Operation guide after the refrigeration compressor burned out

Operation guide after the refrigeration compressor burned out

The refrigeration compressor is burned, and the residual refrigerating oil has been carbonized, acid-containing, and dirty in the pipe; and after the compressor is removed, the original system pipe must be corroded with the air, resulting in condensation effect, increasing the residual moisture, and copper pipes and pipe parts. After being corroded, it will cause a dirty film; the worn-out copper, steel, alloy dirt powder must flow into the pipeline to block some of the pores of the thin pipe, and the original dryer has quickly absorbed a large amount of water. When this happens, you can tell by smelling the smell.

　　 1. After the refrigeration compressor is burned out, the following problems must be confirmed before a new compressor can be replaced:

　　 1. Whether the contactor, overloader, computer, or temperature control in the control box has any quality problems, it must be checked one by one to confirm that there is no problem. 　　2. Whether various setting values have been changed, analyze whether the compressor is burnt due to the change of setting values or wrong adjustment.

　　 3. Check the abnormal condition on the refrigerant pipeline and correct it.

　　4. Make sure that the compressor is burned or stuck, or partially burned: Use a shaker to measure the insulation, and a three-meter to measure the coil resistance; talk to the relevant personnel of the customer to understand the general situation of the cause and effect, as a reference for judgment.

　　 5. Try to vent the refrigerant from the liquid pipe, observe the residue discharged from the refrigerant, smell its taste and watch its color. (After being burned, it has a sour, pungent and spicy smell)

　　 6. After removing the compressor, pour out a small amount of refrigerated oil and judge the situation by looking at it. Before leaving the host, wrap the high and low pressure pipes with tape, or close the valve.

　　 2. According to the above inspection work, there may be three refrigeration compressor failure conditions:

　　 1. The motor of the refrigeration compressor is not burned out, the current is normal, but the noise is loud. (Mechanical issues)

　　2. The motor of the refrigeration compressor is not burnt out, it can work, and the machinery is good, but the current is large and overloaded, and it is easy to trip.

　　 3. The motor of the refrigeration compressor has been burned out and cannot be operated.

　　 In the above three cases, the procedure to update the compressor is as follows:

　　 1. The compressor motor is not burned out, the current is normal, but the noise is loud. (Mechanical issues)

　　2. In this case, the oil is not odorous, and it is only polluted in a powdery gray form, sinking inside the compression, and the pollution in the system tube is not obvious.

3. Remove the original dryer, use nitrogen as much as possible, (pressure at least 7KG/CM2 or more) from the high-pressure end to blow clean the high-pressure end pipeline, as well as the segmented blown liquid pipe, low-pressure end parts, and observe the blow out Is it oil, dirt, water, or other abnormal shapes or foreign objects.

　　4. After replacing with a new compressor, install a new dryer and add nitrogen pressure to 10KG/CM2 for leak detection. When there is no leakage, the remaining nitrogen will be discharged into the atmosphere through the high-pressure side filling valve.

　　5. Vacuum simultaneously from the high and low pressure ends.

　　 6. Add liquid refrigerant from the liquid pipe to 80%~90% of the amount of refrigerant before starting the test. (The refrigeration compressor must be heated for 2 hours)

　　 3. The motor of the refrigeration compressor is not burned out, it can work, and the machinery is good, but the current is large and overloaded, and it is easy to trip.

　　 1. In this case, the oil has a slightly burnt smell and discoloration, and the system pipeline is still clean, but the metal surface has been acidified, and the inner wall of the copper pipe turns red.

　　2. After replacing with a new compressor, install a new dryer and add nitrogen pressure to 10KG/CM2 for leak detection. When there is no leakage, the remaining nitrogen will be discharged into the atmosphere through the high-pressure end angle valve.

　　3. Vacuum simultaneously from the high and low pressure ends.

　　 4. Add liquid refrigerant from the liquid pipe to 80%~90% of the amount of refrigerant before starting the test. (The refrigeration compressor must be heated for 2 hours)

　　Attention must be paid to this situation: the customer's original power supply stability and possible load are too large, or the result of stopping the control too frequently, if these are not solved, the danger will always exist, or it cannot be completely solved. The compressor motor has been burned out and cannot be operated. (There are two ways to solve it, fix it)

method one

　　 1. The most serious cases of this situation are oil and refrigerant smelly, burnt, spicy, oil black as black ink, and the inside of the tube is full of dirty black film and moisture.

　　2. Remove the dryer, and short-connect this part as a copper pipe joint or a temporary detachable pipe joint.

　　3. Use a chemical pump to pump the cleaning agent (trichloroethane, methylene chloride) into the piping system from the high-pressure pipe to clean the circulating flow.

Note:

　　A. Pay attention to the safety of the operator during cleaning.

　　B. During the cleaning, the cleaning agent will be found to be turbid from the clear state Yu Jiuyu, knowing the serious pollution situation after the compressor is burned, the cleaning agent must be replaced if necessary, and the cleaning agent must be cleaned multiple times.

　　4. The nitrogen pressure for replacement is about 7KG/CM 2~10KG/CM2, and the whole system is blown dry and cooled until there is no residual cleaning agent. (evaporation)

　　5. After replacing the compressor, install a new dryer and add nitrogen pressure to 10KG/CM2 for leak detection. When there is no leakage, the remaining nitrogen is discharged to the atmosphere through the high-pressure end valve.

　　6. ​​Vacuum simultaneously from the high and low pressure ends.

　　 7. Check all electrical appliances and power sources.

　　 8. Add liquid refrigerant from the liquid pipe to 80%~90% of the amount of refrigerant before starting the test. (The compressor must be heated for 2 hours)

Method Two

　　 1. Remove the dryer and blow through the entire pipeline with high-pressure nitrogen at a pressure of about 10KG/CM2.

　　2. Replace with a new dryer (The water absorption capacity of the liquid tube dryer must be twice as large as the original system.)

　　3. Check all parts, the quality of external control parts must be good.

　　4. Leak detection for the whole system, and the remaining nitrogen is discharged to the atmosphere by the high pressure end angle valve.

　　5. Vacuum simultaneously from the high and low pressure ends.

　　 6. Add liquid refrigerant from the liquid pipe to 80%~90% of the amount of refrigerant before starting the test. (The refrigeration compressor must be heated for 2 hours)

　　7. After operation, special attention must be paid to whether abnormal conditions occur, and emergency treatment.

　　 8. After starting to run for about half an hour, replace the dryer immediately and observe its contamination

　　 9. The second time the new dryer must run for another 3 hours, observe the results, and replace it if necessary until the system is completely clean.

　　 10. Finally, change the compressor refrigeration oil and observe the original new oil condition for the first time.

Note:

　　A. When replacing the dryer as above, do not let air enter the system again.

　　B. In severe cases, the compressor must be removed to change the oil, and the refrigerant must be released and replaced with a new one.

　　Note:

　　 1. Make a visual inspection of the whole machine again before starting up.

　　 2. Pay special attention to the power supply and withstand voltage insulation.

　　3. Do not start the compressor while adding refrigerant after vacuuming, as this will cause the compressor to lose oil and all previous efforts will be lost.

　　 4. Do not directly add liquid refrigerant from the low pressure end, which will cause liquid shock and mechanical failure.

　　 5. When the above procedures have been completed, before starting the machine, it is necessary to correct some of the poor quality of electrical appliances found during the original inspection of the machine.