On Yorks the lowest you can run condenser water is 15 degrees above leaving chilled water setpoint. Anything below that the oil usually doesn't come back, especially at part load.
Edit: auto correct wreaks havoc on anything technical I try to post from my phone.
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Not true, but if you want to run at 15*F above CHW setpoint that's fine. I've had chillers running with condenser water as low as 10*F above leaving CHW temperature. Oil return is generally not a problem with York chillers and it improves as the PRV go toward closed. The only problem I experienced running cold condenser water temperatures was a slightly elevated oil temperature because there wasn't enough differential pressure to feed the oil cooler properly.
Originally Posted by Random1634
15 above was always what I was told to go for from the factory , most likely because of those oil temp issues you mentioned. I never really pushed it but obviously it can be done as seen in the OP's picture. The only time I really see oil problems on Yorks are when they stay unloaded.