TM 9-4120-401-14
2-8. OPERATION IN VENTILATE MODE (NO HEATING OR COOLING NEEDED)
a. Turn MODE selector rotary switch to VENTilate.
Figure 2-5. Control Panel.
NOTE
The fabric, cover must be rolled up and secured if fresh air damper (door) is to be
opened for make-up fresh air. When using make-up fresh air, a window, door or
vent should be opened in the room or enclosure.
b. Adjust fresh air damper to desired setting. The unit can be operated in the VENTilate mode with the fresh
air damper (door) closed, open, or partially open.
NOTE
To pull in maximum fresh (outside) air, close conditioned air intake grille.
c. Adjust Iouvers to suit.
2-9. OPERATION IN HEAT MODE.
a. Turn MODE selector rotary switch to HEAT position.
b. Turn TEMPERATURE control potentiometer fully to the WARM position.
NOTE
Fresh (outside) air cannot be introduced with fabric rover rolled down.
An overheat thermostat located near the heating elements will turn them off if the
temperature in the heater compartment reaches an excessive level.
c. When room or enclosure temperature reaches the desired level, slowly turn t he TEMPERATURE control
potentiometer toward COOL. Heating will stop when you reach the approximate room temperature. Further
adjustment can be made by turning the TEMPERATURE control potentiometer slightly toward HEAT or COOL
until desired temperature is controlled automatically.
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.
