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Page Title: 5-22. EXPANSION VALVE (PRIMARY)
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TM 9-4120-389-14 5-22.  EXPANSION VALVE (PRIMARY) Preliminary Procedure: Remove top cover (See para.  4-14) WARNING Voltages  used  can  kill.    Always  disconnect  power  cord  to  air  conditioner  before performing any internal maintenance.  Shutting off at its control module does not disconnect unit power. a. Inspection (1) Inspect  for  evidence  of  leaks,  kinked,  or  otherwise  damaged  capillary  line,  and  loose  or missing mounting hardware. (2) Check sensing bulb to see that it is securely clamped. (3) If a leak is suspected or indicated, test per para.  5-6. b. Testing.  The expansion valve as supplied with the unit is preset at the factory.  This valve cannot be adjusted. (1) Perform a refrigerant pressure check on unit in accordance with para.  5-9.  Leave gages or service manifold attached. (2) Remove the suction line insulation from the area of the sensing bulb.  Observe location and position of bulb for reinstallation. (3) Remove two screws and nuts from two clamps on sensing bulb. WARNING The   following   test   must   be   conducted   with   the   power   on.      Exercise   extreme caution. CAUTION Use care to not damage or kink the capillary. (4) Place  the  sensing  bulb  in  a  container  of  ice  water  or  crushed  ice  so  that  it  is  reduced  to  a temperature near 32 deg.  F (O deg.  C). 5-56

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