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solenoid valve is open during the bypass cycle of operation and closed during the cooling cycle of operation. When testing these valves for proper operation,  determine  which  cycle  of  operation (bypass or cooling) the unit is in, and test opera- tion of valves accordingly. b. Removal.  Remove the valves (para 5-16). c. Disassembly. (1) Refer to figure 6-6 and disassemble the valves. Section III. EVAPORATOR 6-6. Evaporator Coil a. Removal.  Remove the evaporator coil (para 5-20) . b. Cleaning, Inspection, and Repair, (1) Clean the coil area with a wire brush. Avoid damage to the fins during brushing. Blow coil with compressed air. (2) Inspect the coil for bent fins, damaged coil runs, and internal leaks. (3) Straighten the fins with needle nosed pliers. Replace a coil with damaged coil runs or internal  leaks. (2) Disconnect tubing from body. d. Repair. Replace unserviceable parts with serviceable like parts. e. Reassembly. (1) Solder tubing to body. (2) Reassemble the valves by reversing the order of disassembly. f. Installation. Install the valves (para 5-16). AND  CONDENSER c. Installation. (para 5-20). COILS Install   the   evaporator   coil 6-7. Condenser Coil a. Removal. Remove the condenser coil (para 5-21). b. Cleaning,  Inspection,  and  Repair.  Clean, inspect, and repair the condenser coil in the same manner as outlined in paragraph 6-6. c. Installation.  Install the condenser coil (para 5-21). Section IV. COMPRESSOR/MOTOR ASSEMBLY AND BURNOUT CLEANUP   PROCEDURES 6–8. Compressor/Motor a. General.  The  compressor  motor  is  hermeti- cally  sealed  and  not  repairable.  An  inoperative compressor is usually due to a mechanical failure causing  the  compressor  to  freeze,  a  control  fail- ure,  or  a  motor  burnout.  If  the  compressor  has been mechanically frozen there may be a burnout. If   so,   the   compressor   unit   must   be   replaced. When the motor of a hermetically sealed unit fails, high  temperatures  may  develop  within  the  com- pressor  causing  a  breakdown  of  the  oil  or  re- frigerant,  resulting  in  formation  of  moisture, acid,  and  sludge,  all  extremely  harmful  to  the air  conditioner.  Repeated  burnouts  may  occur  if contaminants  are  not  completely  removed.  Refer to paragraph 6-9 for burnout cleanup procedures. The compressor has a suction line filter strainer to prevent damage to the compressor from contami- nation.  If  ‘a  compressor/motor  unit  fails  to  operate check   the   compressor   motor   for   resistance   as outlined in b. below. b. Resistance Measurements. (1) Model CH-620-1. (a) Remove  the  front  access  panel  (para 3-6) (b) Check the terminal’ to terminal res- istance (A to B, B to C, and C to A) with a multi- meter  set  on  the  ohm  scale.  Proper  resistance  is 1.37 ohms at 25° C. Tolerance is  ± 7  percent. (c)  Replace  the  front  access  panel  (para 3-6 ). (2) Model  CH-420-1. (a) Remove  the  front  access  panel  (para 3-6). (b) Check  the  terminal  to  terminal  resist- ance  as  indicated  in  (1)   (b)  above.   Reading should be 0.387 ohms at 250 C. with a tolerance of ± 7  percent. (c)  Replace  the  front  access  panel  (para 3-6) . 6-9. Compressor/Motor Burnout Cleanup Procedure a. General. (1) The  scope  of  this  procedure  pertains hermetic  compressors. to (2)  Experience  has  demonstrated  that  after a  hermetic  motor  burnout  the  system  must  be cleaned  thoroughly  to  remove  all  contaminants; otherwise a repeat burnout will occur. Failure to follow  these  instructions  as  quickly  as  possible will  result  in  an  excessive  risk  of  a  repeat  bur- nout, and damage to other system components. b. Cleanup Procedure,  Make certain a burnout 6-8

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