TM 9-4120-399-14
2-10. OPERATION IN HI HEAT MODE. Continued.
NOTE
Should unit continue to produce too much heat with temperature control
thermostat knob adjusted toward the DECREASE (cooler) setting, switch
to LOW HEAT.
d. Adjust fresh air damper (door) to desired setting. It is normally better to keep the fresh
air damper slightly open. Damper should be closed during very cold weather and during fast
warmup periods.
e. Adjust louvers to suit. Since warm air tends to rise it is normally better to adjust the
conditioned air outlet louvers slightly downward. The conditioned air inlet louvers should be full
open.
f. During periods of very cold weather the fabric cover should be rolled down and snapped.
NOTE
Fresh (outside) air cannot be introduced with fabric cover down. Close
damper.
An overheat thermostat located near the heating elements will turn them
off if the temperature in the heater compartment reaches an excessive
level.
following steps.
CAUTION
Fabric cover must be rolled up and secured with turn button
fasteners. 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.
c. For faster cool down at initial start-up, fresh air damper (door) should be closed. After
desired cooling temperature is reached, it is normally better to keep the fresh air damper (door)
slightly open. During periods of very hot outside temperatures, it should be closed to improve
efficiency and conserve energy.
d. When room or enclosure temperature reaches the desired level, slowly turn the
temperature control thermostat knob toward INCREASE (warmer). Cooling will stop when you
reach the approximate room temperature. Further adjustment can be made by turning the
temperature control thermostat knob slightly toward DECREASE (cooler) or INCREASE
(warmer) until desired temperature is controlled automatically.
