TM-9-2320-387-10

TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113

OPERATOR’S MANUAL

OCTOBER 2001
CHANGE 1
TM-9-2320-387-10

  TM-9-2320-387-10 - Page 170 of 277

TM 9-2320-387-10
2-122
2-50. VEHICULAR HEATER OPERATION
NOTE
The vehicular heater is an optional kit which may or may not be
installed on the vehicle.
a. General.
The vehicular heater is used for pre-heating and boosting the heat
of the water-cooled engine. The heater works in conjunction with the heating system
of the vehicle to heat driver’s cabin, passenger compartment, and to defrost windows
and windshield of the vehicle.
The heater operates independently of the vehicle engine. It is connected to the
coolant circuit or the heating circuit, fuel supply system, and the electrical system of
the vehicle.
When the operating temperature has been reached, the temperature sensor will
send a signal to the control unit. The heat output will then be reduced to 25 percent.
Should the temperature still remain at the upper limit, the heater will turn off, but
the coolant pump will remain running.
The heater will automatically restart once the system temperature has dropped
to the lower switch point of the sensor.
.
WARNING
.
• Do not operate the vehicular heater in a closed area without
proper exhaust evacuations. Damage to heater or injury to
personnel may result.
• Do not operate the vehicular heater when refueling. Damage to
heater or injury to personnel may result.
NOTE
• After shutting off the on/off switch there is a cool down period of
90 seconds. The blower and coolant pump works for 90 seconds
to purge the heater.
• DFA fuel should be used at temperatures below -40°F (-4°C).
b. Operation.
(1)
Activate heater by moving on/off rotary switch (1) on the vehicle control
panel (2) to ON.
(2)
A green light (3) on on/off rotary switch (1) indicates heater is in operation.
(3)
If, during heater operation supplied voltage drops below 10.25 + 0.5/20.5 +
1.0 V for more than 20 seconds, fault lock out will occur and the heater will switch
off. If this happens, notify unit maintenance.


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