Dual enthalpy changeover - Johnson Controls - LIT-12011950 - Building automation software - Smart Equipment Controller - 5.0

Smart Equipment Controls Sequence of Operation Technical Bulletin

Brand
Johnson Controls
Product name
Smart Equipment Controller
Document type
Technical Bulletin
Document number
LIT-12011950
Version
5.0
Revision date
2024-06-06
Product status
Active
Language
English

This section applies when free cooling current mode is dual enthalpy.

For dual enthalpy economizer operation, the outdoor air enthalpy must be lower than the return air enthalpy by 1 BTU/lb and the operational outdoor air temperature is less than the outdoor air temp enable setpoint (EconOAT-SpEn).

Free cooling is no longer available if the operational outdoor air temperature rises above the outdoor air temp enable setpoint (EconOAT-SpEn) or the outdoor air enthalpy rises above the economizer outside air enthalpy setpoint.