Chiller Isolating?
Ive seen valves on condenser water for some screw chillers that need to get the pressure up quickly to move oil...but never really seen isolating on chw.
Youre controlling leaving water right? if LVG-T isnt down to setpoint, then start another chiller. wait-open valves-wait-start pump-wait-start chiller.
I suggest staging chillers off based on RET-T (inside the bypass/balance loop) as the bypass opens, the return water temp starts to drop (or flow in the bypass/balance line increases) or when the flow equals one CHW Pump worth, then you dont need the chiller....shutdown. Stop chiller-Stop Pump-close valves.
1 + 1 = 3 ( *** for very large values of 1)
...everybody wants a box of chocolates and long stemmed rose
Be brave. You cannot get eaten by an imaginary tiger.