Sequences of Operations
Page 47 of 67
eZV-440 Version 2.1 Application Guide
Document Edition 2.5
Sequences of Operations
The enteliZONE internal algorithm supports pressure independent (VAV) and dependent (VVT)
variable air volume applications. This section describes the operational sequences in the
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).