Primary States (Unoccupied Sequencing [AHU Mixed Air ZN-T]) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

Controller Tool Help
Product
Controls > Control Tools > Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
16.0
Revision date
2023-10-02

  • Satisfied: The temperature has returned within the limits defined by the unoccupied temperature setpoints.

  • Econ: The unit operates in a cooling mode with the economizer damper fully open until the temperature drops below the unoccupied cooling setpoint. If the temperature remains above the unoccupied cooling setpoint for a period of time, the system transitions to Econ+Mech.

  • Mech: The unit operates in a cooling mode with the economizer damper fully closed. Typically the cooling device operates at its limited max position until the temperature drops below the unoccupied cooling setpoint for a period of time. The system then transitions to Satisfied. If the Free Cooling Available input becomes True, the system transitions to Econ+Mech.

  • Econ+Mech: The unit operates in a cooling mode with the economizer damper fully open. Typically the cooling device operates at its limited max position until the temperature drops below the unoccupied cooling setpoint for a period of time. The system then transitions to Satisfied. If the Free Cooling Available input becomes False, the system transitions to Mech.

  • Preheat: The unit operates in a heating mode. Typically the preheat device operates at its limited max position until the temperature rises above the unoccupied heating setpoint for a period of time. The system then transitions to Satisfied. If the temperature remains below the unoccupied heating setpoint for a period of time the system transitions to Preheat+Reheat.

  • Preheat+Reheat: The unit operates in a heating mode. Typically the preheat and reheat devices operates at their limited max positions until the temperature rises above the unoccupied heating setpoint for a period of time. The system then transitions to Satisfied.

  • Idle: This state is active when the supply fan is starting and the temperature is greater than the unoccupied cooling setpoint. Once the Fan Ready input goes true, one of the cooling states become active.

  • Unocc Cntrl Not Req’d: The unit is not in an unoccupied mode or warmup or cooldown are active.

  • Temperature Unreliable: The monitored temperature is unreliable.