CONDENSER FAN, MOTOR, AND HOUSING INSPECTION, TESTING, REMOVAL, REPLACEMENT, AND INSTALLATION

TM 9-4120-428-14

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UNIT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

CONDENSER FAN, MOTOR, AND HOUSING INSPECTION, TESTING, REMOVAL, REPLACEMENT, AND

INSTALLATION

INITIAL SETUP:

Condenser Fan Inlet Ring

Tools

Lock Washers (2)

Tie Down Straps

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Equipment Condition

Materials/Parts

Remove Louver and Cable Assembly (WP 0021 00)

Remove Compressor Start Relay (WP 0044 00)

Condenser Fan Motor

Condenser Fan Impeller

Condenser Fan Housing

INSPECTION

1. Check motor rational freedom by spinning the fan. If there is any stiffness or binding, notify supervisor.

2. Check the motor bearings for shaft endplay. If there is excessive endplay, notify supervisor.

3. Check the impeller fan for dents and bent or loose fan blades and ensure the hub is securely attached. Replace if

damaged.

4. Check the fan inlet ring for dents or any distortion that would cause interference with the impeller fan. Replace if

damaged.

TESTING

1. Use a continuity tester to check the continuity of field coils between motor connector P5 pins A and B and between

pins A and C. Continuity should exist.

2. Check the continuity from Pin G to Pins A, B, C, D, and E. Continuity should not exist.

3. Check the continuity of the thermal protectors between pins D and E. If continuity does not exist, allow the motor to

cool and then recheck. If continuity continues to cease to exist, replace the motor.

NOTE

If the above inspections and tests are satisfactory but the motor will not operate properly,

notify Direct Support Maintenance.

REMOVAL

1. Remove four cap screws (Item 1) and washers (2) from the top of the motor mounting plate (3).

2. Cut all plastic tie-down straps to free the motor cable.

3. Unscrew the P4, P5, P6, P8, and P9 connectors and push them aside.

4. Loosen two setscrews (4) on the motor shaft extension (5) at the end of the motor. Slide the shaft extension (5) and

the fan (6) from the motor shaft.

5. Carefully lift the motor (7) and the mounting plate (3) up and out of the unit.

6. Remove the motor shaft extension (5) from the fan (6) by loosening the setscrew (8) on the fan hub.

7. If the motor needs to be replaced, remove four cap screws (9), lock washers (10), eight flat washers (11), mounting

plate (3), four bushings (12), and grommets (13).

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