TEMPERATURE SELECTOR SWITCH S3 REPLACEMENT, INSPECTION, AND TESTING

TM 9-4120-428-14

0030 00

UNIT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

TEMPERATURE SELECTOR SWITCH S3 REPLACEMENT, INSPECTION, AND TESTING

INITIAL SETUP:

Tools

Materials/Parts

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Temperature Selector

Self-Locking Nuts (4)

Self-Locking Screws (3)

Equipment Condition

Remove the control module (WP 0029 00)

REMOVAL

1. Remove four machine screws (1) and pull control cover (2) off.

2. Loosen setscrew (3) in the knob (4). Remove knob.

3. Remove three machine screws (5) from spacer posts (6) and slip the mounting frame (7) off.

4. Tag and disconnect wires from the thermostatic switch (8) from the mounting frame (7).

INSPECTION

Check the thermostatic switch (8) for kinked or damaged capillary line or bulb and loose, broken, or missing terminals.

TESTING

1. Place the sensing bulb (12) in a container of warm water, 75-85 degrees F (25-30 degrees C) and set multimeter to

measure resistance on lowest scale. Place multimeter leads on terminals 1 and 3 of the thermostat (blue and red). Turn

the knob to the extreme cooler position. There should be no indication of continuity on multimeter. Turn the knob to the

extreme warmer position. Continuity should be indicated on the multime ter.

0030 00-1