Several failure phenomena and solutions of dehumidifierjiu0 edited on2017-05-25 06:05:15 171 views
Several failure phenomena and solutions of dehumidifier
When the dehumidifier is in use, due to improper operation or abnormal quality of the dehumidifier itself, it can not run normally and dehumidification.
Now, make the following analysis of the dehumidifier fault:
Dehumidifier fault 1:
The wind speed of the outlet is low;
Measure the resistance value of tuyere motor with multimeter, less than the normal value.
It is found out that the coil of the outlet fan is short circuited, the fan speed is reduced and the air flow is reduced.
Troubleshooting a new fan motor.
The compressor of the dehumidifier is a rotary compressor, which has poor heat resistance and slow rotation speed of the fan motor,
The amount of air flowing through the condenser decreases, and the compressor exhaust pressure rises, overheating protects, and the compressor stops.
If the temperature is lowered for a long time, the compressor can start again, so the opportunity of dehumidification is stopped when it is opened.
Dehumidifier fault 2:
The dehumidifier runs normally and the relative humidity is 85% ~ 90%, but the dehumidification rate is very small
Turn on the air inlet of the dehumidifier, let the dehumidifier run and check the evaporator,
Only a few U tubes have condensed water, and other U tubes are dry;
Inspection found a pipeline oil. Judgement as leakage.
Release the refrigerant, weld the interface leaks, re vacuum, inject refrigerant, troubleshooting.
It may be because the machine is used for too long and the tube is aging.
Dehumidifier fault 3:
The air filter screen and evaporator condenser surface is very clean
No leakage of oil pipeline surface
Capillary near the evaporator has frost, soon stop, defrost for a period of time, and the compressor runs.
Use hot towel to wrap capillary and evaporator interface, dehumidification normal. Refrigeration system ice jam.
Clear off excess refrigerants,
0.3MPa pressure of nitrogen into the system, vacuum pump vacuum about 20min,
Add equal quantities of refrigerant to refrigeration operation 30min,
Stop vacuum, excess 30min, check vacuum.
Fill in the same amount of refrigerant, turn on the machine and troubleshoot.
During maintenance, water vapor may enter the system or be filled with refrigerant with more water content,
Because of the function of refrigerant throttling cooling, water forms ice crystal collection at the interface of capillary tube and evaporator.
Blocked capillary, refrigerant flowing, not dehumidification,
The compressor is stopped by protection and the air heating capillary melts the ice crystals.
The compressor is running again and again, and the dehumidification effect becomes worse.
Dehumidifier fault 4:
After the dehumidifier is started, the noise is increased and the dehumidification effect is poor
Check the structure of dehumidifier, no exception, the placement is stable;
Inspection noise comes mainly from compressor
No abnormal appearance of evaporator, no frosting phenomenon
There is much frost in the return air pipe, so the excessive charging of refrigerant is judged.
After proper discharge of some refrigerant, turn on the machine and restore the dehumidifier to normal;
When the dehumidifier is repaired, too much refrigerant is injected.
The liquid droplets cause the noise of the compressor to increase, and the droplets in the return gas continuously evaporate in the back air pipe, causing the surface of the return air pipe to be frosted.
Dehumidifier fault 5:
The surface of the low pressure pipe of dehumidifier is frosting, and the dehumidification effect becomes worse
After the period of capillary frost, and the low pressure pipe interface found traces of oil, to judge the fault for leakage
The capillary front section of frost, pipes not found traces of oil filter clogging, judgment;
After the leak, repair welding pressure and leak of refrigerant;
Dehumidifier fault 6:
After two years, the dehumidifier has been repaired because of dirt and can not be dehumidification,
Later, the compressor and fan operated normally, but not dehumidification.
The air filters and evaporator surfaces are clean;
The operating current of the compressor is different from that of the last one,
The current was very high during the last fault and the current was very small at this time,
The refrigerant is seriously leaking.
Check leak, maintenance, troubleshooting.
Large leakage of refrigerant. The displacement of the compressor is reduced, the load is small, and the operating current is reduced.
Dehumidifier fault 7:
The dehumidification effect of dehumidifier is obviously worse,
The power consumption increases, and after a period of work, the compressor automatically stops
Check the evaporator, surface condensation of water, proved no clogging;
The condenser has been found not to have a large temperature difference between the tubes, which proves that the condenser is also free of obstruction;
The compressor will stop automatically after working for a period of time, while the fan running and control system is normal;
Check overheat protection of compressor without action;
It is estimated that the protector in the compressor is out of order and the compressor will stop automatically.
It is found that the winding resistance of the compressor is different from that of the refrigerator when it is stopped.
Replaced with a new compressor, dehumidification function returned to normal.
The original compressor due to winding resistance instability, the power supply winding temperature rise faster,
The operation of the protector in the compressor can cause the compressor to stop automatically and can not do normal dehumidification.
As the internal resistance increases, the power consumption also increases.
Dehumidifier fault 8:
The dehumidifier has been disabled for a long time and can not be started when it is used again
Check the power supply voltage is normal, the current is very large,
But cannot start, judge is compressor hold axle.
Start by knocking.
To keep the center position with a wooden hammer, along around,
Knock on the lower part of the top-down. After knocking many times,
The motor rotates, working electricity
published on：20170525 05:44:35 guangzhou