Ys chiller No oil return

[jaxhd1]

I have four 300 ton ys s2 york chillers,I got the oil results back and #2 and #3 chiller needed an oil change.So we changed the oil in #2 and it ran for 24 hours and it seemed to be ok so we did the oil change in #3 chiller,then on Saturday the weekend crew said #2 shut down on low seperator oil,when I came in it looked like there was enough oil in the sump so I started it back up and it ran for about 15 min and shut down on low oil.So we checked out the Eductors and they were ok we had already changed the eductor filters so we ruled that out.
Whats really got me stumped is that I started up chiller 3 today and it is doing the same thing that #2 is. Both chillers were running fine before oil change and now are having the same problem.
Like I said they are york ys -s2 chillers and the book I have says to use 10 gallons of York type C oil.
Am I missing something?
any thoughts?
Thanks

[henpeck]

What is you entering Condenser temps been running?


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[henpeck]

Condenser water temps getting too low can cause you problems.


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[henpeck]

Make sure condenser water temps are right, and tower fans operating properly


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[servicetrane]

low partial load, condenser water temperature low, low water flow

[jaxhd1]

I have tried setting my tower fans at different speeds and it does the same thing if the CT water is 75 or 95,With a higher head press the oil does return but it leaves almost as fast
I did notice that my discharge temp is low about 15 DSH and my slide valve never got farther than 40% and the water setpoint is 45 and it never got lower than 47

[henpeck]

Check your flows, odd that it's happening to
Most of them. Must be WD? Chill wtr and condenser wtr make sure they have the bldg aud . Did you say you are having to run tower fans manually?


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[henpeck]

Sorry I can't do more than one thing at a time. Verify proper chill wtr flow. Make sure they have there controls working properly


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[jaxhd1]

I don't have to run fans on Man. I just did to get temp up

What I can't keep asking is why they ran fine before oil change and now shutting down.nothing else was done???

[henpeck]

That you know of, did you verify oil charge plus how much did you remove from each ch


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[servicetrane]

oil charge for these machines is 10 gallons. that version is the machine?

[york56]

What refrigerant is the Chiller using ? Because some are R22 and some are R134a

[york56]

Reason I ask R22 takes C-oil and R134a takes K-oil just thought I would ask this stupid question.