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TM5-4120-376-14
5-19. REFRIGERANT VALVES AND RELATED TUBING/Test, Repair, Replace (Cont)
LOCATION/ITEM
EXPANSION VALVE (THERMAL) /QUENCH VALVE
Test:
CAUTION
Do not let liquid refrigerant flood back into the compressor any longer than 1-2
seconds. The expansion valve will be wide open during the following procedure.
Excessive flood-back of liquid refrigerant will damage the compressor.
NOTE
Testing expansion valve is to be done while air conditioner is operating and
supplying cooling air.
1. Connect power.
2. With the air conditioner in off position, let the suction line warm up to ambient
temperature.
3. Place sensing bulb in a container of ice water or crushed ice (32°F or 0°C).
4. Start the air conditioner by setting the mode selector at COOL, and the temperature
selector at maximum COOLER. Remove the sensing bulb from the ice water, and hold it in one
hand to warm it while feeling the suction line. If the suction line temperature drops, the valve
is operating properly. Stop the air conditioner at once, and reinstall the sensing bulb. If the
temperature of the suction line does not drop, stop the air conditioner and replace the expansion
valve and quench valve.
SOLENOID VALVE (L-1) (L-2)
Test:
1. Apply external 24-28 VDC to the connector pins A and B of electrical connector P-8.
2. Listen for a sharp click which indicates that the solenoid valve plunger is working
properly.
3. If the solenoid valve plunger fails to work properly the solenoid valve coil is defective,
replace defective solenoid valve coil.
5-38
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