During Component Replacement

When it is necessary to replace a refrigeration system component, certain procedures must be followed to ensure that the total oil charge on the system is correct after the new component is installed. During normal A/C operation, some refrigerant oil is circulated through the system with the refrigerant and some is retained in the compressor. If certain components of the system are removed for replacement, some of the refrigerant oil will go with the component. To maintain the original total oil charge, it is necessary to compensate for the oil loss by adding oil to the system with the replacement part.

ACCUMULATOR/DRIER
Drain the oil from the removed accumulator/drier through the Schrader valve fitting of the pressure switch with the valve stem removed into a calibrated measuring container. Add the same amount of clean refrigerant oil to the new accumulator/drier after installation.

NOTE: If more than 147.85 ml (5 oz) of refrigerant oil is removed from an accumulator/drier, it is an indication that the oil drain hole in the accumulator/drier is plugged. Always check the accumulator/drier for excessive oil if the compressor has been replaced for lack of performance.

EVAPORATOR CORE
Add 88.71 ml (3 oz) of clean refrigerant oil to the accumulator/drier inlet tube whenever the evaporator core is replaced. This will compensate for the refrigerant oil lost in the replaced evaporator core.

NOTE: Whenever an evaporator core is replaced, it will be necessary to replace the suction accumulator/drier.

CONDENSER
Add 29.57 ml (1 oz) of clean refrigerant oil to the condenser or the accumulator/drier if the condenser is replaced.

NOTE: Whenever a condenser is replaced, it will be necessary to replace the suction accumulator/drier.

OTHER REFRIGERANT SYSTEM COMPONENTS
Replacement of other refrigerant system components such as hoses, compressor valves, pressure switch, etc. do not require the addition of refrigerant oil unless the hose burst during system operation. Then the amount of oil to be added must be determined by the technician.