Operation In LO HEAT Mode (Cont)

TM 5-4120-393-14

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 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.

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 warm-up periods.

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 full open.

CAUTION

The unit should not be left unattended when using the HI HEAT mode. Three of the

heaters are not thermostatically controlled and will continue to produce heat until

the safety switch cuts them off at 194F (90 C).

NOTE

An overheat thermostat located near the heating elements will turn them off if the

temperature in the heater compartment reaches an excessive level.

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