TM 9-4120-403-14
NOTE
To pull in maximum of fresh (outside) air, close conditioned air inlet louvers.
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. Switch fan speed switch to HIGH SPEED.
c. 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.
d. When room or enclosure temperature reaches the desired level, slowly turn the TEMPerature control thermostat
knob toward DECREASE and set fan speed switch to LO SPEED. 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.
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.
2-17