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Leak  Checking - TM-5-4120-375-14_182
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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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EVACUATING THE SYSTEM (cont.)
TM5-4120-375-14 5-17.  EVACUATING   THE   SYSTEM. Before   the   system   is   charged   with   refrigerant,   it   must   be   completely evacuated   to   exhaust   water   vapor,   non-condensible   gases   and   other impurities   which   would   prevent   the   system   from   operating. NOTE The   following   instructions   are   provided   for   use   by   refrigeration shops   furnished   with   only   the   most   basic   equipment. If  more sophisticated   equipment,   such   as   two-valve   or   four-valve   service manifolds   is   available,   it   should   be   used   by   making   appropriate modifications   to   these   instructions. a.  Connect  a  vacuum  pump  to  the  suction  service  valve  and  a  vacuum gauge   to   the   discharge   service   valve.   Start   the   pump   and   open   both service   valves.   Operate   the   vacuum   pump   until   pressure   in   the system   is   reduced   to   500   microns.   Close   the   suction   service   valve and   turn   the   vacuum   pump   off.   Let   the   unit   stand   in   this   condition for   at   least   one   hour.   If   the   system   holds   the   vacuum   without change  of  pressure,  continue  with  step  B. If   the   500-micron   vacuum cannot  be  held  for  one  hour,  break  the  vacuum  with  dry  nitrogen  and check   for   leaks.   If   500-micron   vacuum   cannot   be   achieved,   one   or more   of   the   following   reasons   may   account   for   the   problem. 5  -  1  5  

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