Question about centrifugal compressors

Dear Friends,

Would you please let me know what is the meaning of this sentence ?
"All refrigeration compressors except centrifugal compressors contain oil"

At centrifugal compressor we do not use oil ?

Sincerely yours.

Generally the motor is external to the compressor and the shaft bearings are also outside of the refrigerant circuit.

There is a lubrication system but it is <within><correction - outside> the refrigerant circuit.

Download the manual for a Carrier 19XRV chiller and look at the lubrication diagram, it will be helpful.

http://eto.carrier.com/litterature/i...OM_19XR_LR.pdf

Quote:

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Originally Posted by Brian_UK

Generally the motor is external to the compressor and the shaft bearings are also outside of the refrigerant circuit.

There is a lubrication system but it is within the refrigerant circuit.

Download the manual for a Carrier 19XRV chiller and look at the lubrication diagram, it will be helpful.

http://eto.carrier.com/litterature/i...OM_19XR_LR.pdf

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Thanks a lot Brian_UK.