TM 9-4120-404-14
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 fully open.
f. During periods of very cold weather the fabric cover should be rolled down and snapped.
CAUTION
Interior components may be damaged by heating elements and cause unit to fail.
After operation in HEAT mode, always run unit in VENT mode for one minute
before turning unit off.
To operate the unit in the COOL mode, perform the following steps.
2-10. OPERATION IN COOL MODE.
CAUTION
Fabric cover must be rolled up and secured. 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 COOL 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 WARM. Cooling will stop when you reach the approximate room temperature. Further adjustment can be
made by turning the temperature control thermostat knob slightly toward COOL or WARM until desired temperature is
controlled automatically.
e. Adjust louvers to suit. Since cold air tends to flow downward, it is normally better to adjust the conditioned air
outlet louvers slightly upward. The conditioned air inlet louvers should be fully open.
2-11. RESETTING AIR CONDITIONER. If either the logic box assembly or the motor controller detects a problem with
the input power or overheating of the motor controller, the air conditioner shuts off automatically and a fault indicator light
is illuminated on the control panel. If the fault light indicates an input power problem, check input power for proper voltage
and frequency and correct for proper input power. After problem has been corrected, turn mode selector switch to the
RESET position for one minute and then attempt to restart unit. If unit shuts off again automatically or if fault light
indicates an over temperature problem, notify unit level maintenance.
2-13
