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TM 5-4210-220-12
1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS. - Continued
p. Winterization System. The winterization system comprises a combustion-type water heater (winterlzation
heater), a water-to-air heat exchanger with blower fan (pump body heater), a water-to-air heat exchanger (battery heater),
water and foam tank heat exchanger elements, and pumping connecting all of these components to the engine cooling
system and the APU-driven circulation pump, (see fig. 1-5). The water tank to pump suction pipe is also equipped with a
water/water heat exchanger. The system is provided to keep the cab and engine coolant warm, without running the main
engine. In addition, it maintains the temperature of the firefighting system above freezing when the truck is on
emergency stand-by in cold weather. Engine coolant is heated by the winterization heater and circulated through the
main engine, cab heater, water and foam tanks, battery heater and the pump body heater. The winterizatlon heater
draws its fuel from the main engine fuel tank Electrical power for operation is provided from the truck batteries.
Figure 1-15. Winterization System Components
Change 7 1-17
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