Hi,
anybody can pl give me a cause for the following problem.

We have an air dryer (kaeser TI901) was originally running with two compressors of copeland make but they have failed at a time due to the mixup of condensate drain with the refrigerant circuit in its moisture trap & in one of its heat exchanger(two heat exchangers in series).

we removed the refrigerant circuit going into the mosture trap & faulty heat exchanger i.e bypassed. now the connection is directly from Th.Exp.Valve to other heat exchanger.

Installed 1no. Maneurop MTZ64 compressor and started the unit with one heat exchanger in circuit. It has run for few days but again failed the compressor due to its oil has flushed out from compressor(oil remaind in the close circuit).

Kindly suggest what could be the reason for oil going out from the compressor.

Gas -R404a

Regards