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TM5-4120-377-14 (4) Carefully  feel lower  part  of  compressor. l If  air  conditioner  has  been  connected  to  power  supply  for  at  least  four  hours,  compressor  should feel warm  (100  to  120°F).  If  not  warm,  test  crankcase  heater  for  continuity. l If  air  conditioner  has  not  been  connected  to  power  supply  for  at  least  four  hours,  compressor temperature  should  be  the  same  as  surrounding  air  temperature. (5)  Using  multimeter,  test  crankcase  heater  and  thermostat  circuit  at  J4  connector: l Using multimeter, test resistance from pin F to pin G. Resistance should be 950 to 1430 ohms. Lower reading  indicates  short,  and  infinite  reading  indicates  an  open. (6)  Using  multimeter,  test  crankcase  heater  and  thermostat  at  junction  box: Remove  compressor  junction  box  cover. Open  connection  between  thermostat  lead  and  heater  lead. Check  heater  continuity  between  open  connection  and  J4-F.  If  open,  heater  should  be  replaced. Check  thermostat  continuity  between  open  connection  and  J4-G.  If  open,  thermostat  should  be replaced. (7)  Using  multimeter,  test  compressor  motor  windings. l l l l l Check continuity between pins A, B, and C and the compressor body. No continuity should exist. If continuity  exists,  the  compressor  is  bad. Test 3 phase windings at J4: A to B B to C A to C All  resistances  should  be  above  zero  and  less  than  2  ohms. Test  resistance  between  pin  D  and  pin  E.  Resistance  should  be  zero  indicating  motor  protector  is closed. Compressor  containing  shorted,  open  or  grounded  winding  or  open  motor  protector,  should  be replaced. If   compressor   windings   are   bad,   check   for   compressor   burn   out   prior   to   installing   a   new compressor.  (See  instructions  in  compressor  removal.) 5-36

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