In response to environmental problems, many of the existing units were converted from CFC, HCFC and H FC refrigerants. In some projects of modernization, lubricating oils are used CFC refrigerant does not have properties that make it compatible with the new refrigerant. Thus, the old grease should be removed from die Carter, evaporator, condenser, receiver and other components before new grease is added to the system. As the oil and wax can also exist in the form of a film on the inner surfaces of the system, flushing may also be necessary. The best way to flush the system to distribute completely miscible liquid refrigerant freon through the system, proper recovery when you shut the system.
If the liquid CFC washing is not an option, the new oil that is used with the substitution of the refrigerant can also be used as a flushing agent. In this process, the CFC refrigerant is recovered and how much of the old oil, and also be removed. The system is charged with the corresponding number of new oil and recovered CFC refrigerant is returned to the unit.
The refrigeration system is placed into operation, so that the refrigerant can mix the old oil in a solution with the new oil. After working for at least eight hours, refrigerant recovered and contaminated oil is removed from the crankcase. Checked the oil oil test kit or Refractometer to determine if the level of pollution is below the level specified for the new grease.
If oil contains more pollutants from the source oil than acceptable, fresh butter and recovered CFC refrigerant is placed back in the system and die die, the process is repeated. When crankcase oil test indicates that the oil is in reasonable condition, die device can be charged with a new HCFC or HFC refrigerant...
Industrial