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TM5-4120-376-14 5-22.   COMPRESSOR,   ACCUMULATOR   AND   RELATED   PARTS/Replace   (Cont) LOCATION/ITEM Test: 1.  Remove  the  filter-drier  (dehydrator)  in  accordance  with  paragraph  5-20,  page  5-46  and blow  down  each  leg  of  the  refrigeration  system. To   do   this,   connect   a   cylinder   of   dry   nitrogen (Table   E-1,   Item   8)   to   each   filter-drier   connection,   in   turn,   and   open   the   cylinder   shutoff   valve for  at  least  30  seconds  at  50  psig  (3.5  kg  cm2)   pressure. 2.   Connect   the   two   filter-drier   fittings   with   a   jumper   locally   manufactured   from   refrigerant tubing   and   fittings,   and   install   a   pump,   reservoir   and   filter   in   place   of   the   compressor. 3.  Disassemble  expansion  valve  and  quench  valve  and  temporarily  remove  the  valve  cages. Re-install   shell   of   power   assembly,   using   a   gasket   between   power   assembly   and   body   to   prevent leakage.  Tag  and  retain  valve  cages  for  use  at  reassembly. 4.  Disassemble  solenoid  valve  in  accordance  with  paragraph  5-19,  page  5-36. 5.  Fill  reservoir  with  fluorocarbon  refrigerant,  (Table  E-1,  Item  10)  and  start  the  pump. Continue   filling   the   reservoir   with   refrigerant,   until   it   begins   to   pour   out   of   the   return   line. Continue   flushing   for   at   least   15   minutes. 6.  Reverse  the  pump  connections,  replace  the  filter  with  a  new  filtering  medium,  and  back- flush   the   system   for   an   additional   15   minutes. 7.   Remove   the   pump,   reservoir,   filter   and   filter-drier   jumper.   Place   an   empty   container below  the  compressor  connection,  and  connect  a  cylinder  of  dry  nitrogen  (Table  E-1,  Item  8)  to each  filter-drier  connection  in  turn.  Blow  down  each  leg  of  the  system  at  50  psig  (3.5  kg/cm  2, for  at  least  30  seconds. 8.  Disassemble  both  expansion  valves  and  re-install  the  valve  cages.  Install  new  gaskets,  and assemble   the   valves,   making   sure   that   projections   in   valve   cages   fit   in   notches   in   valve   bodies. 9.  Disconnect  the  dry  nitrogen  cylinder,  and  immediately  install  a  new  filter-drier,  making sure  that  the  direction  of  flow  arrow  points  up.  Cap  or  plug  compressor  connections  if  com- pressor  is  not  to  be  installed  immediately. Installation: WARNING Purge  system  with  dry  nitrogen  prior  to  soldering.  Refrigerant  heated  to 1200°F   (649°C)   creates   phosegene   gas. 5-66

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