However, you will also need to pump down the system for 24 hours to create a deep vacuum.Īfter then, the system can be recharged using a virgin refrigerant. Here, you can now replace the compressor. This could cause the acid it produces to cling to the insides, thereby making it difficult to be removed. The latter is also required if the refrigerant in the unit is chlorinated. ![]() On the other hand, if the system was not acidic on testing, you need to install a suction line and acid removing drier. Likewise, if the system was not acidic, but has been adequately flushed, you can install a liquid line drier with activated alumina as well as a molecular sieve desiccant.įor instance, install a catch-all filter-drier in the suction line, an access valve on the gauge port, and oversized liquid-line drier in the liquid line. Therefore, the oil in these compressors needs to be checked for discoloration and replaced if need be. ![]() There are also chances that if the oil in the compressor is acidic, the oil in others will be acidic as well. If that’s the case, it would also mean that the oil in other compressors may have discolored as a result of overheating or burned oil migrating to these compressors. This is an optional step, but mandatory if the burned-out compressor is a part of a parallel group of compressors and uses the same suction & oil equalization with other compressors it is connected to. Also, check the water flow through the condenser loops and pass a descaler through the condenser loops. If they are not removed, they could plug up the unit and thereby contaminate the oil in the newly installed compressor. This process can be repeated in all refrigerant lines to ensure that residual oil locking contaminants are removed from the system. On the same note, the evaporator and condenser need to be flushed in order for the flushing agent that comes out, in the end, is as clean as possible. There is also a need to remove the TXV to prevent contaminants from being flushed into it. The aim is to remove winding insulation, burned oil, and other contaminants from the system. The next step is to flush the system, whether the system is acidic or not. That being the case, if the refrigerant is slightly acidic, use a suction filter dry-out kit to clean the system. The same applies if mineral oil was used to charge the compressor. This is because some burned out compressors are acidic (others like compressors with hydrofluorocarbon refrigerants and polyester oils are not acidic if burnt), especially if the refrigerants were chlorinated. Test the Refrigerant:Īn acid test has to be carried out on the refrigerant using the correct oil test kit to ascertain if it is acidic. There are 7 steps in compressor replacement: 1. However, the system needs to be cleaned out before the compressor is replaced. If a compressor grounds out upon testing, then it could be an indication that there are problems even though it may not indicate a burnout.
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