11
ELECTRICAL
Before connecting power to the heater, read and understand the entire section of this document. As-built
wiring diagrams are furnished with each unit by the factory and are attached to the control module’s door
or provided with paperwork packet.
Electrical wiring (Table 4) and connections must be made in accordance with local ordinances and the
National Electric Code, ANSI/NFPA 70. Verify the voltage and phase of the power supply, and the wire
amperage capacity is in accordance with the unit nameplate. For additional safety information, refer to
AMCA publication 410-96, Recommended Safety Practices for Users and Installers of Industrial and
Commercial Fans.
1. Always disconnect power before working on or near this equipment. Lock and tag the
disconnect switch and/or breaker to prevent accidental power-up.
2. An electrical drop containing the line voltage power wiring is shipped with every unit. The electrical
drop should be brought through one of the conduit openings located in the base of the unit, run
through the curb, and connected to a junction box inside the building.
3. A dedicated branch circuit should supply the motor circuit with short circuit protection according to the
National Electric Code. This dedicated branch should be run to the junction box.
4. Verify that the power source is compatible with the requirements of your equipment. The nameplate
identifies the proper phase and voltage of the equipment.
5. Units shipped with optional remote panels require a second drop through the base of the unit. It is
important to route the motor wires in a separate conduit from the wiring.
6. Before connecting the unit to the building’s power source, verify that the power source wiring is de-
energized.
7. Secure the power cable to prevent contact with sharp objects.
8. Do not kink power cable and never allow the cable to encounter oil, grease, hot surfaces, or chemicals.
9. Before powering up the unit, make sure that the fan rotates freely. Make sure that the interior of the unit
is free of loose debris or shipping materials.
10. If any of the original wire supplied with the unit must be replaced, it must be replaced with type THHN
wire or equivalent.
WARNING!!
Disconnect power before installing or servicing unit. High voltage electrical input is needed for
this equipment. A qualified electrician should perform this work.
Table 4 - Copper Wire Ampacity
Wire Size AWG Maximum Amps
14 15
12 20
10 30
8 50
6 65
4 85
3 100
2 115
1 130
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