Hi all, I encountered a problem whereby the CHWS temperature increased out of a sudden from 7.5C to almost 16C. Because we set the CHWS setpoint as 12C where the chiller will start to cut-in, so now 4 chillers are running intermittently when typically, only 1 would run. This is the second time this has occurred within a month, never had this issue previously.
We can definitely rule out faulty temperature sensor as the CHWR temperature also increased. All AHUs running normally.
Question: What would cause the CHWS temperature to increase suddenly? Why would the chillers run, but is still unable to bring down the CHWS temperature back to set point?
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