KEL 125 electrically controlled air valve

Information

Electric metal plate valve designed for air discharge (supply), with adjustable centre element for flow control. The valves are made of steel plate coated with white paint (RAL 9010). The mounting frames are made of galvanized sheet metal and the sealing to the frame is secured with elastic tape.

- electric control 12V AC/DC
- protection IP 20
- ideal for DCV systems (ventilation controlled by actual need)
- suitable for renovation of prefabricated houses without the need to interfere with the HVAC distribution system
- min. flow rate by turning the disc
- low noise and crosstalk values
- ambient temperature up to 100 ˚C

Installation
Valves are inserted into the mounting frame included in the delivery. The mounting frame is used to fix the valve to a ceiling structure, wall or circular pipe. By rotating the centre disc, the minimum continuous flow rate of the closed valve can be adjusted.

Electrically operated valves are not equipped with a timer. A suitable timer should be added according to the number of valves with regard to their power (approx. 4 W). If one single valve is to be connected, only a safety transformer with an 8 minute time switch CTE 12/708 can be used for power supply. The maximum number of valves is limited by the switching current of the time switches.

Application
KEL electrically operated metal plate valves are suitable for DCV (demand controlled ventilation) systems. The systems operate on the principle of controlling to a constant pressure in the riser pipe. The plate valves can be controlled manually by switches, CO2 sensors, hygrostats or programmable weekly switching clocks.

Functions
When the lights are turned on in the bathroom or toilet, the plate valve opens and the pressure in the pipework drops. The differential pressure sensor of the CTB and CRxB Ecowatt fans with control electronics will increase the speed to adjust to the previous pressure value.

Measurement and Control
The air flow control is performed by rotating the center disc to vary the valve opening "s" (mm). Air flow measurement is performed as a pressure differential measurement using a measuring tube. See diagrams for further details.

Note
In the closed state of the disc valve, the temperature of the linear actuator can reach up to 70 °C, therefore installation only in spirotubes or fittings with free flowing air is possible. The valve must not be used in flammable air ducts without air flow.