Delta Controls eZFC-424R4-24, Application Manual

Page: 56 / 85

eZFC-424R4-24 Application Guide
Edition 2.6 Page 55 of 84
enteliZONE Sequence of Operations
Introduction
This section describes the control sequences in the enteliZONE controller algorithm.
Setpoint Control
The controller determines heating and cooling modes by comparing the space temperature to the
CurrentHeatSetpoint (AV800) and the CurrentCoolSetpoint (AV801).
The active space temperature setpoint (AV829) displays the setpoint that is currently operating. In
heating mode, the active setpoint will display the heating setpoint, and in cooling mode the active
setpoint will display the cooling setpoint.
When there is no call for heating or cooling, the controller is in deadband mode. In deadband mode
(between unoccupied heating and cooling setpoints), the active setpoint displays the current space
temperature.
Setpoint Range Limits
The heating setpoint can never be higher than its corresponding cooling setpoint. If one setpoint is
adjusted, the other setpoints will dynamically adjust to maintain their relative positions (see above
diagram). Eco mode and standby setbacks also are limited to the range between unoccupied
heating and cooling setpoints.
The absolute minimum value for all occupied and unoccupied setpoints is 10°C (50°F). The
absolute maximum value is 30°C (86°F).