INSUFFICIENT COOLING - TM-9-4120-430-140058

TM 9-4120-430-14

0009 00

FAULT PROCEDURE 2. INSUFFICIENT COOLING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSUFFICIENT COOLING

Step 1.

Check to be sure that mode selector switch is properly positioned.

Set switch to COOL.

Step 2.

Make sure that temperature switch is set correctly.

Adjust setting to COOLER.

Step 3.

Determine that sufficient air is passing across evaporator coil by placing a piece of paper in front of

the evaporator air intake louver. The paper should be held against the louver blades by the air.

Open evaporator air intake louver blades. Remove any obstructions from evaporator air intake

and discharge louvers. Direct discharge air louvers away from intake air. Refer to WP 0011 00.

Step 4.

Make sure that there is not too much outside air entering unit.

Close or adjust fresh air damper door.

Step 5.

Check liquid sight indicator to see whether there is sufficient refrigerant in the system.

If sight glass is not full and clean, report to Direct Support Maintenance Personnel.

Step 6.

Check to see that sufficient air is passing through condenser coil by placing a piece of paper on the

condenser guard. The paper should be held against the guard by the air.

Remove any obstructions from condenser inlet and outlet. Make sure that condenser discharge

louver vane outlets are open and directed away from the condenser coil (preventing recirculation

of hot air). Refer to WP 0021 00.

FAULT PROCEDURE 3. NO HEAT OR LOW HEAT

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

NO HEAT OR LOW HEAT

Step 1.

Check to be sure that mode selector switch is properly positioned.

Set switch to HEAT.

Step 2.

Make sure that temperature selector switch is set correctly.

Adjust setting to warmer.

Step 3.

Check for sufficient air movement over heaters by placing a piece of paper in front of the evaporator

air intake louver. The paper should be held against the louver by the air.

Remove any obstructions from evaporator air intake and discharge louvers. Make sure that

evaporator air intake louver blades are open. Direct discharge air louvers away from intake air.

Refer to WP 0011 00.

Step 4.

Make sure that there is not too much outside air entering unit.

Close or adjust fresh air damper door.

0009 00-2