DIRECT SUPPORT TROUBLESHOOTING PROCEDURES

TM 9-4120-430-14

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DIRECT SUPPORT TROUBLESHOOTING PROCEDURES

AIR CONDITIONER, COMPACT, HORIZONTAL

THIS WORK PACKAGE COVERS:

Compressor Will Not Start, Compressor Starts But Stops At Once, Insufficient Cooling, Compressor Runs But

Does Not Cool, Compressor Excessively Noisy, Suction Pressure Too Low or Too High, Low Heat or No Heat

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanics (Item 1, Table 2, WP 0067 00)

Tool Kit, Service, Refrigeration Unit (Item 2, WP 0067 00)

Recovery and Recycle Unit, Refrigerant (Item 5, WP 0067 00)

Mask, Air Filtering (Item 29, Table 1, WP 0069 00)

Test Equipment

Multimeter

Electronic refrigerant gas leak detector

References

Schematic Diagrams WP 0038 00

Personnel Required

One

Equipment Condition

Mode selector switch in OFF position

Main power source is disconnected

Top cover removed (WP 0018 00)

WARNING

Ensure power source is disconnected.

FAULT PROCEDURE 1. COMPRESSOR WILL NOT START.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

COMPRESSOR WILL NOT START

Step 1.

Make continuity check of control circuit and components. See WP 0038 00 for control circuit

schematic diagram.

a. Check for 24 volts at transformer (TR).

b. Check for power to K1 relay.

c. For S9150-18KH-1 unit, check continuity of B1 starter kit components (C3, C4, R1).

d. Repair loose or broken connections. Replace bad components. (Refer to WP 0026 00

Step 2.

If fans do not operate, make continuity check of circuit breaker. (Refer to WP 0027 00).

Replace bad circuit breaker. (Refer to WP 0027 00.)

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