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TM 9-4120-389-14
2-10. OPERATION IN HI HEAT MODE.
In the HI HEAT mode, six heaters are activated. Three are thermostatically controlled. Three operate all of the
time.
a.
Turn mode selector switch to HI HEAT.
b.
Turn temperature control thermostat knob as far as it will go in the WARMER position.
Figure 2-11. HI HEAT Control Setting
c.
When room or enclosure temperature reaches the desired level, slowly turn the temperature
control thermostat knob toward COOLER. Make small adjustments until desired temperature is maintained
automatically.
NOTE
Should unit continue to produce too much heat with temperature control thermostat
knob adjusted toward the COOLER setting, switch to start LO 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 the very cold weather and during fast warmup periods.
2-25
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