028-0506-02_II-VZ8250_EN www.viconics.com
January 2020
19
VZ8250
[
Installation Guide
]
10.2 PRESSURE DEPENDENT
Before starting to Balance the system, check the following parameters are correctly configured in the Configuration menu:
•
VAV Box Type
•
Actuator Type
•
Floating Actuator Time
Air Flow Balancing settings can be found on the Balancing page of the Setup menu.
The recommended process for Balancing the system is:
1. On page “Balancing (PD)”, set the approximate damper positions for Minimum, Maximum Cooling, Maximum Heating, Maximum
Reheat.
2. For each position, repeat the following process:
a. Set the Damper Override to the desired position (Minimum, Maximum Cooling, Maximum Heating or Maximum Reheat).
b. Allow time for damper to reach defined position.
c. Take reading of actual air flow using a calibrated Balometer.
d. Compare actual airflow to desired airflow and adjust the Damper Position accordingly.
e. Repeat until measured airflow at the damper position matches the desired airflow.
3. On page “Balancing (PD)”,”, revert the Damper Override to None to allow the system to return to normal operation.
BALANCING OPTIONS
Min. position
Balancing
100 %
30 %
Reheat pos.
100 %
Max. heat pos.
None
Damp. override
10 %
Max. cool pos.
Pressure Independent
Configuration parameter
BACnet
Function description
Minimum Position
AV250 (R/W)
Minimum damper position:
•
Units = %
•
Min = 0
•
Max = 100
Maximum Cooling Position
AV251 (R/W)
Maximum damper position during cooling:
•
Units = %
•
Min = 0
•
Max = 100