EVAPORATOR FAN MOTOR UNIT MAINTENANCE

TM 9-4120-425-14&P

EVAPORATOR FAN MOTOR UNIT MAINTENANCE

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THIS WORK PACKAGE COVERS:

Test

INITIAL SETUP:

Maintenance Level

Unit Support

Tools and Special Tools

Tool Kit, General Mechanics (Item 1, Table 2, WP 0118-00)

References

Schematic Diagram, WP 0122-00

Equipment Condition

Main power source is disconnected, shut down and cool.

Evaporator air intake louver removed (WP 0020-00).

Junction box assembly partially removed from unit (WP 0035-00).

WARNING

Disconnect air conditioner power.

TEST

Carefully slide out junction box assembly from unit to access terminal board TB2 for testing motor B2. Refer to WP

0035-00 and Schematic diagram WP 0122-00.

Using an ohmmeter set on lowest ohms scale, check continuity between black lead and red lead (TB2 terminals 10

& 11) of motor B2. Continuity should be indicated between these leads.

Test continuity between black lead and green lead (ground) of motor B2 (TB2 terminals 10 and ground). Continuity

should NOT be indicated between these leads.

Rotate motor shaft very slowly and check for smooth and quiet operation of shaft. Shaft should rotate smoothly and

should not make grinding or binding noises.

If evaporator motor fails any of the above tests, motor must be replaced. Report motor failure to Direct Support

Maintenance shop for replacement.

END OF TASK

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