Hi All,

I'm currently working on a model that has CO2 sensing in a few large high occupancy spaces. When I select DCV Return Sensor with a minimum OA sizing method of 'Sum of Zone OA', it drives up the energy consumption of my electric centrifugal open chillers during the winter months (this is in climate zone 5A). But without the DCV Return Sensor, there is no space cooling energy consumption during the winter months. It appears as if the DCV Return Sensor is overriding the Enthalpy Economizer with a drybulb high limit of 70F. Does anyone have any insight into what is happening?

Thank You,

Janne Kairento, E.I.T., LEED AP