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TM5-4120-376-14 CHAPTER 2 OPERATING INSTRUCTIONS INTRODUCTION.   This   chapter   contains   a   functional   description   of   the   major   components   of the  air  conditioner.  It  explains  how  to  operate  the  air  conditioner. SECTION  I.  DESCRIPTION  AND  USE  OF  OPERATOR’S  CONTROLS  AND  INDICATORS 2-1.   OPERATOR’S   CONTROLS.   This   section   describes,   locates   and   illustrates   the   various controls  and  provides  the  operator  sufficient  information  to  ensure  proper  operation  of  this  air conditioner.  The  location  and  function  of  controls  and  instruments  are  illustrated  as  shown  on the  Control  Module.  Other  information  and  illustrations  are  provided  to  ensure  proper operation  of  the  air  conditioners. a.   Control   Circuit   Breaker.   The   control   circuit   breaker   is   a   safety   device   which   provides overcurrent  protection  for  the  control  circuit  of  the  unit.  The  control  circuit  breaker  is  not  a control   switch   to   be   used   for   operating   the   unit.   This   breaker   should   always   be   maintained   in the  ON  position.  If  the  breaker  trips  to  the  OFF  position,  an  electrical  defect  in  the  control circuit  is  indicated  and  corrective  action  should  be  taken.  Manually  resetting  the  circuit breaker   to   ON   restores   electrical   continuity. b.   Compressor   Circuit   Breaker.   The   compressor   circuit   breaker   is   a   safety   device   which provides   overcurrent   protection   for   the   compressor.   The   compressor   circuit   breaker   is   not   a control  switch  to  be  used  for  operating  the  unit.  This  breaker  should  always  be  kept  in  the  ON position.  If  the  breaker  trips  to  the  OFF  position,  a  defective  compressor  or  related  defective electrical  components,  or  faulty  wiring,  is  indicated.  Inadequate  input  power  voltage  will  also cause  the  circuit  breaker  to  trip.  The  unit  control  circuit  is  also  connected  to  auxiliary contacts  on  the  compressor  circuit  breaker.  When  this  circuit  breaker  trips  to  OFF,  it disconnects  the  control  circuit  allowing  the  time  delay  relay  to  reset  and  the  refrigerant  system pressures  to  equalize.  Manually  resetting  the  compressor  circuit  breaker  to  ON  restores electrical   continuity. c.   Temperature   Selector   Switch.   The   temperature   selector   switch   is   a   thermostatic   switch which  responds  to  temperature  variations  from  60°F  in  the  maximum  cooler  position  to  90°F (15.6°C  to  32.2°C)  in  maximum  warmer  position.  The  best  preliminary  adjustment  of  the temperature   seletor   is   midway   between   the   cooler   and   warmer   positions,   corresponding   to approximately  75°F  (24°C).  A  ten  minute  period  should  be  allowed  between  adjustments  of  the temperature  selector  for  the  full  effect  of  the  adjustment  to  be  realized.  Once  the  desired temperature  of  the  air  conditioner  space  is  obtained,  no  further  adjustment  is  required  for either  cooling  or  heating  modes  of  operation. 2-1

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