermostat
Unless provided with DDC controls, the CL heat pump can be
controlled b
y most commonly available single-stage heat pump
thermostats.
The reversing valve on the CL series is energized when the unit is
in cooling m
ode. Position thermostats on an interior wall away
from supply ducts.
Avoid external walls and locations subject to direct sunlight and
drafts. Therm
ostat wiring must be 18AWG (American Wire
Gauge). Refer to the installation instructions of the thermostats
for further details.
Refer to the installation instructions for the thermostat for further
details.
20 |
CL Series Heat Pumps — 8733838716 (2024/05)
To Next Page
Loading...
Need help?
General