BRAZING, DEBRAZING, AND CLEANING PROCEDURES

TM 9-4120-428-14

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DIRECT SUPPORT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

BRAZING, DEBRAZING, AND CLEANING PROCEDURES

INITIAL SETUP:

Materials/Parts

Tools

Brazing Alloy, WP 0000 00, Items 9 and 10

Refrigeration Unit Service Tool Kit, WP 0000 00, Item

Brazing Flux, WP 0000 00, Item 11

Abrasive Cloth, WP 0000 00, Item 12

Goggles, WP 0000 00, Item 2

Rags, WP 0000 00, Item 13

Gloves, WP 0000 00, Item 2

Equipment Condition

Discharge refrigerant system (WP 0065 00)

WARNING

The polyurethane foam used as insulation in the air conditioner will break down to form

toxic gasses if exposed to the flame of a torch or brazing temperature.

Never use a heating torch on any part that contains refrigerant. Heat will cause the

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

corrosive gas. All of the refrigerant must be discharged from the system. The entire

system must be purged with dry nitrogen before beginning any debrazing operation.

DEBRAZING

1. Be sure the work area is well ventilated and that dry nitrogen is flowing through the refrigeration system at a rate of

1 2 cfm (0.028 0.057 m3/minute). See Para 5 -11).

WARNING

The polyurethane foam, used as insulation in the air conditioner, will break down to form

toxic gases if exposed to the flame of a torch or brazing temperature.

2. Protect the insulation, wiring harnesses, and other components with the appropriate shields.

WARNING

Never use a heating torch on any part that contains refrigerant. Heat will cause the

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

corrosive gas. All of the refrigerant must be discharged from the system. The entire

system must be purged with dry nitrogen before beginning any debrazing operation.

NOTE

It may be easier to access a component by cutting or debrazing the copper lines in the

accessible areas and by removing part of the interconnecting tubing with the component.

3. When debrazing a joint on a valve, disassemble the valve to the extent possible and wrap all but the joint with a wet

cloth to act as a heat sink.

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