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TM 5-4120-377-14
2-9. OPERATION IN LO HEAT MODE
In the LO HEAT mode three thermostatically controlled heaters are activated.
a. Turn mode selector switch to LO HEAT.
b. Turn TEMPerature control thermostat knob as far as it will go in the INCREASE (warmer) position.
Figure 2-8. LO HEAT Control Setting
NOTE
For faster warmup start unit in HI HEAT mode. In moderate temperatures, 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. Heating will stop when you reach the approximate room temperature.
Further adjustment can be made by turning the TEMPerature control thermostat knob slightly toward
lNCREASE (warmer) or DECREASE (cooler) until desired temperature is controlled automatically.
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.
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.
Figure 2-9. Fresh Air Damper (Door) Adjustment
2-15
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