V3000 KNX PID electronic water control, 3-point, networked KNX Keyadvantages Modulating valve comparison Water flow rate Supply air Room the valve is either temperature temperature THERMAL open or closed (Time-proportional signal) The valve retains Supply air Room any position from 0 temperature temperature to 100 % 3-POINT (V3000 PID signal) ■ A 3-point motor enables a valve to be to actuated as close as possible to the control system requirements, by controlling its position between 0 and 100 % (water flow control). The terminal unit supply air temperature is more stable and the room temperature varies very little (variations cause discomfort). ■ This temperature stability not only ensures optimal comfort, it also allows energy savings to be made. ■ The 3-point motor uses no electricity when the thermal balance is struck, unlike the thermal actuator (return on investment on the energy savings made: 2 - 3 years). ■ The service life of a 3-point motor is approximately twice as long as a thermal actuator. ■ To facilitate its maintenance, the motor is equipped with a plug connector. Electric heater management - 2-tube 2-wire control algorithm (application: cooling + electrics or heating/cooling + electrics). Heating/cooling outlet 100% - Presence of hot water, operation of the electric heater as per (a). 80% - Absence of hot water, operation of the electric heater as per (b). Valve Valve electrics (b) 50% (a) Temperature 0 % out 120% 100% 80% 50% DeadbandTC TF 50% 80% 100% Xp Xp Speed3 tBase = 4 mn 2 1 % out 0 tm 120% 100% 80% 50% 10%0% 0% 10% 50% 80% 100% Duty cycle: RC tBase The controller acts simultaneously on: - The gradual opening or closing of the control valve, - The electric heater operating in time-proportional mode, - The 3 fan speeds or switching the fan off. Priority is given to low-speed operation (medium speed activated from 80 % valve opening). For heating/cooling + electric heater, priority is given to heating the hot water; the electric heater is only activated as an additional measure. If there is no hot water, the electric heater is triggered when there is a heating requirement. Note: the above algorithm supposes that the fan speed is selected automatically and that the ventilation is off in the deadband. It does not demonstrate the proportional characteristic. In reality, the control is Proportional-Integral-Derivative. The variation in the duty cycle enables the electrical energy to be modulated thereby enabling a similar function to that of a progressive valve. If the user manually selects low speed, the duty cycle will be limited to 50 %. If the user selects medium speed, the duty cycle will be limited to 80 %. This limitation prevents overheating in the terminal unit. The controller can limit the dutycycle based on the outdoor temperature. Timer The V3000 control integrates a timer,as standard,which can be set from 30 mins to 24 hours (in 30-min increments). This function enables the user to manually start the room air conditioning as he or she enters. It will switch off automatically (e.g.: after four hours for morning and evening time slots). 122 122 CATALOGUE 2021 sEanveinrggy s