Quantcast Figure 36. Dual Pressure Switch, Adjustment, Removal And Replacement. - TM-5-4120-259-15_72

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Figure 36. Dual Pressure Switch, Adjustment, Removal And Replacement. - TM-5-4120-259-15_71
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TM-5-4120-259-15 Air Conditioner Horizontal Compact 9 000 BTU Trane Models Manual
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Replacing Tubing, Fittings or Refrigerant  Components
TM  5-4120-259-15 CHAPTER 6 REPAIR  INSTRUCTIONS Section  I.  REFRIGERANT  SYSTEM 92. General Refer   to   refrigerant   flow   diagram,   figure 27.  Liquid  refrigerant  which  has  been  admit- ted  to  the  evaporator  absorbs  heat  from  the air   drawn   over   and   around   the   evaporator coil. This cooled air is blown out into the area being  conditioned.  Upon  absorbing  heat,  the refrigerant  in  the  evaporator  boils  to  a  gas which  is  drawn  to  the  compressor.  The  com- pressor  raises  the  pressure  and  temperature  of the gas and discharges to the condenser where the gas condenses to liquid. Heat from the gas is  absorbed  by  the  condenser  coil  surfaces  and is  carried  away  by  air  that  is  drawn  over  and round  the  condenser  coil.  The  liquid  refriger- ant  is  accumulated  in  a  receiver  and  is  re- leased to the evaporator by the solenoid valve when the valve is actuated by the thermostat. The thermal expansion valve senses the heat of  the  refrigerant  leaving  the  evaporator,  and controls  the  flow  of  liquid  refrigerant  to  the evaporator  to  prevent  flooding.  The  hot  gas bypass   creates   a   refrigerant   circuit   bypass which   permits   la   continual   operation   of   the compressor. 93.  Testing  for  Refrigerant  Leaks a.  Using   Leak   Detector.   Proceed   as   fol- lows: (1) (2) (3) Make   sure   that   the   testing   unit   is working   correctly. Hold  the  exploring  hose  close  to  the joint   being   tested,   to   prevent   dilu- tion  of  the  sample  by  stray  air  cur- rents. Move   the   exploring   tube   slowly around   each   joint.   Allow   time   for detector to react to very small leaks. (4)  Follow  a  definite  order  in  leak  test- ing  so  that  no  joints  will  be  missed. Use  soap  suds  as  necessary  to  find the  exact  point  at  which  a  leak  is occuring. Note.   Do  not  use  a  leak  detector  in  an atmosphere   known   to   be   heavy   with   B frigerant   m   this   condition   will   tend   to foul   it. b.  Using  Soap  Suds.  A  soap  suds  test  is preferred  in  an  area  which  is  contaminated with  refrigerant.  Such  a  tsst  will  also  permit a  more  exacting  location  of  small  leaks.  To prepare suds for testing, use a soap and water solution  which  can  be  worked  into  a  lather. Glycerine added to the solution will cause the lather  to  remain  wet  longer.  Where  applying soap suds, paint the lather on the joint all the way   around, and   then   examine   the   joint thoroughly  for  bubbles.  Use  a  mirror  to  ob- serve any part of the joint not directly visible. It  will  sometimes  take  a  full  minute  or  more for  bubbles  to  appear  at  a  small  leak.  Ques- tionable  spots  should  be  covered  with  lather and  examined  again. 94.  Discharging  the  Refrigerant  System a. General.  Prior  to  opening  the  refrigerant system  for  maintenance,  the  system  must  be discharged. The refrigerant may be discharged into  a  suitable  service  cylinder  for  reuse  or discharged to the atmosphere. Warning: Refrigerant-22 is contained in the refrigerant system under high pressure. Ex- treme care must be exercised to prevent re- frigerant  from  coming  in  contact  with  ex- posed skin and eyes. Provide adequate ventila- tion when discharging the system in a confined area. 53

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