EVAPORATOR FAN, MOTOR, AND HOUSING CLEAN ING, INSPECTION, TESTING, REMOVAL, ASSEMBLY, AND INSTALLATION

TM 9-4120-428-14

0050 00

UNIT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

EVAPORATOR FAN, MOTOR, AND HOUSING CLEAN ING, INSPECTION, TESTING, REMOVAL, ASSEMBLY,

AND INSTALLATION

INITIAL SETUP:

Lock Washers (18)

Tools

Resilient Mounts (2)

Insulation, Appendix F, Figure F-25 (Part B)

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Rags, Appendix E, Item 13

Adhesive Remover, Appendix E, Item 16

Adhesive, Appendix E, Item 2

Materials/Parts

Evaporator Fan Motor

Equipment Condition

Evaporator Fan Impeller

Evaporator Centrifugal Housing

Remove Condensate Drain Tubing (WP 0027 00)

Evaporator Fan Inlet Ring

Self-locking Nuts (20)

CLEANING

Wipe all dust or dirt from the fan, motor, and housing.

INSPECTION

1. Check that all parts are properly placed and in good condition.

2. Inspect the fan for damaged or bent blades and check the motor for signs of overheating. Check all

mounting hardware for tightness.

3. Disconnect the P3 motor connector plug and check for loose, damaged, or missing pins.

4. Inspect the fan's housing for damage and for missing or defective hardware.

TESTING

1. The motor is capable of operating at two speeds; therefore, there are two sets of field coils.

2. Use an ohmmeter or continuity tester and check the continuity at P3 between pins A and B, A and

C, D and E, and E and F. Continuity should exist. If continuity does not exist, allow the motor to

cool and retest. If continuity continues to not exist, replace the motor.

3. Check the continuity at P3 from pin G to pins A, B, C, D, E, and F. Continuity should not exist. If

continuity does exist, replace the motor.

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