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TM5-4120-384-14
5 - 1 3 . BRAZING/DEBRAZING PROCEDURES.
Supplies:
Brazing  alloy  (silver)  (items  9  and  10,
Nitrogen  cylinder  (item  8,  Appendix  E)
Brazing  flux  (item  11,  Appendix  E)
Abrasive  cloth  (item  12,  Appendix  E)
Rags  (item  13,  Appendix  E)
General.
All  tubing  in  the  refrigeration  system  is  seamless
a.
copper  with  a  bright  internal  finish  that  permits  thorough  cleaning
Rigid
and  prevents  entrapment  of  moisture  or  other  impurities.
grade  copper  is  used  for  straight  sections  and  soft  grade  for
sections  that  must  be  bent.
All  interconnecting  fittings,  such  as
The  bodies  of  all  valves  and
elbows,  teess  etc.,  are  also  copper.
All  joints,  except
all  connectors  on  other  components  are  brass.
t h o s e  p r o v i d e d  w i t h  f l a r e  f i t t i n g s  are  made  by  brazing  in
accordance  with  MIL-B-7883,  except  that  radiographic  examination  is
not  required.
Filler  Alloy.
Grade IV or VI brazing alloy and Type B flux,
b.
as  specified  in  MIL-B-7883,  must  be  used  for  all  copper  to  brass
Grade  III  brazing  alloy  may  be  substituted  for  Grade  IV  or
joints.
VI  for  copper  to  copper  joints;  flux  is  not  required  for  copper  to
copper  joints.
Debrazing.
Debraze  joints
for
removal
of
refrigeration
c.
system  components
as  follows:
All  Refrigerant - 22 must be discharged from the
system  and  the  entire  system  must  be  purged  with  dry
nitrogen  before  beginning  any  debrazing  operation.
(1)  Determine  which  joints  are  to  be  debrazed.  Due  to
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  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  cloth  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  or  brazing
temperature.
5-28

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