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Page Title: EXPANSION VALVE CONT.
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TM5-4120-387-14 (3) If a leak is suspected or indicated, test per paragraph 5-9. b. Testing  and  superheat  adjustment. The expansion valve as supplied with the unit is preset at the factory. This  valve  should  not  be  adjusted  unnecessarily. (1) Performs refrigerant pressure check on unit in accordance with paragraph 5-12. 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) Loosen the screws and nuts in the bulb straps that attach the sensing bulb to the suction line, and pull the bulb out of the straps. Use care to not damage or kink the capillary. The following test must be conducted with the power on. Exercise  extreme  caution. Do not be misled by term “low voltage. ” Potentials as low as 50 volts may cause death under adverse conditions. (4) Place the sensing bulb in a container of ice water or crushed ice so that it is reduced to a temperature near 32°F (O°C). (5) Set the Temperature control thermostat knob fully DECREASE (counter- clockwise), fan speed to LO SPEED, place one hand on the exposed suction return line, and start the air conditioner in COOL mode.  If a drop in temperature is felt on the suction return line,   the expansion valve is not closing fully and should be replaced. If the return line temperature remains constant, check the pressure gage;   it should indicate approximately 58 ±2 psi (4.0 ±O.14 kg/cm2). If the pressure is not within the above limits,   test the operation of the quench valve  (para  5-20)  and  the  pressure  regulator  valve  (para  5–25)  before  attempting adjustment  of  the  evaporator  expansion  valve. When performing the next test,   turn the air conditioner to OFF as soon as a definite drop in temperature is felt on the suction return line. If the  test  conditions  are  continued more than  a few seconds, the expansion valve will fully open and  an  excessive  flood-back  of  liquid  refrigerant  may  damage or destroy the compressor. 5-59

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