The solenoid valve heat pump air conditioners for cooling and heating to convert electromagnetic switching valve control, belonging to two four-way valve. Is composed of three parts of the main valve, the pilot valve and the solenoid. Air conditioners and refrigeration systems, in addition to outside the compressor process is the most complex, the most sophisticated components, but also to check and repair trouble, it is difficult to judge good or bad, not easy troubleshooting a part. In addition to the control circuit failure common faults for the heart valve does not operate, blockage, leakage caused by the slider does not move or action is not in place.
Failure phenomenon
1 solenoid valve commutation
If the heart valve or the slider can not move, and fixed in one position, the air conditioner cooling or heating not interchangeable. Generally the most common faults for only cooling, not heating, and cause air conditioners anti chilling by cold air protection, the outdoor unit running, the indoor unit is not blowing hot air, fault light after shutdown.steam solenoid valves
2 solenoid valve coil short circuit
Air conditioner conversion heating operation, the solenoid valve coil due to short-circuit current is too large, severe burn control board fuse or cause tripping, causing the machine is not working properly.
3 solenoid valve slider deformation
If the distortion in the slide, even if the solenoid valve coil is energized, the pilot valve valve core will not operate, causing the slider to change the inside of the valve body to not in place, string gas compressor high-pressure gas to form a short cycle, caused by the high temperature, high pressure until frequent thermal protection, and ultimately burn out the compressor insulation layer. For the entire system, high pressure cut-off valve to the low pressure side leakage, high / low dropout voltage decreases. Usually presents no refrigeration, no heating or poorly.flange solenoid valve
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