TM 9-4120-405-13&P
2-10. GENERAL OPERATION OF CONTROLS.
Air Conditioner. Do not adjust controls unnecessarily. When the controls are properly set (refer to paragraph 2-9), the
unit will automatically control the temperature. The temperature control thermostat on the control module operates like a
conventional room thermostat except that the temperature scale is not marked on the control module. The thermostat has
a control range of 40 F to 90 F (5C to 32C). The centered position of the control knob would be approximately 65F
(18C). The full INCREASE (warmer) would be 90 F (30C). The full DECREASE (cooler) would be 40F (5C). When
the control module is mounted in the unit, the control temperature is sensed at the conditioned air inlet. When the control
module is mounted in a remote location (away from the unit) the temperature is sensed at the location.
(a) During Cold or Hot Weather:
Adjust shades, blinds, etc. (when applicable) to admit sunlight during day. Close them at night.
(b) During Hot Weather:
Adjust shades, blinds, etc. (when applicable) to block out sunlight during day.
Air conditioner.
a. Turn mode selector switch to VENTILATE.
b. Adjust vent control to fully closed position.
NOTE
While in ventilation mode, air conditioner only recirculates shelter air.
2-12. OPERATION IN LO HEAT MODE.
Air Conditioner. In the LO HEAT mode three thermostatically controlled heaters are activated. To operate the unit in
LO HEAT mode, perform the following steps.
a. Turn mode selector switch to LO HEAT.
b. Turn temperat ure control thermostat knob as far as it will go in the INCREASE (warmer) position.
NOTE
For faster warm up, start unit in HI HEAT mode. In moderate temperature, unit can
then be switched back to LO HEAT.
c. When room or enclosure temperature reaches the desired level, slowly turn the temperature control thermostat
knob toward DECREASE (cooler). Heating will stop when you reach the approximate room temperature. Further
adjustment can be made by turning the temperature control thermostat knob slightly toward INCREASE (warmer) or
DECREASE (cooler) until desired temperature is controlled automatically.
2-18
