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TM 5-4210-220-12
2-12. OPERATING THE WINTERIZATION SYSTEM. - Continued
e.
To start the Winterization Heater, pull the heater switch (4) OUT.
NOTE
The APU should always be running before the winterization heater is switched ON.
f.
Switch the pump body heater and hose reel blower switch (5) to HIGH or LOW to provide circulation of warm air
inside the pump body and hose reel compartment.
g.
Pull the cab heater control out to allow circulation of coolant through the heater core and set the heater fan
switch to HI Set the DEFROST fan switch to HI to ensure circulation of hot air around cab.
h.
To switch the winterization system off, push the winterization heater switch (4) IN.
j.
Wait 3-5 minutes to let the winterization heater cool, then pull the APU stop control (6). Turn the key switch (1)
to OFF position.
NOTE
When responding to an emergency, start the main engine and then shut down both the
winterization heater and the APU. Continued circulation of coolant through the winterization
heater after it is shut down is necessary to cool the heater. If not cooled adequately the thermal
breaker may trip and prevent restart until the breaker is manually reset. The reset button is
located under the cover on top of the winterization heater. Access to the cover is gained via the
pump body door (7).
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