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What is you purpose?

With a Pump:ConstantSpeed you have the pump running even if there is no load on the loop and therefore the Chiller is Off. The Availability Manager Should be On. Be aware of the heat trafserred to the loop by the pump that could brings the temp loop over the max value and therefore causes a Fatal Error.

If you want to force the Chiller to stay Off even with a cooling load, you can use EMS forcing the Chiller branch flow to zero and all the flow to the by-pass (two parallel branches on the supply side sub-loop).