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TEST - TM-5-4120-375-14_256
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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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TM5-4120-375-14 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION/ITEM ACTION REMARKS TEST 7. DIAGNOSING COMPRESSOR MOTOR BURNOUT It.  is  important  to   diagnose   the   type   of   compressor   motor   failure   for   two   reasons Simple  failure,   without   motor   burnout,   does   not   require   the   extensive   cleaning of   the   entire   refrigeration   system   that   burnout   requires. Also,  motor   burnout indicates   other   problems   that   have   contributed   to   the   failure,   and   these   pro- blems   must   be   corrected   or   avoided   to   prevent   repetition   of   the   burnout.   After removal  of  a  bad  compressor  from  the  refrigeration  system,  remove  all  external tubing   and   tip   the   compressor  towards  the  discharge  port  to  drain  a  small quantity   of   oil   into   a   clear   glass   c o n t a i n e r. If   the   oil   is   clean   and   clear, and   does   not   have   an   acrid   smell,   the   compressor   did   not   fail   because   of motor   burnout.   If   the   oil   is   black,   contains   sludge   and   has   an   acrid   odor, the   compressor   failed   because   of   motor   burnout,   and   the   refrigeration   system must  be  cleaned  to  prevent  residual  contaminates  from  causing  repeated burnouts   when   the   compressor   is   replaced. 8 . CLEANING OUT THE REFRIGERATION SYSTEM AFTER BURNOUT WARNING Avoid   contact   with   refrigerant.   Acid from  contact   with   refrigerant. burns   could   result You  must  clean  the  entire  refrigeration   system   after   a   burnout   has   occurred, since  contaminates   will   have   been   carried   to   many   corners   and   restrictions   in the   piping   and   fittings. These   contaminates   will   soon   mix   with   new   refrigerant gas   and   compressor   oil   to   cause   repeated   burnouts.   To   clean   the   system thoroughly,   act   as   follows: a . b . c . d . Remove   the   filter-drier   in   accordance   with   paragraph   5-29   and   blow down  each  leg  of  the  refrigeration  system.  To  do  this,  connect  a cylinder   of   dry   nitrogen   (Item   8,   table   D-1)to   each   filter-drier connection,   in   turn,   and   open   the   cylinder   shutoff   valve   for   at   least 30   seconds   at   50   psig   (3.5   kg   cm   2)   pressure. Connect   the   two   filter-drier   fittings   with   a   jumper   locally   manufactured from  refrigerant   tubing   and   fittings,   and   install   a   pump,   reservoir   and filter   in   place   of   the   compressor. Disassemble  expansion  valve  and  quench  valve  and  temporarily  remove  the valve   cages.   Re-install   shell   of   power   assembly,   using   a   gasket between   power   assembly   and   body   to   prevent   leakage.   Tag   and   retain   valve cages   for   use   at   reassembly. Disassemble   solenoid   valve   in   accordance   with   paragraph   5-35. 5-89

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