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HIGH VOLTAGE!
To avoid property damage, personal injury or death due to elec-
trical shock, this unit MUST have an uninterrupted, unbroken
electrical ground. The 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.
Other methods of grounding are permitted if performed in accor-
dance with National Electric Code (NEC)/American National Stan-
dards 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.
Nominal
Minimum
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 Cir-
cuit Ampacity (MCA) listed on the equipment's Rat-
ing Plate.
•
Refer to the NEC (USA) or CSA (Canada) for wire siz-
ing. The unit MCA for the air handler and the optional
electric heat kit can be found on the unit Series and Rat-
ing Plate.
•
Wire must be sized to allow no more than a 2% volt-
age drop from the building breaker/fuse panel to the
unit.
•
Wires with different insulation temperature rating 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.
WARNING
Maximum
Voltage
Voltage
197
253
TABLE 8
12.3 Maximum Overcurrent Protection (MOP)
Every installation must include an NEC (USA) or CEC (Can-
ada) approved overcurrent protection device. Also, check
with local or state codes for any special regional require-
ments. 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.
12.4 Electrical Connections – Supply Voltage
IMPORTANT NOTE: USE COPPER CONDUCTORS
ONLY.
Knockouts are provided on the air handler top panel and
sides of the cabinet to allow for the entry of the supply
voltage conductors, as shown in Figure 13. If the knock-
outs on the cabinet sides are used for electrical conduit,
an adapter ring must be used in order to meet UL1995
safety requirements. An NEC or CEC approved strain
relief is to be used at this entry.
12.4.1 Air Handler Only (Non-Heat Kit Models)
The power supply connects to the stripped black and
red wires contained in the air handler electrical com-
partment. Attach the supply wires to the air handler
conductors as shown in the unit wiring diagram us-
ing appropriately sized solderless connectors or other
NEC or CEC approved means. A ground lug is also
provided in the electrical compartment. The ground
wire from the power supply must be connected to this
ground lug.
12.4.2 Air Handler - Non-Circuit Breaker Heat Kits
A terminal block is provided with the HKS kit to attach
the power supply and air handler connections. Follow
the HKS Installation Manual and wiring diagram for
complete wiring details.
12.4.3 Air Handler With Circuit Breaker Heat Kit
The air handler has a soft plastic cover on the upper
access panel and can be removed to allow the heater
kit circuit breaker to be installed. The circuit breakers
have lugs for power supply connection. See the HKS
Installation Instructions for further details.
11
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