Delta Controls eZVP-440 User Manual

Sequences of Operations
Page 53 of 67
eZV-440 Version 2.1 Application Guide
Document Edition 2.5
Space demand
Box Mode
Airflow Setpoint
Airflow setpoint = AirflowDemand x (HeatingMaximum -
HeatingMinimum) + HeatingMinimum
Heating Demand
CoolCmd
or
AutoCool
(cold
air in the duct)
If there is a duct reheat stage and no series or parallel
fans, the damper is the last stage of heat.
As the Airflow Demand increases from 0 to 100%, the
airflow setpoint increases from the HeatingMinimum to the
HeatingMaximum setpoint.
Airflow setpoint = AirflowDemand x (HeatingMaximum -
HeatingMinimum) + HeatingMinimum
For fan-powered VAV boxes, the damper airflow setpoint is
maintained at the CoolingMinimum setpoint and the fan
provides any additional airflow for the duct heater.
Cooling Demand
HeatCmd
or
AutoHeat
(hot
air in the duct)
The damper has no cooling capacity as there is hot air in
the duct. The airflow setpoint is fixed at the
CoolingMinimum setpoint.
Airflow setpoint = CoolingMinimum
Cooling Demand
CoolCmd
or
AutoCool
(cold
air in the duct)
The damper is the first stage of cooling. As the Airflow
Demand increases from 0 to 100%, the airflow setpoint
increases from the CoolingMinimum to the
CoolingMaximum setpoint.

Delta Controls eZVP-440 Specifications

General

Brand	Delta Controls
Model	eZVP-440
Category	Controller
Language	English