11
ELECTRICAL CONNECTIONS
WARNING:
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Beforeservicing,disconnectallelectricalpower
to the air handler.
• Whenservicingcontrols,labelallwiresprior
to disconnecting. Reconnect wires correctly.
• Verifyproperoperationafterservicing.
• 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).
• ForCanadianinstallations,theelectricalconnections
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 specifications on the unit rating plate.
√ Verify that the service provided by the utility is sufficient
to handle the additional load imposed by this equipment.
See the unit wiring label or Table 3 (page 26) for proper
high and low voltage wiring.
√ Verify factory wiring is in accordance with the unit wiring
diagram (Figures 14 - 19, pages 20 - 25). Verify none of
the connections loosened during shipping or installation.
LineVoltage
• 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 field wiring. Any
other wiring methods must be acceptable to authority
having jurisdiction.
• Itisrecommendedthatthelinevoltagetotheunitbe
supplied from a dedicated branch circuit containing the
correct fuse or circuit breaker for the unit.
• Overcurrentprotectionmustbeprovidedatthebranch
circuit distribution panel and sized as shown on the unit
rating label and according to applicable local codes. See
the unit rating plate and Table 3 (page 26) for maximum
circuit ampacity and maximum overcurrent protection
limits.
• The installer should become familiar with the wiring
diagram/schematic before making any electrical
connections to the unit.
• Useonlycopperwireforthelinevoltagepowersupply
to this unit. Use proper code agency listed conduit and
a conduit connector for connecting the supply wires to
the unit. Aluminum supply wire may be used if a heater
kit is installed.
• Ifreplacinganyoftheoriginalwiressuppliedwiththe
unit, the replacement wire must be copper wire consisting
of the same gauge and temperature rating.
• Providepowersupplyfortheunitinaccordancewiththe
unit wiring diagram, and the unit rating plate. Use UL
listed conduit and conduit connectors for connecting the
supply wires to the unit and for proper grounding. Field
supplied bushings for the power supply cables must be
added to support and protect the power supply cables.
• All208/230Voltunitsareshippedfromthefactorywired
for 240 volt operation. For 208V operation, remove the
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V.
Grounding
WARNING:
The unit cabinet must have an uninterrupted
or unbroken electrical ground to minimize
personal injury if an electrical fault should occur.
Do not use gas piping as an electrical ground!
This unit must be electrically grounded in accordance
with local codes or, in the absence of local codes, with
the National Electrical Code (ANSI/NFPA 70) or the CSA
C22.1 Electrical Code. Use the grounding lug provided in
the control box for grounding the unit.
Thermostat/LowVoltageConnections
• Thermostatconnectionsshallbeinaccordancewiththe
instructions supplied with the thermostat and the indoor
equipment. The low voltage wires must be properly
connected to the units low voltage terminal block.
• Asinglestagethermostatisusedwiththisequipment
and must operate in conjunction with any installed
accessories. Typical AC and air handler hookups are
shown in Figure 12 (page 18).
CAUTION:
Isolation must be maintained from the external
Class 2 output of any transformer in a cooling
circuit. Use a thermostat with isolating contacts
to prevent inter-connection of Class 2 outputs.
• Wherelocalcodesrequirethatthethermostatwiring
must be routed through a conduit or raceway, splices
can be made inside the unit; however, all wiring must
be NEC Class 1 and must be separated from incoming
power leads.
• Thethermostatshouldbemountedabout5feetabove
the floor on an inside wall. DO NOT install the thermostat
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