In the refrigeration system, the compressor, as a core component, undertakes the key task of promoting the circulation of refrigerant to achieve heat exchange. Once the compressor fails or burns out, it will cause a series of problems to the entire refrigerant system. The following are several common contamination situations:
The residual refrigeration oil has been carbonized, contains acidic components and becomes turbid, accumulating inside the pipe.
After the compressor is removed, the original system pipe will come into contact with the air, resulting in condensation and increasing the residual moisture. These moisture forms a dirt film after contacting the copper pipe and other components, affecting the operating performance of the new compressor.
The copper, steel, and alloy particles produced by wear flow into the pipeline and block some small pipes.
The original dryer quickly absorbs a large amount of moisture.
In this case, the system usually emits a strange smell, which can be easily identified.
The result of directly replacing a new compressor without treating the system
If the contaminants in the system are not cleaned first, directly replacing a new compressor will cause the following problems:
It is difficult to completely complete the vacuum pump, and the vacuum pump may be damaged.
The newly injected refrigerant can only play a cleaning role, and the overall contamination of the system still exists.
The new compressor and its refrigerant oil will be contaminated within 0.5 to 1 hour, and then secondary contamination will begin:
The refrigerant oil loses its purity and destroys its original lubricating properties.
Metal particles entering the compressor may damage the motor insulation layer, causing a short circuit and burning again.
Metal particles settle in the oil, increase the friction between the shaft and the sleeve, and cause mechanical bite.
The mixture of refrigerant, oil and original contaminants will produce more acidic substances and moisture.
Copper plating is intensified, the mechanical gap is reduced, and the friction is increased, which eventually leads to jamming.
If the original dryer is not replaced, it will continue to release absorbed moisture and acidic substances.
Acidic substances will gradually erode the insulation layer of the motor enameled wire.
The cooling efficiency of the refrigerant itself decreases.
Under the above conditions, the new compressor is likely to fail completely within a month.
How to deal with a burnt or faulty host refrigerant system
Handling a burnt or faulty compressor is a relatively cumbersome process, which is often ignored by technicians, or even simply thought that replacement can solve the problem. This attitude can lead to misunderstandings about compressor quality issues or disputes about improper use.
Case 1: The motor is not burned, the current is normal, only the noise is loud
The refrigeration oil has not deteriorated, and the system pipeline is not obviously polluted.
Remove the original dryer, use high-pressure nitrogen to purge the pipeline from the high-pressure end, and purge the pipeline and components in sections.
Install a new compressor and a new dryer, and pressurize nitrogen for leak detection.
Evacuate from both the high-pressure and low-pressure ends at the same time.
Add liquid refrigerant from the liquid pipe, and test start after reaching 80%-90% of the refrigerant volume. (The compressor needs to be preheated for 2 hours)
Case 2: The motor is not burned and can be operated, but the current is large and overloaded
The refrigeration oil has a slight burnt smell and discoloration. The system pipeline is relatively clean, but the metal surface has been acidified.
Install a new compressor and a new dryer, and pressurize to 10 kg/cm2 for leak detection.
Evacuate from both the high-pressure and low-pressure ends at the same time.
Add liquid refrigerant from the liquid pipe, and test start after reaching 80%-90% of the refrigerant volume. (The compressor needs to be preheated for 2 hours)
Pay attention to check power supply stability and excessive load.
Case 3: The motor has burned out and cannot run
You can choose to solve it by chemical cleaning or high-pressure nitrogen purging.
Chemical cleaning method: Use a cleaning agent to circulate and clean the system, then blow it dry with high-pressure nitrogen.
High-pressure nitrogen purging method: Remove the dryer, blow through the pipeline with high-pressure nitrogen, install a new dryer, and check all components.
