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Hi, I use the heat exchanger object in EnergyPlus a lot and I don't put a setpoint:Scheduled on it ever. I do however need to make sure that the OA supply node is marked as an outdoorair node and often I will need a Setpoint:MixedAir Which will allow the outdoor air controller to understand what to do according to the temperature setpoints on the coils in the system. Have you tried the measure without putting a setpoint on and seeing what errors come out?