Cooling Operation - TM-9-4120-430-140042

TM 9-4120-430-14

0005 00

8. Turn the temperature selector switch to WARMER. See Figure 3.

9. Position circuit breaker to ON, and check that the green POWER ON light is lit.

10. Position the mode selector switch to VENT, then position the mode selector switch to COOL.

Cooling Operation

CAUTION

Do not operate the air conditioner in cool mode if the refrigerant is at a low level or if bubbles

appear in sight glass. Equipment damage can result.

Compressor will begin operation. Allow 60 seconds delay for compressor to start. After starting the air conditioner for

cooling operation:

1. Leave the mode selector switch on COOL.

2. Adjust the temperature selector switch from WARMER to COOLER to select the degree of cooling desired. See

Table 1 Operator Control Setting.

3. Adjust the evaporator discharge louvers individually to direct the airflow as desired.

NOTE

Cool air is denser than warm air so it has a tendency to flow downward. To offset this

tendency, it is often advisable to adjust the evaporator discharge louvers to direct the cool air

slightly upward.

NOTE

To open the ventilation damper door to admit fresh air, unlock the ventilation damper control

chain, pull the door to an open position (against spring closure) and secure chain in slot.

Cooling With Fresh Air

1. When the ventilation damper door is open to admit fresh air, partially close the evaporator intake louver to balance

the incoming air.

2. Keep the ventilation damper door closed during heavy rain.

Stopping The Air Conditioner

1. Position the mode selector switch to OFF.

2. Adjust the ventilation damper control chain to close the damper door.

0005 00-4