Expansion Valve (Primary) - TM-5-4120-393-140249

TM 5-4120-393-14

5-19. Expansion Valve (Primary)

This task covers:

a. Inspection

c. Removal

b. Adjustment

d. Installation

Initial setup.

Tools:

Tool kit, service, refrigeration unit NSN 5180-00-596-1474

Personnel: 1

Equipment condition:

1. Turn unit power off at power source. If there is a chance that it will be turned on, also disconnect power

cable to air conditioner.

2. Remove top panel. See para 4-25.

3. Remove conditioned air filters. See para 4-30.

4. Remove right conditioned air inlet grille. See para 4-22.

General Safety Instructions:

WARNING

Disconnect input power to the air conditioner before performing any internal

maintenance. Voltages used can KILL. Shutting the unit off at the control panel

does not disconnect unit power.

INSPECTION

Inspect for evidence of leaks, kinked, or otherwise damaged capillary line, and loose or missing mounting hardware.

Check thermal bulb to see that it is securely clamped to the suction line.

If a leak is suspected or indicated, test per paragraph 5-12.

ADJUSTMENT

NOTE

The expansion valve as supplied with the unit is preset at the factory. This valve

should not be adjusted unnecessarily.

Perform a refrigerant check on unit in accordance with para 5-15. Leave gages or service manifold attached.

Remove the suction line insulation from the area of the sensing bulb (3). Observe location and position of bulb for

reinstallation.

CAUTION

Use care to not damage or kink the capillary line.

5-43