Refrigeration solenoid valve common fault phenomenon and eliminate knowledge. Fault phenomenon: the solenoid valve does not work after power, troubleshooting: Check the power wiring is bad → re-wiring and connector connection, check the power supply voltage is within ± working range - → tune the normal position range, the coil is unsoldering → re-welding Coil short circuit → Replacement coil, working pressure difference is not suitable → Adjust the pressure difference → or replace the appropriate solenoid valve, the fluid temperature is too high → replace the appropriate solenoid valve, there is impurities so that the main solenoid valve solenoid valve stuck → cleaning, if the seal is damaged, replace the seal and install the filter, the liquid viscosity is too high, the frequency is too high and the life has been to → Replace the product Symptom: The solenoid valve can not be closed, the exclusion method: the main spool or iron core The seal is damaged → replace the seal, the fluid temperature, viscosity is too high → replace the opposite solenoid valve, there are impurities into the valve spool or moving core → cleaning, the spring has reached or deformed life → replacement, throttling Hole balance hole plug → promptly cleaned, the working frequency is too high or life has been to → re-election products or update the product Other fault conditions: internal leakage → Check if the seal is damaged or if the spring is poorly fitted. External leakage → Loose connections or damaged seals → Tighten the screws or replace the seal. Noises when energized → Loose and tightened fasteners on the head. Voltage fluctuation is not within the allowable range, adjust the voltage. Core suction surface impurities or uneven, timely cleaning or replacement. Example: Air conditioner electromagnetic reversing valve common fault and troubleshooting Electromagnetic reversing valve is heat pump air conditioner refrigeration and heating work conversion electromagnetic control switching valve, belonging to two four-way valve. By the main valve, pilot valve and the electromagnetic coil is composed of three parts. Is the air conditioner refrigeration system in addition to the compressor outside the process of the most complex and sophisticated components, but also check and repair more trouble, it is difficult to determine good or bad, not easy to troubleshoot a component. In addition to the control circuit fault common fault valve center is not action, blockage, leakage caused by the slider does not move or action is not in place. one. Symptom 1. Solenoid valve does not commutate If the solenoid valve or slider can not move, and fixed in a position, the air conditioner cooling or heating can not be converted to each other. Mostly the most common faults are mostly only cooling, heating can not be caused at the same time cause air conditioner blowout cold wind protection, outdoor unit operation, the indoor unit does not blow hot air, stop the display after the fault light. 2. Solenoid valve coil short-circuit Air conditioner conversion heating operation, the solenoid valve coil current is too large due to short circuit, severe burned fuse board or cause tripping, resulting in the machine can not work properly. 3. Solenoid valve slider deformation If the slider deformation, even if the solenoid valve coil has been energized, the pilot valve spool will not move, resulting in the slider is not in place to reverse, so that the body inside the string of gas, high pressure gas compressor to form a short cycle , Causing high temperature, high pressure, until frequent thermal protection, eventually burning out compressor insulation. For the entire system, the high pressure of the globe valve leaks to the low pressure side, reducing the high / low pressure differential. Often manifested as not cooling, no heating or ineffective. Second, the causes and troubleshooting 1. Electromagnetic reversing valve coil open, short circuit or burn out, the spool can not be attracted, causing the slider does not move. Should be replaced. 2. Solenoid valve armature is stuck, the valve heart can not move, causing the slider does not move. Can open the valve body cleaning adjustment. 3. When the power supply voltage is lower than the rated value of the solenoid valve, the pressure difference between the inlet and the outlet of the solenoid valve exceeds the valve opening ability. At this moment, the valve often emits "da da" noise, causing the valve core not to pull up. Should improve the power. 4. Solenoid valve installed upside down, causing the valve does not move. Should adjust the flow. 5. System temperature, high pressure and impurities in the machine, causing the slider deformation, stuck. Should be replaced as well. 6. Remaining magnetic valve or heart valve is stuck, after the solenoid valve can not be closed. Cleaning adjustment, such as invalid should be replaced. 7. Solenoid valve seal damaged or tightened loose screws, causing refrigerant leaks. Change the gasket and tighten the screw. 8. The valve capillaries are blocked or broken; or serious system leaks cause the slider not to move. Clean the capillary or a slightly thicker than the broken capillary brass sleeve welding. 9. Dirty valve memory, valve seat or valve needle damage and spring force is too small, resulting in the lax closure of the solenoid valve. Clean and adjust or replace the spring. In addition, if the internal valve leakage, resulting in high-pressure refrigerant gas leak to the low pressure side, can not make the valve piston ends to establish normal pressure, it should replace the valve. If the refrigeration system pressure difference is too large, can not make reversing valve commutation, it is necessary to check the refrigeration system pressure or find leaks, and to fill the refrigerant. If the four-way valve slider does not move or action is not in place, check the judge can use one end of the wooden handle screwdriver, gently tap the valve, and occasionally connected or disconnected AC 220V power supply, repeat several times, I hear armature suction Chorus and valve body gas reversing sound, you can determine the basic return valve to normal work.
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