Chiller chilled water supply temperature does not meet set point when the heat exchanger (HeatExchanger:FluidToFluid) is not in operation. In fact it appears to be influenced by the heat exchanger nominal capacity even though it is not operating: [Chiller supply CHW temp] = [setpoint temp] + [dT that HX can provide]
Not sure why it controls this way. There is still capacity in the chiller and condenser loop to meet set point, and even a lower setpoint - so don't believe it is a chiller or cooling tower size issue.
Using Design Builder / Energy Plus.
