Quantcast adjustment - TM-5-4120-375-14_221

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TESTING - TM-5-4120-375-14_220
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TM-5-4120-375-14 Air Conditioner Horizontal Compact 18 000 BTU 208 Volt 3 Phase 50/60 Hertz NSN
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ADJUSTMENT - TM-5-4120-375-14_222
5-53 TM5-4120-375-14 THERMAL EXPANSION VALVE (CONT.) LOCATION/ITEM ACTION REMARKS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4. Expansion   Valve a.  A  refrigerant   gas   is   said   to   be   superheated   when its   temperature   is   higher   than   the   evaporating   tem- perature   corresponding   to   its   pressure   at   saturation When  a  thermal  expansion  valve  is  set  for  optimum superheat   (in   this   case   6   degrees   F  or  3.3  d e g r e es C   above   the   evaporating   temperature   of   the   refri- gerant   at   a   given   pressure)   the   evaporator   coil operates   at   maximum   efficiency. That   is,   the refrigerant   gas   does   not   become   warm   before   reaching the   end   of   the   coil,   which   would   reduce   the   coils cooling   capacity,   and   the   refrigerant   does   not remain   in   the   liquid   state   after   passing   completely through   the   coil,   which   could   result   in   severe damage   to   the   compressor.   The   superheat   setting of  a  thermal  expansion  valve  can  be  adjusted  by varying   the   setting   of   a   compression   spring   (7) in   the   power   assembly   of   the   valve. This   spring tends   to   hold   the   valve   closed   against   the   pressure in   the   sensing   bulb   and   capillary   tube;   therefore, the   greater   the   spring   pressure,   the   higher   the superheat. Check   superheat   and   adjust   if necessary,   in   accordance   with   the   following procedure:

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