028-0506-02_II-VZ8250_EN www.viconics.com
January 2020
15
VZ8250
[
Installation Guide
]
10. BALANCING
During balancing, a technician will install a calibrated flow sensor (Balometer) over the outlet in each room and use this to calibrate the
VZ8250:
•
Pressure Independent
:
True air flow will be measured and compared to the airflow calculated by the VZ8250 at various setpoints.
VZ8250 calibration parameters will be adjusted by the technician to ensure the calculated air flow matches the true air flow.
•
Pressure Dependent
:
True air flow at various damper percentages will be measured and used to set the appropriate damper percentages for the
air flow required for the zone.
Flow sensor
(
PI only
)
Damper
Calibrated
Flow Sensor
(Balometer)
NOTE
: Balancing menus will timeout after 8 hours and any Damper Override will be removed, returning the zone to normal operation.
10.1 PRESSURE INDEPENDENT
Before starting to Balance the system, check the following parameters are correctly configured in the Configuration menu:
•
VAV Box Type
•
Flow at 1-inch water column
•
Airflow Sensor Pressure Range
•
Actuator Type
•
Floating Actuator Time
Airflow Balancing settings can be found on the Balancing page of the Setup menu.