FloAire Indirect Fired Heater - Manual (Page 9)

9
Copper Wire Ampacity
Wire Size AWG Maximum Amps
14 15
12 20
10 30
8 50
6 65
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.
Motorized Intake Damper
On units shipped with the optional motorized intake damper, a power transformer is supplied with the unit
if the main incoming voltage is greater than 120V. The damper motor is automatically energized when
the main disconnect switch is in the ON position. No external wiring to the damper motor is required.
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.