Specific analysis of common failure phenomena of dehumidifiers

Dehumidifier, more and more accepted by people, production workshops, storage warehouses and even daily living, you can see the figure of dehumidifier. As an electrical appliance, there will inevitabl...

dehumidifier, more and more accepted by people, production workshops, storage warehouses and even daily living, you can see the figure of dehumidifier. As an electrical appliance, there will inevitably be failure phenomenon. Below, PARKOO will take you together to analyze the phenomenon of dehumidifier failure, further understanding of dehumidifier.

Failure phenomenon 1, dehumidifier start soon after the shutdown, after a long time to start again, dehumidification effect is very poor

Specific analysis of common failure phenomena of dehumidifiers

Check the fault:

(1) Measure the wind speed of the air outlet is lower than normal;

(2) using a multimeter to measure the resistance value between the fan motor lead wires, found than the normal value is much lower.

Repair method:

According to the detection of the situation is judged to be fan motor winding coil turn-to-turn short-circuit, resulting in fan speed reduction, wind volume reduction and this failure. Replace a new fan motor, the fault is eliminated.

Cause analysis:

Dehumidifier compressor for the rotary compressor, heat-resistant poor, fan motor speed down, the wind volume is reduced that flow through the condenser wind volume is reduced, resulting in increased compressor discharge pressure, resulting in compressor overheating protection (shutdown), compressor overheating after a long period of time to cool the temperature can be reduced to normal, so it is necessary to wait for a long time to cool down the compressor to start again.

Failure phenomenon 2, dehumidifier running normally, the relative humidity of the environment for 85% to 90%, but the amount of dehumidification is very small!

Check the fault:

Open the dehumidifier air inlet plate, let the machine run, check the evaporator, found that only a few U-shaped tube with condensation, the other U-shaped tube surface dry; further inspection found a pipeline interface with oil. Judgment for leakage.

Maintenance method:

Discharge the refrigerant, weld the interface leakage, re-vacuum, refrigerant injection.

Failure phenomenon 3: dehumidifier repair, power on the boot, found that the noise increases, the dehumidification effect is very poor!

Check the fault:

(1) check the dehumidifier structure is not abnormal, placed also smooth;

(2) Check the noise mainly from the compressor

(3) The shape of the evaporator is not abnormal, no frost phenomenon

(4) return tube frost more, judge the refrigerant charge is too much.

Maintenance method:

Properly drain off some refrigerant and then turn on the machine, the dehumidifier back to normal.

Cause analysis:

In the maintenance of the dehumidifier into, not according to the standard requirements of the refrigerant charge, charge too much, resulting in liquid shock compressor noise increases, back to the liquid droplets in the return air tube continues to evaporate and make the return air tube surface frost.

Failure phenomenon 4: dehumidifier low-pressure tube surface frost, dehumidification effect deterioration

Check the fault:

(1) capillary tube after the frost, and low-pressure pipe interface with oil stains found, determine the fault for leakage

(2) capillary tube before the beginning of frost, the pipe did not find traces of oil, the judgment is that the filter is clogged.

Maintenance method:

(1) leak detection, welding repair and then pressurized leak detection, charging refrigerant;

(2) Replace the filter.

Failure phenomenon 5: dehumidifier dehumidification effect deteriorated significantly, but the power consumption increases, the compressor automatically stops after a period of time.

Check the fault:

(1) check the evaporator, the surface of the condensation is uniform, proving that there is no blockage;

(2) check the condenser also did not find a large temperature difference between the tubes, proving that the condenser is not blocked;

(3) Compressor work for a period of time after the automatic shutdown, and fan operation and control system is normal;

(4) Check the compressor overheating protection, there is no action;

(5) is estimated to be the compressor failure, is the compressor protector action, so that the compressor automatically stop. Inspection found that the compressor just stopped when the winding resistance and cold resistance value is not the same.

Maintenance method:

Replace a new compressor, dehumidification function back to normal. The original compressor due to the winding resistance is not stable, power winding temperature rise faster, so that the compressor protector action, so that the compressor is constantly automatic shutdown and can not carry out normal dehumidification. As the internal resistance increases, the power consumption also increases.

Failure phenomenon 6: dehumidifier out of service for a long time, and then use the compressor can not start!

Check the fault:

Check the power supply voltage is normal, hear "humming" current sound, current is very large, but can not start, the judgment is that the compressor clutches the shaft.

Maintenance method:

Try to start the knocking method. With a wooden hammer (or hammer below the wooden block) first in the center of the top position, and then along the surrounding area, in the middle of the lower part of the top and bottom knocking. After knocking many times, the motor rotates, and the working current is normal.

Failure phenomenon 7: dehumidifier work found when running a lot of vibration, dehumidification effect deterioration, or even can not dehumidification.

Check the fault:

(1) check the evaporator, found that the evaporator surface without condensation appears;

(2) touch the high-pressure tube, only warm (normal should feel hot) can be judged to be refrigerant leakage;

(3) check the refrigeration tube system, found that the high-pressure tube and condenser interface with oil (leakage point), is a strong vibration caused by rupture.

Maintenance method:

(1) with the oil trace method (or soap bubbling method) to find the crack, repair the leak repair;

(2) Pressure leak detection, vacuum, refill refrigerant;

(3) power on and off to find the cause of mechanical vibration, found that the unloading device can not be acted on, is caused by the failure of the electromagnetic reversing valve.

(4) replacement of the same type of electromagnetic reversing valve, and then re-leakage, vacuum, charge the required amount of refrigerant, and then boot, the problem is solved.

Failure phenomenon 8: dehumidifier running normally, but the amount of dehumidification is very little!

Check the fault:

(1) high and low pressure is too low, check the pipeline without oil, is not enough refrigerant;

(2) high and low pressure is too low, found leakage;

(3) high and low pressure is too high, the return pipe has dew phenomenon, is too much refrigerant;

(4) pipeline valve failure, not according to the required action;

(5) piping has half blocking phenomenon, before and after the blocking mouth has a more obvious temperature difference;

(6) system cycle refrigeration frequently start and stop, with a hot towel wrapped in the capillary tube outlet, refrigeration is normal, the judgment is the capillary tube at the ice leakage;

(7) evaporator or condenser leakage;

(8) Compressor compression is bad (exhaust pressure is very low).

Repair Methods:

(1) Charge refrigerant to the specified quantity;

(2) After repairing the leakage, check the leakage and vacuum again, and add the refrigerant that meets the specified requirements;

(3) Discharge the appropriate amount of refrigerant;

(4) repair or replacement of faulty valves;

(5) Repair or replace piping;

(6) Discharge the refrigerant, use 0.3MPa nitrogen to blow away the gas in the tube, then evacuate and inject the specified quantity of refrigerant;

(7) Repair or replace the evaporator or condenser of the same type and specification;

(8) Repair or replace the same type of compressor.

Note:This article analyzes the fault repair method, non-professional maintenance personnel may not privately disassemble the dehumidifier, so as not to cause danger!

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