TM 5-2420-232-10
0004
HVAC CONTINUED
Supplementary Cab Heater
0004
CAUTION
Allow supplementary cab heater to cool off for 4 minutes before turning off master battery switch
or damage to heater may occur.
The machine is equipped with a supplementary heating system, which is a self-contained cab mounted heater unit fueled from
the machine s main fuel tank. The heater unit is mounted in the space beneath the passenger seat.
CAUTION
The heater unit is mounted in the space beneath the passenger seat. Do not block the inlet or outlet
grille with equipment or clothing. Serious damage may result from overheating of the heater.
1.
Turn the control knob (Figure 91, Item 6) clockwise to the first notch.
NOTE
There will be a 5-second delay while the heater completes its system self-test. After that, there will
be an approximate 1-minute delay until the heater blows hot air, with maximum heater output
available within 2 minutes.
2.
Turn the control knob (Figure 91, Item 6) clockwise to set the thermostat to the required temperature.
NOTE
If the cab is already up to temperature, the heater will come on and cycle low.
3.
To turn the heater OFF, turn the control knob (Figure 91, Item 6) counterclockwise until it stops. The blower motor may
continue to run for up to 3 minutes as the heater cools down. Once the blower stops running, the heater is completely OFF.
Figure 91. Supplementary Cab Heater - Control Knob
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