Do we have some expert in replacing compressors

[Zahid]

Gents, Hi

We have four chilers DUNHAM-BUSH Model # ACFX280-6 capacity 275 TR Flooded cooler with hermetically sealed Rotary screw compressors (120TR & 155 TR) two sytems and CHW EWT 44F LWT 54F ambient 115F.

And we have a total of failed compressors SIX out of Eight in last four years period. and we are now serious in replacing all the compressors to servicable Reciprocating type either York or copeland type. can any expert suggest on the following.



P& ID piping flow diagram attached for your quick review also you can download cataloge from DUMHAM-BUSH site for the model sepecified above.

1. Piping modification if required for economizer.
2. Compressors capacity selection, suggetion, advice.
3. Can we have mulitle compressors in parallel to meet the capacity of each systems.
4. Controls modification if any for loading & unlading.
5. Exsiting Motorized ball valve operation for economizer operation.
6. Liquid & suction injection to the new compressors modification if required.
7. Oil retun to the compressors.
8. Microprocessors alteration if any.
9. And finally how this chillers will work on new compressors is it ok to replace the compressors with Reciprocating type servicable.
10. Your advice for the above will be highly appreciated.

Thanks for your suggetion in advance. and I now look forward to recive your valued replies. on

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Regards

Zahid

P & I D Flow Diagram.pdf
P & I D Flow Diagram.pdf