Compressor Serviced/Replaced

Compressor Serviced/Replaced

The amount of oil drawn out during a recovery procedure will be dependent on the state of the system and the rate of recovery. The quantity will be approximately 30 to 40 ml; this may vary, and the figure is given only for guidance. The oil separator vessel in the recovery equipment must be clean and empty at the start of the process so that the quantity of oil which is drawn out may be accurately measured.
Oil may be added by three methods, 1 and 2 being direct into the system and 3 with the compressor off the vehicle;
1. Via the recovery/recycle/recharge station.
2. Proprietary oil injector.


NOTE: Equipment manufacturer's instructions must be adhered to when using direct oil introduction.


3. Directly into the original, or new unit, because of rectification work to the existing compressor, or the need to fit a new compressor.


Original
From an existing compressor, drain the oil into a measuring cylinder and record the amount. Flush the unit out with fresh PAG oil and drain thoroughly. Replenish the compressor with the same amount of PAG oil that was originally drained out and immediately plug all orifices ready for refitting to the vehicle.

New
Drain and discard the transit lubricating oil from a new compressor before it is be fitted. An adjustment must then be made to avoid over-filling the system, by taking into account;
a) the quantity found in the original compressor.
b) the quantity deposited in the recovery equipment oil separator from the charge recovery operation.

Typical example:
Drained from original compressor 50 ml
Recovered from oil separator 40 ml
Quantity to be put in new compressor 50 + 40 = 90 ml

Please note that the discrepancy between the cumulative figure of recovered and drained oil and the nominal capacity of 180 ml is caused by normally unrecoverable oil being trapped in components such as the condenser, receiver/drier or evaporator.
The previous statements apply even if a problem has occurred due to oil leakage. The amount of oil lost due to leakage is generally small, so to avoid over-filling please follow the example.
If however the recovery process has not been necessary because refrigerant has also been lost, then ONLY replace the quantity drained from the original compressor.