TM 5-4520-256-14
1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - continued.
c.
Heater Interior. (Refer to Figure 1-4).
(1) Centrifugal Fan. The centrifugal fan (1) is a "squirrel cage" fan and provides the motive force for the air.
Both heated air and burner forced air is provided by this fan.
(2) Motor (B 1). The motor (2) drives the centrifugal fan (1) and the fuel pump (3).
(3) Fuel Pump. The fuel pump (3) is driven by the motor (2) and pulls fuel from the internal tank or external fuel
source, pressurizes it, and feeds it into the burner.
(4) Fuel Filter. The fuel filter (4) filters the fuel to remove all dirt and debris.
(5) Fuel Tank. The fuel tank (5) holds 26 gallons of fuel for use by the heater unit.
(6) Fuel Solenoid Valve. The fuel solenoid valve (6) controls the flow of fuel during heater operation.
(7) Heat Exchanger. The heat exchanger (7) contains the burner and provides the means for heating the air
(recirculated or fresh).
(8) Air Filters. The air filters (8) filter out and remove dust, dirt, and debris from the incoming fresh air prior to
heating.
(9) Temperature Controller. The temperature controller (9) detects the temperature of the return air and the
discharge air to compare these readings with the two temperature control adjustment knobs on its housing.
This device will turn on or turn off the burner as determined by the controller's temperature settings and
indications from its sensors.
(10) Motor Starter. The motor starter (10) installed on the Model H83 Heater limits the fan motor inrush current
for 3 seconds at initial power application, thus prevents circuit breaker tripping on the 3 Kw generator.
1-6 Change 3
