User configuration settings - Johnson Controls - LIT-12014272 - Valve - Venturi Valve

Venturi Air Valve with UVM1000 Installation Guide

Product name
Venturi Valve
Document type
Installation Guide
Document number
LIT-12014272
Revision date
2023-03-10

The CFM/Press at 10 V field sets the control signal and feedback signal scale in and out of the UVM. If the UVM is configured to operate with a Venturi valve, this value represents what CFM the 10 V input and output signals represent.

For example, if you enter a value of 1500 CFM, a 10 V signal applied to the IN connection requests 1500 CFM, and a 10 V signal from the Vo connection indicates that the valve provides 1500 CFM. This value is set initially by the factory and is matched to the size of the valve attached to the UVM. For more information on the typical values, see Table 1

The FB input filter factor is a filtering or dampening factor applied to the raw feedback signal from the position feedback sensor on the valve. The typical value is 3.

The SP input filter factor is a filtering or dampening factor applied to the raw control signal applied to the IN connection of the UVM. Some third-party controllers use a PWM method to produce their AO signals. This method typically results in a signal that varies by up to 0.5 V at 10 KHz. The UVM is sensitive to this signal and results in an actuator that moves between various positions as it follows the moving input control signal. This value is typically 10 to 20 but can be 50 or more for third party controllers with unsteady AO signals.
Note: The higher this value, the less responsive the UVM is to sudden changes in the control signal.