Common causes of thermal protection of refrigeration system compressor

Common causes of thermal protection of compressors in refrigeration systems

I. Common causes of thermal protection of compressors in refrigeration systems:

1. Overload protection: When the exhaust pressure of the compressor exceeds the rated value, the compressor will start the overheat protection program.

2. Phase loss operation (one phase is missing in three-phase electricity): When the compressor has a single-phase current that is too large or phase loss during operation, it will also cause the compressor to shut down.

3. Ambient temperature is too high or too low: Ambient temperature that is too high or too low will affect the normal operation of the compressor, thereby causing its overheat protection.

II. How to prevent and solve the above problems?

1. Regularly check whether the power plug and socket of the air conditioner are intact

2. Regularly clean the air conditioner filter (usually once every six months)

3. Regularly check whether the indoor and outdoor unit connection pipes are damaged or leaking

4. When using the air conditioner, avoid placing the outdoor unit in direct sunlight

5. Do not turn the air conditioner on and off frequently

6. Do not use the same air conditioner continuously for a long time

7. If a fault is found, it should be sent for repair in time

III. Sharing of maintenance experience

1. Judgment and maintenance of refrigeration system faults

(1) Judgment method for insufficient refrigerant

The main reason why the air conditioner does not refrigerate is due to the lack of refrigerant, so first check for leaks. If a leak is found, repair it and test the machine after evacuation; if there is no leak, it can be determined that the fault is caused by lack of refrigerant. At this time, open the low-pressure valve outlet pipe joint to release some gas and then reconnect it to see if it can be turned on and work; if it can operate normally, it means that the lack of refrigeration is caused by lack of refrigerant.

(2) Inspection method for pipe blockage

During maintenance, the machine often stops working due to pipe blockage. In this case, you can first check the heat sink of the condenser to see if it is blocked by dust or other objects, so that the surface of the heat sink cannot dissipate heat normally, resulting in poor heat dissipation of the condenser, causing abnormal operation of the machine or even damage to the machine; then use soapy water to smear on the evaporator fins to observe whether there are bubbles. If there are bubbles, it indicates that there is a blockage here, otherwise it is a normal state.