FLUSHING THE REFRIGERANT SYSTEM

TM 9-4120-428-14

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DIRECT SUPPORT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

FLUSHING THE REFRIGERANT SYSTEM

INITIAL SETUP:

Materials/Parts

Tools

Refrigerant R-114, WP 0000 00, Item 5

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Equipment Condition

Goggles, WP 0000 00, Item 2

Gloves, WP 0000 00, Item 2

Remove Compressor (WP 0090 00)

Power Supply, WP 0000 00, Item 6

Diaphragm Pump, WP 0000 00, Item 8

FLUSHING

CAUTION

When a hermetic motor burns out, the stator winding decomposes forming carbon, water,

and acid, which contaminate refrigerant systems. These contaminates must be thoroughly

removed from the system to prevent repeated motor failures.

Unit contains R-22, a chemical substance that harms public health and the environment

by destroying ozone in the upper atmosphere. Qualified personnel must service

equipment only.

Flush the refrigerant system with refrigerant solvent R-114. Flushing should be done

under a pressure of 8 to 12 psi (.56 to .84 kg/cm2). Procedures for flushing the system are

as follows:

1. Connect the discharge line of the pump to the tubing at point 1. Connect the recovery line to the tubing t point 2.

Leave the suction line service value (point 3) and discharge the line service valve (point 6) closed. Cap the tubing at

points 4 and 5.

2. Start the pump and flush the line for approximately 10 minutes and then turn the pump off.

3. Remove the recovery line from point 2 and cap the tubing (at point 2).

4. Connect the recovery line to the valve at point 3 and open the suction line service valve.

5. Start the pump and flush the line for approximately 10 minutes and then turn the pump off.

6. Disconnect the bypass solenoid valve plug (P8) from the receptacle (J8).

7. Energize the solenoid valve by applying 28 volts dc across pins A and B of the plug (P8).

8. Start the pump and flush the line for approximately 10 minutes and then turn the pump off.

9. Switch the pump lines so that the discharge line is connected to the suction line service valve at point 3 and the

recovery line is connected to the tubing at point 1.

10. Start the pump and flush the line for approximately 10 minutes and turn the pump off.

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