Appendix A: Unit Vent Network Points List
Unit Ventilator
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Integration Guide
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26
Third party access to BACnet points in a controller
BACnet system points in the i-Vu® Open controllers match physical I/O points to data, such as
Outside Air Temp
,
to be written to the controller through the network, rather than by using a local hardwired sensor.
When a BACnet system point is written to, the controller uses the network value, even when there is a local
sensor, as long as it is within the Min/Max refresh times noted below.
BACnet writes to system points
The following table lists all of the writeable system points that could be present in an i-Vu® Open controller. The
list of points is application-specific, therefore not all points are present in all i-Vu® Open controllers. This
information applies whether the system point is being accessed by another i-Vu® Open controller or by a third
party system.
In the i-Vu® interface, select the controller in the navigation tree and go to
Properties
>
BACnet Objects
tab. When
an i-Vu® Open controller or a third party system writes to any of the system points, you must use
BACnet Priority
Level 16
and the value
must
not be written to or refreshed more than once per minute (60 seconds).
CAUTION
If any other
Priority Level
is used, the value will not be recognized by the controller.
BACnet System
Points Display
Name
Valid Range
BACnet/
Modbus
/N2 Default Value*
LonWorks
Default Value*
Recommended Write
Rrefresh
Time
(min/max)
System Space
Temperature
-50 – 150°F
-999
~180°F
1 min/5 min
System Space RH
1 – 100%
-999
-15.96
5 min / 10 min
System Space AQ
200 – 9999 ppm
-999
64537
5 min / 10 min
System OA
Temperature
-50 – 150°F
-999
~180°F
5 min / 60 min
[OA] Enthalpy
(BACnet)
High (0) / Low (1)
Low (1)
Low (1)
On change of state
System Outdoor AQ
200 – 9999 ppm
-999
-999
5 min / 60 min
System Water
Temperature
-50 – 150°F
-999
~180°F
5 min / 60 min
†System
Fire/Smoke
Inactive (0) / Active (1)
Inactive (0)
N/A
On change of state
†System
Pressurization
Inactive (0) / Active (1)
Inactive (0)
N/A
On change of state
Occupancy control
configuration
1 = Always Occupied
2 = BACnet Schedule (i-
1 = Always
Occupied
N/A
N/A
Appendix A: Unit Vent Network Points List
