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TM 10-4130-239-14 5-5. REFRIGERATION SYSTEM SERVICE - BRAZING/DEBRAZING  (CONT) 3. protect insulation, wiring harness, sheet metal and other surrounding  components  with  proper  shields. 4. Be sure to do the work in a well ventilated area, and have dry nitrogen flowing through the refrigerant system (see paragraph 5-4) . 5. Apply enough heat uniformly around the joint to melt the filler alloy quickly. If heat is applied slowly, or only on one side, the, entire component or length of tubing will be heated and filler allow in adjacent joints may also be melted or weakened. Remove heat as soon as the joint separates. 1. Clean the mating surfaces and adjacent areas of all parts to be joined, remove all oil, grease, paint, dirt, scale, artificial oxide films, or any other foreign substances. Old filler alloy must be cleaned from debrazed joints before reassembly as best as possible. Heat each piece of the joint until the filler alloy is melted and then wipe it away with a dry rag. Use  abrasive  cloth and tubing wire brushes to clean the outside and inside joints respectively. Be sure no filler alloy or other debris is left inside any tubing, fitting or component. 2. Remove burrs to permit proper fitting of parts and flow of filler material. Unless otherwise specified, the clearance shall not exceed 0.006 inch (.15 mm). NOTE Grade IV or VI brazing alloy and Type B flux, as specified in MIL-B-7883, must be used for copper to copper joints and all copper to joints. Grade III brazing alloy may be substituted for Grade IV or VI for copper copper joints. 3. Use the following as a guide for brazing: all brass to a. To prepare a joint on a valve for brazing, disassemble the valve as completely as possible. Then wrap all but the joint with a wet rag for a heat sink. Place  tubing  and/or  components in water chiller in assembled position. b. Ensure that the unit is being purged with nitrogen per paragraph 5-4. 5-10

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