eZV-440 Version 2.1 Application Guide
Page 20 of 67
Document Edition 2.5
Global Settings
This section describes the fields found in the Global Settings section.
Field name
Description
Application Type
Select the main HVAC system application for this controller. This determines the
algorithm that will be used for the controller.
The options for the eZV-440 are VAV-single duct, VVT and None. The configurable
controller has no functional state until you select an algorithm.
In a fully programmable controller, when you select an algorithm, you can override
portions of the internal algorithm to suit your needs. See the
overwriting the algorithm. Select None if you want to program a fully custom sequence
of operations. When you select None, the internal algorithms are disabled and all
preconfigured algorithm I/O points and variables are removed from the default database.
Other object types, like AIC, that were part of the algorithm can be used as is or
reconfigured.
If you change from one application type to another, the settings of the previous
application will be deleted. You can save your controller database before switching
application types.
Temperature Units
Displays the temperature units used by the eZV-440 controller. Select between Celsius
and Fahrenheit.
Airflow Units
Displays the airflow units used by the eZV-440 controller. Select between CFM, l/s or
m
3
/h.
Parent Child Address
If this controller reports to a parent controller, enter the parent’s BACnet address in this
field. In all other cases, including setting up a parent controller, leave this field at its
default zero value.
If the parent’s BACnet address changes in the future, you must manually update
this value to match the new address.
The child controller polls these variables from its parent controller:
HeatCoolLoad (AV802)
OccupancyMode (MV800)
DemandCtrlVent (AV813)
In the configuration graphic, when VVT is selected as the application type, the units are set to
percentages which represent the damper min/max positions. When VAV is selected as the
application type, the AV124 to AV127 objects and the air flow setpoint will use the units set up in
the Airflow Units field.