Air conditioner pneumatic valve solenoid directional common failures and troubleshooting methods

electromagnetic reversing pneumatic valve is heat pump air conditioner, refrigeration and heating work conversion of electromagnetic switch control pneumatic valve, belong to two pneumatic valve spool. By the main pneumatic valve, pneumatic valve guide and electromagnetic coil of three parts. Is in addition to the compressor in air conditioner refrigeration system technology the most complex, precision parts, also is a trouble to inspection and maintenance, it is difficult to judge, not easy to troubleshoot a widget. In addition to the control circuit fault common faults for pneumatic valve core movement, the sliding block jams, leakage is not action or action does not reach the designated position, etc. Electromagnetic pneumatic valve not reversing
if electromagnetic pneumatic valve core or slider cannot move, and fixed in one place, the air conditioner cooling or heating can't transform each other. Generally the most common fault is only more cooling, not heating, at the same time cause the air conditioner met protection, blow a cold wind over the run outdoor, indoor machine don't blow hot air, according to trouble light after downtime. Electromagnetic solenoid coil short-circuit
air conditioner conversion operation of the heating, electromagnetic solenoid coil due to the short circuit current is too large, serious when burning main control board to fuse or trip cause, cause the machine doesn't work. Solenoid pneumatic valve slider deformation
if the slider deformation, even if the electromagnetic coil of pneumatic valve has electricity, pneumatic valve pneumatic valve core will not guide action, leading to the slider directional control does not reach the designated position, make the pneumatic valve internal mixes up, compressor within short cycle, high pressure gas formation caused by high temperature and high pressure, frequent thermal protection, eventually burn out compressor insulation. For the whole system, by the pneumatic valve and high pressure pressure to low pressure side leakage, reduce high/low pressure difference. Usually involves not refrigeration, heating, or for the effect not beautiful. Electromagnetic reversing solenoid coil open circuit and short circuit or burn, pneumatic valve core can not suck, causing slider not action. Should be replaced. Pneumatic valve solenoid pneumatic valve armature stuck, heart cannot move, causing the slider is not action. Can open the pneumatic valve body wash. Power supply voltage is lower than the rating of pneumatic valve, pneumatic valve pressure difference than pneumatic valve capacity of imports and exports, while the pneumatic valve often issued a 'little bit' noise, causing pneumatic valve core and can't do it. Should improve the power supply. Electromagnetic flow pneumatic valve installed upside down, causing pneumatic valve core is not action. Flow should be adjusted. System of high temperature, high pressure and machine contains impurities, cause the slider deformation, jammed. Should be replaced as well. Pneumatic valve core remanence absorb or pneumatic valve core is jammed, solenoid pneumatic valve cannot be closed when the power is cut off. Cleaning the adjustment, if no effect change. Solenoid pneumatic valve seal is damaged or tighten screw loosening, cause refrigerant leakage. Change the gasket and tighten the screws. Pneumatic valve on capillary blocked or fracture; Or system cause serious leak slider not action. Clean the capillary capillary or with slightly rough fracture copper pipe welding. Pneumatic valve is memory is dirt pneumatic valve, pneumatic valve seat or damaged needle and spring force is too small, cause electromagnetic pneumatic valve closing is lax. Clean and adjust or replace the spring.
in addition, if the reversing pneumatic valve internal leak, result in high pressure refrigerant gas leak to the low voltage side, can't make the reversing establish normal pressure on both ends of the pneumatic valve piston, reversing pneumatic valve should be replaced. If cooling system pressure difference is too big, cannot make the reversing solenoid reversing, or find leak point pressure check the refrigeration system, and fill the refrigerant. If four-way solenoid slider not action or action does not reach the designated position, check the judge can use the screwdriver with wooden handle, tapping the pneumatic valve body and is not connected or disconnected when v ac power supply, repeated several times, heard a armature chorus and pneumatic valve body gas reversing sound absorption, can determine the reversing pneumatic valve basic returned to normal work.