TM 9-4120-402-14
2-9.
OPERATION IN HEAT MODE. - continued
c. When room or enclosure temperature reaches the desired level, slowly turn the 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.
Figure 2-9. Fresh Air Damper (Door) Adjustment
e. Adjust grilles to suit. Since warm air tends to rise, it is normally better to adjust the conditioned air discharge
grille slightly downward. The conditioned air intake grille should be fully open.
Figure 2-10. Grille Adjustment
2-16