TABLE 4-1. ORGANIZATIONAL PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) - continued

TM5-4120-347-14

Para

Item

Item To Be

Ref.

Procedures

No.

Inspected/Serviced

compressor cylinder. Except in extremely

cold conditions, if input power has been

disconnected for a period of less than four

hours, an equal warm-up period should be

allowed, If the disconnected period has been

more than four hours, a full four hour warm-

up period is necessary.

Be sure the mode selector switch is in the OFF position

and reconnect input power.

Perform functional check of the air conditioner in all

operational modes in accordance with the instructions

Set-up the air conditioner for the desired operational

mode,

Record performance of quarterly PMCS, including all

corrective act ions taken.

NOTE: If the air conditioner has been in operation under unusual conditions, the above PMCS items must

be modified as necessary to meet the further requirements due to the unusual conditions.

Section V.

TROUBLESHOOTING

4-12. USE OF TROUBLESHOOTING TABLE

Table 4-2 contains troubleshooting information useful to organizational maintenance technicians in

diagnosing and correcting malfunctions or unsatisfactory operation of the air conditioner.

a. The troubleshooting table lists the. common malfunction symptoms and unsatisfactory performance

characteristics technicians are most likely to encounter; test and inspection steps to be followed to determine

the cause; and the corrective action(s) that should be performed for each possible cause listed.

b. The technician should first find the malfunction symptom or unsatisfactory performance characteristic in

the table which most closely describes the immediate situation; then perform the test and inspections, and

corrective action steps in the order in which they are listed.

c. This manual cannot list all possible situations which may be encountered, nor can it list all test and

inspection, and corrective action steps which may be taken. If a condition is encountered which cannot be

resolved within the capabilities and experience of organizational maintenance personnel, assistance should

be requested from direct support maintenance.