Evacuating Refrigerant System

TM 5-4120-393-14

5-13. Evacuating Refrigerant System

This task covers:

a. Service

Initial setup.

Tools:

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

Pump, vacuum NSN 4310-00-289-5962

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.

General Safety Instructions:

WARNING

Death or serious injury may result if personnel fail to observe safety precautions.

Use great care to avoid contact with liquid refrigerant or refrigerant gas being

discharged under pressure. Sudden and irreversible tissue damage can result

from freezing. Wear thermal protective gloves and a face protector or goggles in

any situation where skin-eye-contact is possible.

Prevent contact of refrigerant gas with flame or hot surfaces. Heat causes the

refrigerant to break down and form carbonyl chloride (phosgene), a highly

poisonous and corrosive gas.

CAUTION

Do not evacuate a leaking system. The vacuum created can cause air, moisture,

and dirt to enter the system.

SERVICE

NOTE

The refrigeration system must be evacuated to remove all moisture before it is

charged with refrigerant-22.

Check that system was leak tested and has NO LEAKS.

If the compressor was replaced as a result of a burn out, check that compressor

burn out procedures were followed. (See para 5-28).

Check that new filter-drier was installed. If not, install one. See para 5-16.

Check that both service valves and charging manifold valves are closed.

Attach hose assemblies to service valves and charging manifold valves.

Attach center hose assembly to vacuum pump.

5-27