EVACUATING THE REFRIGERATION SYSTEM

TM 9-4120-428-14

0070 00

DIRECT SUPPORT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

EVACUATING THE REFRIGERATION SYSTEM

INITIAL SETUP:

Tools

Materials/Parts

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Nitrogen, WP 0000 00, Item 8

Refrigerant R-22, WP 0000 00, Item 4

Vacuum Pump, WP 0000 00, Item 3

Equipment Condition

Install service manifold (WP 0064 00)

VAC

VACUUM VALVE

VACUUM PUMP

HIGH

PRESSURE

GAUGE VALVE

REF

CHARGE

VALVE

RED 1/4 IN.

PRESSURE GAUGE

HOSE (HIGH)

LOW

HIGH

COMPOUND

PRESSURE

GAUGE VALVE

CHARGING

LOW

VALVE

PRESSURE

YELLOW 3/8 IN.

VACUUM HOSE (VAC)

CHARGING VALVE

YELLOW 1/4 IN.

CHARGE HOSE (REF)

BLUE 1/4 IN.

COMPOUND GAUGE

HOSE (LOW)

EVACUATION

1. Check that the new dehydrator was installed. If not, install one. (WP 0075 00).

2. Check that the service manifold charge valve is closed.

3. Check that the unit HIGH and LOW pressure charging valves are open.

4. Connect the 3/8-inch hose to the vacuum pump.

5. Start the vacuum pump.

6. Open the service manifold high pressure gauge, compound gauge, and vacuum valves.

7. Run the vacuum pump until at least 29 inches of mercury is measured on the compound gauge.

0070 00-1