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Page Title: BRAZING/DEBRAZING PROCEDURES CONT.
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TM5-4120-387-14 (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  interconnecting  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. Polyurethane foam used as insulation in air conditioner will break down to form toxic gases if exposed to flame of a torch at brazing temperature. (3) Protect insulation, wiring harnesses,    cabinet,  and  other  surrounding components  with  appropriate  shields. (4) Be sure the work area is well ventilated and that dry nitrogen is flowing through the refrigeration system at a rate of less than 1 - 2 cfm (0.028-0.057  m3/minute). (5) Apply sufficient heat uniformly around the joint to quickly melt the filler  alloy. If heat is applied slowly, or only on one side, the entire compo- nent or length of tubing will be heated and filler alloy in adjacent joints may also be melted. Remove heat as soon as the joint separates. d. Cleaning debrazed joints. All filler alloy must be cleaned from debrazed joints  before  reassembly. Heat each piece of the joint until the filler alloy is melted and then wipe it away with a damp cloth. Be sure no filler alloy or other debris are left inside any tubing, fitting, or  component. Reassembly. If tubing sections or fittings were removed with a component, debraze them from the component, clean the joints,   and braze them to the new component  before  reinstallation. f. Brazing. Braze joints within the air conditioner as follows: (1) Position the component to be installed. (2) To prepare a joint on a valve for brazing, disassemble the valve to the extent possible. Then wrap all but the joint with a wet rag to act as a heat sink. (3) Protect insulation, wiring harnesses,   and  surrounding  components  with appropriate  shields. (4) Be sure the work area is well ventilated and that dry nitrogen is flowing through the refrigeration system at a rate of less than 1 - 2 cfm (0.028-0.057  m3/minute). 5-12

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