FloAire INDIRECT FIRED BENT TUBE MODULE - Manual (Page 12)

12
Copper Wire Ampacity
Wire Size AWG Maximum Amps
14 20
12 25
10 30
8 40
6 55
Gas Connection Diagram
8. This unit requires a constant 7 in. w.c. minimum natural gas supply, (LP should be 11 in. w.c.
minimum) when the unit is operating at maximum gas flow. If the gas supply exceeds 14 in.
w.c. it will damage the internal valve
components, and if it is below 7 in. w.c., the
heater may not perform to specifications.
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 ordinances 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
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.
NOTICE
Refer to the heater rating
plate for determining the
minimum
gas supply
pressure for obtaining the
maximum gas capacity for
which this heater is specified.