oREFRIGERATION SYSTEM SERVICING -(BRAZING/DEBRAZING). - continued

TM 5-4120-386-14

5-12. REFRIGERATION SYSTEM SERVICING - (BRAZING/DEBRAZING) - Continued.

LOCATION/ITEM

ACTION

REMARKS

Debrazing. Debraze joints

for removal of refrigeration

system components as follows:

All refrigerant-22 must be dis-

charged from the system and the

entire system must be purged with

dry nitrogen before begiming

any debrazing operation.

( 1 ) Determine which

joints are to be

debrazed. Due to the

limited work space

inside the air

conditioner, it may be

more convenient to

remove a part of the

inter-connecting tubing

with the component

rather than debrazing

the joints on the

component itself.

(2) Before debrazing a joint

on a valve, disassemble

the valve to the extent

possible, then wrap all

but the joint with a wet

rag to act as a heat sink.

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 at brazing temperature.

5-39