This module determines if the box should be in the heating flow reset (HFR) mode or the standard modes (non-HFR module). The State Table is set up to manage the HFR mode correctly along with the HFR output controller(s). This module generates the appropriate temperature control state for a VAV zone control application. This module monitors the status of the heating and cooling controllers and setpoints to determine whether the current state should be satisfied, unreliable, one of the stages of heating, or one of the stages of cooling. This module uses a heating flow reset strategy that increases flow when the maximum heating output is reached. For information on how the FSM determines the state, see FSM (Occupied Zone Sequencing [VAV] HFR).
This module also provides a quick transition from heating to cooling mode during major changes to space load conditions or setpoints (for example, a large group of people enter a space, or a schedule changes from unoccupied to occupied mode).