12
12 Electrical and Control Wiring
IMPORTANT: All routing of electrical wiring must be made
through provided electrical knockouts. Do not cut, puncture
or alter the cabinet for electrical wiring.
WARNING
HIGH VOLTAGE
WARNING
HIGH VOLTAGE!
12.1 Building Electrical Service Inspection
This unit is designed for single-phase electrical supply
only. DO NOT OPERATE ON A THREE-PHASE
POWER SUPPLY. Measure the power supply to the
unit. The supply voltage must be measured and be in
agreement with the unit nameplate power requirements
and within the range shown.
12.2 Wire Sizing
Wire size is important to the operation of your
equipment. Use the following check list when selecting
the appropriate wire size for your unit.
• Wire used must carry the Minimum Circuit Ampacity
(MCA) listed on the unit’s Series and Rating Plate.
• Refer to the NEC (USA) or CSA (Canada) for wire
sizing. The unit MCA for the air handler and the
optional electric heat kit can be found on the unit
Series and Rating Plate.
• Wire must be sized to allow no more than a 2%
voltage drop from the building breaker/fuse panel to
the unit.
•
have varying ampacities - be sure to check the
temperature rating used.
Refer to the latest edition of the National Electric
Code or in Canada the Canadian Electric Code when
determining the correct wire size.
12.3 Maximum Overcurrent Protection (MOP)
Every installation must include an NEC (USA) or CEC
(Canada) approved overcurrent protection device. Also,
check with local or state codes for any special regional
requirements.
Protection can be in the form of fusing or HACR style
circuit breakers. The Series and Rating Plate provides
the maximum overcurrent device permissible.
NOTE: Fuses or circuit breakers are to be sized larger
than the equipment MCA but not to exceed the MOP.
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