TIME DELAY RELAY (K1) TESTING, INSPECTION, REMOVAL, REPLACEMENT, AND INSTALLATION

TM 9-4120-428-14

0038 00

UNIT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

TIME DELAY RELAY (K1) TESTING, INSPECTION, REMOVAL, REPLACEMENT, AND INSTALLATION

INITIAL SETUP:

Tools

Materials/Parts

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Time delay relay

self-locking nuts (2)

Power Supply, WP 0000 00, Item 6

Equipment Condition

Remove Junction Box (WP 0036 00)

INSULATION (REF)

WIRE (REF)

INPUT

RELAY DIAGRAM

TESTING

1. Connect the multimeter to terminal A1 and A2 of the relay K3.

2. Apply +28VDC to terminal 6 of TB1 and 28VDC to terminal X2 of K3.

3. Multimeter must show continuity across terminals A1 and A2 within 30 +/- 3 seconds after applying the 28 VDC.

4. Remove the 28 VDC. The multimeter must show that the contacts are open.

INSPECTION

Check relay for general condition and loose, broken, or missing terminals.

REMOVAL

1. Tag and disconnect all wires to the relay. (WP 0038 00).

2. Remove two screws (1), self-locking nuts (2), and flat washers (3).

3. Pull the relay (4) from the junction box.

REPLACEMENT

Replace individual relays if defective.

INSTALLATION

0038 00-1