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CHAPTER 6 REPAIR   INSTRUCTIONS - TM-5-4120-361-14_109
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TM-5-4120-361-14 Air Conditioner Vertical Compact 18 000 BTU/HR 208 Volts 3 Phase 50/60 Hz (Model 18K 208 3 60) Manual
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Figure 6-1. Discharging and purging refrigerant system
TM  5-4120-361-14 Table   6-1.    Normal Operating  Pressures. Outdoor Ambient  Temperature 50” F(10”C) 75 °C(24”C) 1OO”F(38”C) 120 °F(490C) At 90” F(32”C)  DB return  air to unit Suction 58-65 psi 58-70 psi 60-75 psi 75-90 psi Pressure (400-450  kPa) (400-485 kPa) (255-295 kPa) (5 15-620  kPa) Discharge 125-160 psi 175-210 psi 255-295  psi 370-4 i O psi Pressure (860-1 100kPa) ( 1200-1450kPa) ( 1750-2025kPa) (2550-2825kPa) At 80 °F(270C) DB return air to unit Suction 58-65 psi 58-70 psi 60-75 psi 65-75 psi Pressure (400-450  kPa) (400-485 kPa) (415 -515 kPa) (450-5 15 kPa) Discharge 120-155 psi 170-205 psi (250-290 psi 370-410  psi Pressure (8~5-]070kpa) (1170-1415kPa) ( 1725-2000kPa) (~550.2825kpa) 6-3.  Servicing  Refrigerant  System. 1. Caution should be exercised with flu- orocarbon  refrigerant  gas  (freons)  as  they can  displace  oxygen  and  thereby  cause  suf- focation. 2.  Personnel with a history or other evi- dence of cardiac rhythm abnormalities should be made aware of the potential for aggravation  of  existing  cardiac  rhythm abnormalities or the induction of arryth- mias, as a result of exposure to fluorocar- bon  refrigerant  gases  (freons).  Such  indi- viduals should be evaluated by local medical authorities before working in environments  where  potential  freon  expo- sure may occur. a.  General. When the air conditioner must undergo maintenance that requires opening the system, the system must be discharged with a recovery/recycling unit prior to maintenance, then leak tested and purged, a new dehydrator installed,  and  the  system  charged  after  maintenance.  Basic procedures involved in servicing the refrigerant system are as  follows: b. Discharging  System. Refer to figure 6-1 for instructions  on  discharging  the  refrigerant  system. c. Testing  System  for  Leaks. Refer to paragraph 5-6 and  leak  test  the  refrigeration  system. d. Purging  the  Refrigerant  System.  Refer  to  figure 6-1  and  purge  the  refrigerant  system. e. Charging the System. Refer to figure 6-2 for instructions  on  charging  the  system  with  refrigerant. 6-4.  Repairing  Refrigerant  Leaks. a. Locate leak (para 5-6). b. Discharge  system  (figure  6-1  ).  repair  leak.  and recharge  system  (figure  6-2). NOTE If soldering is necessary on any part of the sys- tem.  a  constant  purge  of  dry  nitrogen  must  be fed  through  the  system  being  soldered  to  prevent scale  formation  within  the  system. 6-5.   Decontamination. a. General. The compressor is a hermetically sealed unit and cannot be 6-2 Change 4

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