Variable Airfl Ow Operation (Vav) - S&P CADB/T-HE PRO-REG Series Instruction Manual

Advanced level
Occasionally, depending on the characteristics of the duct net (length and diameter) and also
depending on the regulating elements (type of dampers and opening / closing times), It may
be necessary to modify the Proportional and Integral bands of the fan speed control output.
To modify the proportional and integral bands, from the advanced parameters menu follow the
follwowing sequence:
1- Access to system level
2- Adjust the CAV parameters
9.3.2. Variable airfl ow operation (VAV)
Mode recommended in single area confi guration for variable airfl ow applications depending
on a signal type 0-10v.
The set point value depends on a signal 0-10 V coming from an outdoor probe (CO
ture, relative humidity, etc.) or a manual percentage. The ratio between the fans is entered in
the form of a discharge/supply percentage.
Functional parameter setting:
Access to the simplifi ed parameter setting menu (via the password 1111) allows:
• The selection of the usage range of the signal 0-10V (see example below).
• The variation range of the supply fan's speed.
• The percentage applied to the discharge with respect to the supply.
Manual/Auto
Se ngs
Configura on
Access Rights
Temperature control
Airflow control
Alarm se ngs
27
Airflow regula on
Change
P. Band: 1000.0Pa
parameters
Acc-I: 20.0 s
Min.output: 20%
Airflow regula on
Change
P. Band: 1000.0Pa
parameters
Acc-I: 20.0 s
Min.output: 20%
, tempera-
2