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TM 5-4520-253-13
Section Ill. TECHNICAL PRINCIPLES OF OPERATION
O P E R A T I N G P R I N C I P L ES
CONTROL BOX - contains controls and indicators. One control sets in motion a sequence of events
which causes startup and operation of the heater.
CARBURETOR - controls flow of fuel to burner head.
COMBUSTION BLOWER - provides air to mix with fuel for combustion.
HEAT EXCHANGER - provides chamber where fuel is burned and heat generated. Combustion fumes
are exhausted outside enclosure being heated.
VENTILATING AlR MOTOR - rotates fan blades and directs stream of air across heat exchanger and
through screen, Continues operation after heater is turned off at control box until heater has cooled.
Can be used to circulate unheated air.
ELECTRIC FUEL PUMP - not mounted on heater. Pumps fuel from remote supply to fuel inlet.
Change 2 1-5
