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Figure 36. Dual Pressure Switch, Adjustment, Removal And Replacement. - TM-5-4120-259-15_72
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Figure   37.   Refrigerant   System   Discharging,   Evacuating   And   Charging   Arrangement..
TM 5-4120-259-15 figure 13 fig. 30 figure 37 fig. 37 fig. 36 figure 13 (1) ( 2 ) 95.  System  Evacuation To minimize the time needed for evacuation and  for  obtaining  a  completely  dry  system, use  the  double  evacuation  procedure  which follows.  (See  figure  37  which  shows  connec- tions  and  procedure.) a. With a vacuum pump, reduce the system to   an   absolute   pressure   of   approximately 54 10,000 microns, 10 millimeters. The stop evacu- ation and break  vacuum with oil-pumped dry nitirogen.  This  will  cause  any  condensed  vapor to  flash  back  into  its  original  state  of  vapor in  which  it  can  be  removed  by  the  pump.The dry  nitrogen  serves  as  a  carrier  for  the  water vapor. b. The above procedure should be repeated several   times   to   assure   a   completely   dry system. 96. Replacing Tubing, Fittings or Refrigerant  Components a.  General.  A   careful   ana!ysis   of   any trouble  should  first  be  mde  to  determine  if replacement  is  necessary.  The  cause  of  failure must   be   determined    before  replacement  is made. b.  Unbrazing  Joints (1) Release system charge to the atmos- phere or refrigerant  cylinder through the  System charging   valve, figure 30. (2)  Connect  a  cylinder  of  oil  pumped dry  nitrogen  to  the  system  charging valve,  figures  30  and  37,  and,  using a  nitrogen  regulating  valve,  charge the system with just enough nitrogen to  insure  a  constant  flow  of  nitrogen at all times when the system is open and while   brazing   or unbrazing joints.  One  to  two  psig  is  sufficient. c.  Cutting  Copper  Tubing. Use  a  sharp  wheel  cutter,  or  hack- saw  of  32  teeth  per  inch.  Avoid  any burns  or  malforming  of  the  tube  at the cut. Cut   tubing   square   and   remove   all burns from inside and outside with a sharp  fine  file.  Hold  tubing  so  filings will   drop   away   from   tube   opening. Caution: Care must be taken to pre- vent  filings  or  cuttings  from  entering the tube. Particles which enter the tube must be cleaned out before com- pleting connections. Failure to do this may result in damage to the system through  oil  gumming  and  sludging, chemical  reaction,  or  direct  scoring  of the cylinder walls and pistons.

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