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INSPECTION - TM-5-4120-375-14_255
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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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DIAGNOSING COMPRESSOR MOTOR BURNOUT
TM-4120-375-14 COMPRESSOR (CONT.) LOCATION/ITEM ACTION REMARKS TEST 6.  COMPRESSOR MOTOR BURNOUT Burnout of a compressor motor is indicated by lack of continuity of the motor  windings  and  the  condition  of  compressor  oil,  which  must  be  determined after  the  compressor  has  been  removed  from  the  refrigeration  system. Causes of  compressor  motor  burnout  include  the  following: a. Low line voltage,   which  causes  motor  windings  to  overheat. Before  burning  out  completely,  the  overheated  windings  cause  chemical breakdown of the refrigerant and the oil to form sludge and other system contaminate. b. Loss of refrigerant. An inadequate charge of refrigerant gas in the system  reduces  the  amount  of  cooling  gas  within  the  compressor,  resulting in gradual overheating of the motor and failure of the winding. c. High Head Pressure. High head pressures can be caused by clogged or dirty condenser coils or screens,   or by an inoperative condenser fan. High  head pressure  requires  the  compressor  to  work  harder,   creating  additional  heat which ultimately can result in motor burnout. Poor  ventilation  around  the condenser,   and  extremely  high  ambient  temperatures  can  also  cause  motor failures. d. Moisture in system. Leakage  of  air  into  the  refrigeration  system  starts a chain reaction which can result in motor burnout. Air contains oxygen and  moisture  which  combine  with  refrigerant  gas  to  form  hydrochloric  and hydrofluoric  acids. These combine with compressor oil to form an acid sludge which is carried throughout the system, and which attacks the motor windings,  causing  short  circuits  and  burnout. 5-88

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