TM-9-2350-311-10

TM 9-2350-311-10

2–20 OPERATION IN UNUSUAL ENVIRONMENT/WEATHER — CONTINUED

2-20.4 Operation in Extreme Cold — Continued

b. Starting Coolant Heater

NOTE

After coolant heater starts, it will keep working as long as there is fuel, electric current, air, and a

flow of engine coolant. Coolant heater will automatically stop if coolant temperature reaches

245° F.

Turn HI/LO switch (4) on heater control box (2) to HI.

Hold START/RUN/OFF switch (5) at START.

Press-to-test light (1) will illuminate, indicating coolant heater (6) is operating. Immediately move

START/RUN/OFF switch (5) to RUN position without hesitating in the OFF position.

Set HI/LO switch (4) for desired rate of heat. If set at Hl, coolant heater (6) will automatically go to low

heat when coolant temperature reaches 190° F. If coolant temperature falls below 120° F, heat control

will return to high. LOW position is suitable when coolant heater must burn for an extended period of

time.

c. Stopping Coolant Heater

Place START/RUN/OFF switch (5) in OFF position. Coolant heater (6) will go to purge cycle. Fuel will shut off and

burning will stop, when remaining fuel in coolant heater is exhausted. Blower will run at low speed until coolant heater is

cool and then coolant heater will completely shut down.

d. Cold Weather Starting (Vehicles with Engine Model 7083-7396)

NOTE

Cold weather starting procedures are to be used at 30° F (–1° C) and below. FLAME HEATER

control switch and STARTER control switch must be activated at the same time.

If using winterization kit, stop coolant heater (6) before trying to start engine. Remove tarpaulins and roll

into smallest tube form. Secure tarpaulins with webbing assemblies. Install exhaust outlet plug (3).

Charge batteries (especially after 24 hours of winterization kit operation).

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