What are the reasons for the constant temperature and humidity test machine compressor not cooling?

What are the reasons for the constant temperature and humidity test machine compressor not cooling?

Because the industry operators occasionally encounter the situation that the constant temperature and humidity test chamber is not cooled, in order to let the majority of employees

The personnel have a clearer understanding of the performance of the equipment. The Shanghai Huanqi Test Equipment Factory is here today.

To share and solve the solution that causes the compressor of the constant temperature and humidity test machine to not cool.


Reason one:

1. Since the temperature is not maintained, observe whether the refrigeration compressor can be started during the operation of the test chamber.

The compressor can be started during the operation of the environmental test equipment, indicating the electrical line from the main power supply to each compressor

The road is normal and there is no problem with the electrical system.


2. Touch the exhaust and suction lines of the R23 compressor of the main unit by hand and find that the temperature of the exhaust line is not high.

The temperature of the gas line is also not low (unfrozen), which also indicates the lack of refrigerant in the main unit (R23).


Reason two:

1. There is no problem with the electrical system. Continue to check the refrigeration system. First check the low temperature of the two groups of refrigeration units (R23)

The exhaust and suction pressures of the compressor are lower than the normal value, and the suction pressure is evacuated, indicating that the main refrigeration unit

The refrigerant dose is insufficient.


2, the cause of the failure has not been determined, combined with the control process of the test box to further confirm the cause of the failure, the test box has two sets

Refrigeration unit.


3. One main unit and the other auxiliary unit. When the cooling rate is large, the two sets of units work at the same time.

At the beginning of the phase, the two units still work at the same time. After the temperature is initially stabilized, the auxiliary unit stops working, and the host group

To maintain temperature stability. If the host group R23 leaks, the cooling effect of the host group will be small, due to the cooling process, two

The unit works at the same time, so there is no phenomenon that the temperature is stable, and the rate of cooling is indicated to decrease. In the temperature maintenance phase, once the auxiliary

Help the unit to stop working, the main unit has no cooling effect, the air in the test box will rise slowly, when the temperature rises to a certain distance

Degree, the control system will start the auxiliary unit to cool down, reduce the temperature to near the set value, and then the auxiliary unit stops working again.

Repeatedly, there will be a malfunction.


At this point, it has been confirmed that the production failure of the constant temperature and humidity tester is due to the refrigerant R23 of the low temperature (R23) class of the main unit.

leakage. Check the refrigeration system, check with a leak detector and soapy water, and find a valve for a hot gas bypass solenoid valve.

The rod is cracked. Replace the solenoid valve, refill the system with fluorine, and the system is operating normally.


Summary: As can be seen from the above, the analysis and judgment of the fault phenomenon is basically easy and difficult, first "outside" and then "inside", first

After the "electrical" and "cooling" context analysis and judgment, familiar with and understand the principle and working process of the test chamber is to analyze the fault judgment

The basis of the barrier.


Of course, if you encounter more complicated technical problems, we still recommend that you contact the technicians of the equipment factory.

Repair and maintenance to avoid unnecessary losses.


HUMGINE products:: constant temperature and humidity test chamber, high and low temperature test machine, dust-free clean oven, blast drying oven, constant temperature drying oven, nitrogen cabinet, nitrogen-filled oven, high and low temperature box, secondary vulcanization oven.


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