TRANSFORMER T1 INSPECTION AND REPLACEMENT

TM 9-4120-428-14

0049 00

UNIT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

TRANSFORMER T1 INSPECTION AND REPLACEMENT

INITIAL SETUP:

Equipment Condition

Tools

Remove Top Front Panel (WP 0019 00)

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Remove Junction Box (WP 0036 00)

Materials/Parts

Transformer

Insulation Sleeving

Lock Washers (4)

TRANSFORMER

DIAGRAM

INSPECTION

1. Remove four screws (1), lock washers (2), and flat washers (3) and pull the transformer from the unit.

2. (On three-phase units only). Tag and disconnect leads from terminals 2 and 7. Check for continuity across the

primary winding pin (pin 2 to pin 5) and across the secondary winding pin (pin 7 to pin 8). If either winding is open,

replace the transformer. (See WP 0 049 00).

3. Check for shorts between terminals of each winding and transformer case and between primary terminals and

secondary terminals using a multimeter on high ohms setting. If a short is indicated, replace the transformer.

4. Tag and connect all wire leads and remove tags. (WP 0028 00).

5. Attach the transformer (4) to the unit with four screws (1), lock washers (2), and flat washers (3).

REPLACEMENT

1. Remove four screws (1), lock washers (2), and flat washers (3) and pull the transformer (4) from the unit.

2. Tag and disconnect all wire leads. (WP 0028 00) and replace the transformer.

3. Connect all wire leads to the new transformer and remove tags. (WP 0028 00).

4. Attach the transformer (4) to the unit with four screws (1), lock washers (2), and flat washers (3).

NOTE

FOLLOW-ON MAINTENANCE:

Install Junction Box (WP 0036 00)

Install Top Front Panel (WP 0019 00)

END OF WORK PACKAGE

0049 00-1