Section Ill. Troubleshooting

TM 5-4120-355-14

Section Ill. Troubleshooting

3-3. General.

a. This section contains troubleshooting information for locating and correcting most of the operating troubles

which may develop in the air conditioner. Each malfunction for an individual component, unit or system is followed by

a list of tests or inspections which will help you to determine corrective actions to take. You should perform the tests/

inspections and corrective actions in the order listed.

b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a

malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.

c. The table lists the common malfunctions which you may find during the operation or maintenance or the air

conditioner or its components.

3-4. Troubleshooting

Troubleshooting of the air conditioner is given in table 3-2.

NOTE: Before you use this table, be sure you have performed all applicable operating checks.

Table 3-2. Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

COMPRESSOR FAILS TO START

Step 1. Set selector switch to COOL position (fig. 4-2A).

If compressor does not start, go to step 2.

Step 2. Reset circuit breaker (fig. 2-1).

If compressor does not start, go to step 3.

Step 3. Check if high pressure cutout switch is closed.

Push reset button to reset cutout switch if open.

Step 4. Check if low pressure cutout switch is closed.

Push reset button to reset cutout switch if open

Section IV. MAINTENANCE PROCEDURES

3-5. General

Instructions in this section are published for the information of the operator to maintain the air conditioner.

3-3