Smart Valves are programmed to optimise the operation of the system by opening the hydraulic valve proportionally according to the detected temperature.
The anti-whistle percentage is designed for those cases where, when the hydraulic valve is closed and gradually starts to open, a 'whistle-like' noise may be heard (caused by the pressure of the water passing through the hydraulic valve). To avoid this, as the anti-whistle percentage increases, the minimum opening percentage of the Smart Valve increases, reducing the 'whistle'.
Example 1: If the room setpoint is set to 21.0°C and the Smart Valve detects a temperature of 19.5°C, this causes the hydraulic valve to open proportionally. With the same setpoint, but a temperature detected by the Smart Valve of 15.0°C, then the opening will be higher, even 100%, and then progressively reduce the opening percentage as the setpoint temperature is approached.
Example 2: By setting the anti-whistle percentage to 100%, the Smart Valve will open the hydraulic valve at 100%, resulting in a switch from a modulation system to an ON/OFF system (all open or all closed) and thus breaking the optimisation concept.