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BAS-SVN208G-EN
Step 13: System Controller Setup
Figure 11.
Create VAS
6. Under
Functions
, define the number of normal and strong opposite callers required
for the system to changeover. Define the minimum changeover time or use the
default.
7. Choose the device controlling the bypass damper, such as the UC210 with Bypass
Damper Control programming.
Note:
To set the bypass configuration, an Air Handler member must be defined.
8. Set the Discharge Temperature limits and deadbands.
9. If the Air Handler does not have a Discharge Air Temperature (DAT) sensor, do the
following:
• For the VAVs, provide a source temperature from elsewhere in the system.
Reference a value from elsewhere in the system to the source temperature of the
VAV members.
Figure 12.
VAS setup - Source temperature reference
• For the Air Handler, manually set the DAT of the Air Handler to a reasonable value,
even if the point is out of service Note that the Discharge Air Temperature (DAT) of
the Air Handler has an effect on the VAS system based on the DAT High and Low
Limit definition. Using Reliatel controls as an example, when there is no DAT sensor,
the BCI-R will set the value for DAT to “65,535” and put the point out of service. When
the point is out of service, it's no longer “in fault” and therefore VAS uses the value
for the sequence. Because 65,535 is greater than the DAT High Limit, VAS puts the
unit in Fan Only mode. To avoid this issue when there is no DAT sensor, leave the
DAT point out of service and set it to a value within the limit range so that the system
will operate correctly.
Schedules
• Tracer Concierge only supports System Controller schedules that are type: HVAC
and Binary. Analog and multi-state schedules will not appear on the Tracer 10-inch
Display.
• Schedule names will appear on the Tracer 10-inch Display, so name schedules
suitably.Best practices for schedule names:
•
Name schedules with 24 characters or less.
•
End the name with the word
Schedule
. For example, Store Schedule or Parking
Lot Lights Schedule.
Note:
Schedule names longer than 24 characters will wrap and then end in ellipsis for
longer names.
• Schedule members should be areas, such as lighting and/or HVAC areas or spaces
such as constant volume rooftop units.
