9
Copper Wire Ampacity
Wire Size AWG
Maximum Amps
14
15
12
20
10
30
8
50
6
65
4
85
Electrical
Before connecting power to the heater, read and understand this
entire section of this document. As-built wiring diagrams are
furnished with each fan by the factory, and are attached to the
door of the unit.
Electrical wiring and connections should be done in accordance
with local ordnances and the National Electric Code,
ANSI/NFPA70. Be sure the voltage and phase of the power
supply and the wire amperage capacity is in accordance with the
motor 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 a
heater. Lock and tag the disconnect switch or breaker to
prevent accidental power up.
2. An electrical drop containing the motor power wiring is
shipped with every fan. 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 mentioned above and
connected as shown in a following
illustration labeled “Fan to Building
Wiring Connection”.
4. Make certain that the power source
is
compatible
with
the
requirements of your equipment.
The heater nameplate identifies
the proper phase and voltage of
the motor.
5. Units shipped with an optional
remote panel have two electrical
circuit drops. It is important to run
the motor wires in a separate conduit from the remote control wiring. The DC wires from the unit
temperature controller, located in the control drop, should either be shielded cable or be run in a
separate conduit.
6. Before connecting heater to the building power source, verify power line wiring is de-energized.
7. Secure the power cables to prevent contact with sharp objects.
8. Do not kink power cable and never allow the cable to come in contact with oil, grease, hot
surfaces or chemicals.
9. Before powering up the heater, check fan wheel for free rotation and make sure that the interior of
the heater is free of loose debris or shipping materials.
10.
If any of the original wire supplied with the heater must be replaced, it must be replaced with type
THHN wire or equivalent.
WARNING!!
Disconnect
power
before
installing or servicing fan. High
voltage
electrical
input
is
needed for this equipment. This
work should be performed by a
qualified electrician.
Summary of Contents for Modular Direct Fired Heaters
Page 2: ......
