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Page Title: PRESSURE REGULATING VALVE
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TM5-4120-377-14 5-24. PRESSURE REGULATING VALVE a.    Adjustment/Test (1)  Valves  are  factory  set  to  start  opening  when  suction  pressure  decreases  to  58  psig.  Do  not  adjust unless  you  are  sure  adjustment  is  necessary. (2)  Perform  a  refrigeration  pressure  check  on  unit  in  accordance  with  paragraph  5-12.  Leave  the  gages or  service  manifold  attached. (3)  Set  TEMPerature  control  thermostat  knob  fully  INCREASE  (clockwise),  start  air  conditioner  in  COOL mode,  and  observe  pressure  gages.  Suction  pressure  should  drop  to  58  ±  2  psi  (4.0  ±  0.14  kg/cm2)  shortly after  compressor  starts,  and  then  remain  constant. (4)  If  unit  fails  above  test,  the  pressure  regulating  valve  must  be  adjusted. (a)  Turn  unit  OFF. Figure  5-24.  Pressure  Regulating  Valve  Access (b)  Using  screwdriver,  loosen  two  captive  panel  fastener  screws  in  lower  front  panel. (c)  Tilt  top  of  lower  front  panel  out  and  lift  panel  up  to  remove. (d)  Using  screwdriver,  loosen  four  captive  panel  fastener  screws  in  junction  box  mounting  flange. Take  care  that  wire  harnesses,  capillary  line,  and  circuit  breaker  reset  linkage  are  not damaged. 5-50

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