Four types of free cooling selection (FreeClg-Sel) options are available: dry bulb temperature, single enthalpy, dual enthalpy, differential dry bulb, and auto.
Setpoints and related data
The setpoints are related data include the following items:
Note: All the setpoints are free cooling setpoints.
- Economizer free cooling type (FreeClg-Sel)
- Free cooling current mode (FreeClg-Mode)
- All compressors OFF in free cooling (AllCompOff-Econ)
- Economizer outdoor air temperature enable setpoint (EconOAT-SpEn)
- Economizer outdoor air enthalpy setpoint (EconOAEnth-Sp)
- VAV cooling supply air temperature upper setpoint (SATUp-Sp)
- VAV cooling supply air temperature lower setpoint (SATLo-Sp)
- Outdoor air enthalpy (OA-Enth)
- Return air enthalpy (RA-Enth)
Inputs
The inputs include the following items:
- Operational outdoor air temperature (OprOAT)
- Operation outdoor air humidity (OprOAH)
- Supply air temperature sensor (SAT)
- Return air temperature (RAT)
- Operational space humidity (OprSH)