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I've had success using separate unitary systems set to control to setpoint for each WaterToAirHeatPumpcoil. I put all other components (fan, supplemental coil, etc.) just in the air loop itself and it seems to work okay. Although now you're going to cause me to go back and double check it's working as I expected. 3 air loop 40 TZ model at 4 timesteps/hr solves in <10 minutes.

I've had success using separate unitary systems set to control to setpoint for each WaterToAirHeatPump coil. I put all other components (fan, supplemental coil, etc.) just in the air loop itself and it seems to work okay. Although now you're going to cause me to go back and double check it's working as I expected. 3 air loop 40 TZ model at 4 timesteps/hr solves in <10 minutes.