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TM5-4120-377-14 t.  Run  the  air  conditioner  in  COOL  mode  (with  TEMPerature  control  thermostat  in  full  DECREASE  position) for 15 minutes. Do not skip the next step. u.  After  15  minutes,  observe  the  sight  glass  on  back  of  condenser  section. l Green  center   means   the   refrigerant   moisture   content   is   acceptable. l Yellow  center  means  there  is  too  much  moisture  in  the  system.  It  must  be  discharged,  evacuated,  and charged  again. l Milky  white  or  bubbly  liquid  means  the  system  has  a  low  charge. l Clear   bubble-free   liquid  around  the  center  means  the  system  is  fuIly  charged. v.  If  charge  is  low,  add  gas  refrigerant. (1)  Be  sure  that  drum  is  switched  to   gas  position.   Open   the   drum   valve   and   the   air   conditioner   low pressure  service  valve. (2)  Continue  to  charge  until  sight  glass  is  clear  and  bubble-free. (3)  Close  the  air  conditioner  low  pressure  service  valve  and  refrigerant  drum  valve. w. Check air conditioner for proper cooling. There should be at least a 15° F temperature difference between evaporator  discharge  air  and  the  inlet  air.  Turn  the  mode  selector  switch  to  OFF. x.  Assure  that  the  high  and  low  pressure  air  conditioner  service  valves  are  closed  and  remove  the  charging manifold  hoses  from  the  air  conditioner  service  valves. y.  Install  service  valve  protective  caps. Figure   5-7.   Service  Valve  Caps and  Cover z.  Using  screwdriver,  secure  service  valve  access  cover  with  four  screws  and  flat  washers. 5-17

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