TM 9-4520-260-13
SECTION II. EQUIPMENT DESCRIPTION AND DATA
1-11. EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES.
a. The heater is designed to operate from a 28 VDC source. The heater has a maximum output of 15,000 British
Thermal Units (BTU) per hour. The heater is designed for wall or floor mounting. Heater control is provided by a
remotely controlled room thermostat to maintain temperature within 35 to 95F (1.7 to 35 ) up to the rated output of
C
the heater.
b. The heater is equipped with a removable discharge louver for directing the outlet air. A screened air inlet opening
provides entry of circulating air. Combustion air for the burner head is provided by a separate blower and enters the
heater through the rain shield at the rear of the heater.
c. The Electronic Control Unit (ECU) controls the starting and stopping of the heater as the room thermostat reaches
its desired setting.
d. The proper fuels (Item 7, Appendix E) to use at various ambient temperatures are listed in Table 1-2.
Table 1-2. Types of Fuel
Ambient Temperature
Specification
Military Symbol
Above 20 (-6.70C)
F
VV-F-800
DF-2
+20 (-6.7 ) to -25 (-32.2 )
F
C
F
C
VV-F-800
DF-1
Below -25 (-32.20C)
F
VV-F-800
DF-A
1-12. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.
a. Cover Panels (1). The side cover panel and the top cover panel are interchangeable to provide alternate air intake
installation.
b. Rain Shield (2). The rain shield provides combustion air intake to the burner. It has a removable rain shield cover.
The rain shield cover is reversible for use in outside installations.
c. Bulkhead Fitting (3). The bulkhead fuel inlet fitting is mounted to the back of the case and to the strainer to
provide fuel to the fuel pump.
d. Control Panel (4). The control panel controls the heater operation with an ON-OFF switch, a reset circuit breaker,
a fuse, a spare fuse holder, a power receptacle, and a thermo receptacle.
e. Fuel Pump (5). The 28 VDC pulsating-type electric fuel pump draws fuel from the strainer and fuel supply and
pumps it to the carburetor. A filter removes contaminants which may have passed through the strainer.
f. Ignition Pack (6). The ignition pack converts 28 VDC input to the high voltage output necessary to provide a hot
spark at the igniter in the burner head. This spark ignites fuel vapors to start combustion. A shielded high voltage cable
connects the secondary of the ignition pack to the igniter.
g. Burner (7). The burner head is mounted to the heat exchanger. It provides mounting for the glow plug, igniter, and
carburetor. Combustion air is supplied to the burner head by the motor fan assembly. The air and fuel mixture ignites in
the burner head combustion chamber.
h. Strainer (8). The strainer traps and holds dirt, moisture, and other contaminants to keep them from entering the
heater fuel system. A metal disc-type element is contained in the sediment bowl.
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