33
Electrical
Before connecting power to the control, read and understand the entire section of this document. As-built
wiring diagrams are furnished with each control by the factory and are attached either to the door of the
unit or provided with a paperwork packet.
Electrical wiring and connections must be done 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.
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. Verify wiring to the fan or VFD (if fan mounted) is secured or clamped away from fan blades.
3. A means of disconnecting power to the fan must be located within visual sight of the fan and
outside of the perimeter of the blades. Ideally, this disconnect is located at ceiling level, a
minimum of 3 feet outside the perimeter of the blades.
4. Verify that the power source is compatible with the requirements of your equipment. The fan
nameplate identifies the proper phase and voltage of the motor.
5. Before connecting the unit to the building’s power source, verify that the power line wiring is de-
energized.
6. Secure the power cable to prevent contact with sharp objects.
7. Do not kink power cable and never allow the cable to encounter oil, grease, hot surfaces, or chemicals.
8. 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.
9. Multi-strand thermostat wire must be used to wire the Room temperature sensors back to the main
panel.
10. If motors are spinning in the incorrect direction, switch any two wires on the output of the variable
frequency drive. Alternatively, fan rotation can be changed in software, as described later in this
manual.
11. If any of the original wire supplied with the fan 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 3 - Copper Wire Ampacity
Wire Size AWG Maximum Amps
14 15
12 20
10 30
850
665
485
3100
2115
1130
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