OPERATION IN HEATING MODE

TM 9-4120-428-14

0005 00

Operation in Ventilation Mode - Continued

4. Partially close the evaporator intake louver blades.

5. Position the mode selector switch to VENT.

OPERATION IN HEATING MODE

1. Open the evaporator intake louver by moving the blades up or down as required.

2. Open the evaporator discharge louvers.

3. Turn the ventilation damper actuator to close the damper door.

4. Turn the temperature selector switch to the center position.

5. Position main circuit breaker to ON.

6. Position the mode selector switch to LOW HEAT.

NOTE

In LOW HEAT mode, three heaters will cycle on and off as determined by the

temperature selector switch. In HIGH HEAT mode, three heaters will be on continuously

and three will cycle on and off as determined by the temperature selector switch.

7. Operate in LOW HEAT mode until the temperature selector switch cycles the heaters off indicating that the set point

has been reached. If the temperature does not increase to the set point, position the mode selector switch to HIGH

HEAT.

8. When the temperature selector switch begins cycling the heaters, make any necessary adjustment to it until the

desired shelter temperature is maintained. Allow sufficient time for the heaters to cycle off and on between

adjustments.

NOTE

Warm air is less dense than cool air, so it has a tendency to rise. To obtain comfortable

temperatures near the floor and lower parts of the room, it is often advisable to adjust the

evaporator discharge louver blades to direct the air slightly downward.

9. Adjust the evaporator discharge louver blades to direct the airflow as desired.

OPERATION IN COOLING MODE

1. Open the evaporator intake louver by moving the blades up or down as required.

2. Open the evaporator discharge louvers.

3. Turn the ventilation damper actuator to close the damper door.

4. Turn the temperature selector switch to the center position.

5. Position main circuit breaker to ON.

6. Position the mode selector swi tch to COOL.

NOTE

The compressor operates on a 30 second time delay and will not come on with the fan

and blower motors.

The compressor will operate continuously when in the cool mode. A refrigerant bypass

circuit is activated to direct refrigerant around the evaporator coil when the temperature

selector switch cycles off.

7. Operate the air conditioner until the temperature selector switch cycles the bypass circuit indicating that the set point has

been reached.

0005 00-5