Use this section to select the method of determining when free cooling is available.
Network Command adds a network input to indicate free cooling is available for the unit. The value of this input should be calculated elsewhere using the prescribed logic for your project.
Enthalpy Switch (BI) adds a binary input designed to be connected to a commercially available enthalpy switch. This type of sensor is typically supplied with package equipment or packaged economizer sections.
- Dry Bulb Temp Economizer enables free cooling when the outdoor air temperature drops below the economizer switchover setpoint (ECONSWO-SP).
- Temperature & Enthalpy Economizer uses the outdoor temperature and humidity and the return temperature and humidity to calculate the enthalpy difference of the two airstreams. It uses free cooling if there is less enthalpy in that air stream as long as the dry bulb temperature is below the economizer switchover setpoint (ECONSWO-SP).
- Outdoor Air versus Return Air compares the dry bulb temperature for the outdoor and return air to determine when free cooling is available.