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H
K
S
EAT
IT
ELECTION
For heat kit selection, see the Specification Sheet for each
specific Air Handler.
12 ELECTRICAL AND CONTROL WIRING
IMPORTANT: All routing of electrical wiring must be made through
provided electrical knockouts. When removing the electircal
knockouts, take care not to damage the PCB. Do not cut, punc-
ture or alter the cabinet for electrical wiring.
FIRE HAZARD!
To avoid the risk of property damage, personal injury
or fire, use only copper conductors.
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
HIGH VOLTAGE!
To avoid property damage, personal injury or death
due to electrical shock, this unit MUST have an
uninterrupted, unbroken
electrical ground circuit may consist of an
appropriately sized electrical wire connecting the
ground lug in the unit control box to the building
electrical service panel.
Other methods of grounding are permitted if performed
in accordance with the National Electric Code
(NEC)/American National Standards Institute
(ANSI)/National Fire Protection Association (NFPA) 70
and local/state codes. In Canada, electrical grounding
is to be in accordance with the Canadian Electric Code
(CSA) C22.1.
12.1 Building Electrical Service Inspection
This unit is designed for single-phase electrical supply only.
DO NOT OPERATE AIR HANDLER 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.
electrical ground. The
Nominal
Input
208-240
ELECTRICAL VOLTAGE
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 be sized to carry the Minimum Circuit Am-
pacity (MCA) listed on the equipment's 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.
•Wires with different insulation temperature rating have vary-
ing 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 cor-
rect 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 lo-
cal or state codes for any special regional requirements. Pro-
tection can be in the form of fusing or HACR style circuit break-
ers. 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.
11
Minimum
Maximum
Voltage
Voltage
197
253
Table 7
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