KNX PID control system on water
Water flow rate, the valve is closed or open Discharge temperature Room temperature
Comparative adjustable valves
THERMAL (time-proportional signal)
Valve can get a stationary position between 0 to 100%
Energy s saving
3 POINTS (V3000 PID signal)
A 3-point actuator ensures a valve management close to the control needs, by the control of its stationary position between 0 and 100% (control of the water flow rate). The blowing temperature of the comfort unit will be more stable, and the room temperature will get less variations (discomfort source). This temperature stability not only permits to maintain optimal comfort but also to save energy too. The electricity consumption of the 3-point actuator is null when thermal balance is found contrary to the thermal valve (Return on investment on energy saved: 2 to 3 years). The life span of a three-point motor is approximately 2 times higher than that of a thermic motor. To facilitate its servicing, the valve actuator is equipped with a plug-in connector.
Electric coil management
- 2-pipe/2-wire control algorithm (cooling + electrical heating or heating/cooling + electrical heating)
Heating / Cooling outlets
- If hot water is present, the electric heater operates as shown by (a). - If hot water is not present, the electric heater operates as shown by (b).
Outlet % temperature
0 120% 100% 80% 50% Xp TC TF 50% Xp 80% 100%
3 2 1
t Base = 4 mn
0 120% 100% 80% 50% 10% 0% 0% 10% 50% 80% 100%
tm t Base
The controller simultaneously adjusts: - Progressive opening or closing of the regulation valve, - Time-proportional operation of the electric heater (max. 2800 Watt direct), - The three fan speeds or the fan stop. Priority is given to operation at low speed (medium speed is activated if the valve opening is greater than 80%). In heating / cooling + electric heater configuration, the electric heater only acts as a complement. If there is no hot water, the electric heater is triggered as soon as heating is needed. Note: the algorithm above assumes that the ventilation speed selector is in the automatic position and that ventilation is stopped in the dead zone. It only shows the proportional aspect. In reality Proportional Integral Differential control is used. The variation of the duty cycle permits modulating the electrical energy and thus having an operation mode, similar to the one of a progressive valve. If the user selects low speed manually, the electrical heating duty cycle is limited to 50%. If the medium speed is selected, the duty cycle limit will be 80%. This limitation allows to prevent overheating of the comfort unit. The controller can limit the duty cycle in function of the outside temperature.
The V3000 control integrates in standard a timer, adjustable from 30mn to 24:00 (by step of 30mn). This function gives the user possibility to switch on the comfort unit when he enters in his office. In that case, the switch off will be automatic (e.g.: 4 hours to manage morning and afternoon periods).
HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 17.01 A