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ELECTRICAL WIRING

WARNING:

To avoid risk of electrical shock, personal injury,
or death, disconnect all electrical power to the unit
before performing any maintenance or service.
The unit may have more than one electrical supply.

Label all wires prior to disconnection when
servicing the unit. Wiring errors can cause
improper and dangerous operation

• All electrical connections must be in compliance with

all applicable local codes and ordinances, and with
the current revision of the National Electric Code
(ANSI/NFPA 70).

• For Canadian installations the electrical connections

and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).

Pre-Electrical Checklist:



Verify the voltage, frequency, and phase of the supply

source match the specifi cations on the unit rating plate.



Verify that the service provided by the utility is suffi cient

to handle the additional load imposed by this equipment.
See Table 3 or the unit wiring label for proper high and
low voltage wiring.



Verify factory wiring is in accordance with the unit wiring

diagram (Figures 12 - 13, pages 28 - 29). Verify none of
the connections loosened during shipping or installation.

Line Voltage
• The line voltage to the unit should be supplied from a

dedicated branch circuit containing the correct fuse or
circuit breaker for the unit.

• An electrical disconnect must be located within sight

of and readily accessible to the unit. This switch shall

be capable of electrically de-energizing the outdoor unit.
See unit data label for proper incoming fi eld wiring. Any
other wiring methods must be acceptable to authority
having jurisdiction.

• Use only copper wire for the line voltage power supply

to this unit (Table 4, page 14). Use proper code agency
listed conduit and a conduit connector for connecting
the supply wires to the unit. Use of rain tight conduit is
recommended.

• Provide power supply for the unit in accordance with

the unit wiring diagram and the unit rating plate.

• Overcurrent protection must be provided at the branch

circuit distribution panel and sized as shown on the unit
rating label and according to applicable local codes. See
the unit rating plate for maximum circuit ampacity and
maximum overcurrent protection limits.

• A wiring diagram is located on the inside cover of the

control access panel of the outdoor unit. The installer
should become familiar with the wiring diagram before
making any electrical connections to the outdoor unit.
See Figures 12 - 13.

• If any of the original wires supplied with the unit must

be replaced, they must be replaced with material of the
same gauge and temperature rating.

• Units are shipped from the factory wired for 240 volt

transformer operation. For 208V operation, remove the
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V. Three phase,
460V units are shipped wired for 460V operation.

• Internally mounted circuit breakers are available as fi eld

installed options. These circuit breakers can be used
as an electrical disconnect.

• Connect the line-voltage leads to the terminals on the

contactor (or the circuit breaker if the fi eld installed circuit
breaker kits are used) inside the control compartment.

Table 3. Electrical Data.

Model

Number

Heating Input

(BTUh)

Nominal

Electrical

Supply