TM 9-4120-405-13&P
NOTE
Should unit fail to heat the room or enclosure to the desired temperature or fail to
maintain the desired temperature with temperature control thermostat set in
maximum INCREASE position, switch to HI HEAT.
NOTE
An overheat thermostat located near the heating elements will turn them off if the
temperature in the heater compartment reaches an excessive level.
d. Adjus t vent control to fully closed position.
2-13. OPERATION IN HI HEAT MODE.
Air Conditioner. In the HI HEAT mode, six heaters are activated. Three are thermostatically controlled. Three of these
heater elements operate all of the time. To operate the unit in the HI HEAT mode, perform the following steps.
a. Turn mode selector to HI HEAT.
b. Turn temperature control thermostat knob as far as it will go in the INCREASE (warmer) position.
c. When room or enclosure temperature reaches the desired level, slowly turn the temperature thermostat knob
toward DECREASE (cooler). Make small adjustments until desired temperature is maintained.
NOTE
Should unit continue to produce too much heat with temperature control
thermostat knob adjusted toward the DECREASE (cooler) setting, switch to LO
HEAT.
d. Adjust vent control to fully closed position.
e. During periods of very cold weather, the fabric cover should be rolled down and snapped.
NOTE
An overheat thermostat located near the heating elements will turn them off if the
temperature in the heater compartment reaches an excessive level.
2-14. OPERATION IN COOL MODE.
Air Conditioner. To operate the unit in the COOL mode, perform the following steps.
CAUTION
Fabric cover must be rolled up and secured with ties. If fabric cover is not rolled
up, a high temperature/high pressure condition will occur within the unit which
may damage the compressor or cause the unit to stop functioning.
a. Turn mode selector switch to COOL.
b. Turn temperature control thermostat knob as far as it will go in the DECREASE (cooler) position.
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