TM 9-4120-403-14
e. 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 warmup periods.
Figure 2-9. Fresh Air Damper (Door) Adjustment
f. 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.
Figure 2-10. Louver Adjustment
NOTE
An overheat thermostat located near the heating elements will turn them off if the temperature in the
heater compartment reaches an excessive level.
2-18