I have a heating system configured with s plan wiring. There are two zones and one pressurised hot water cylinder. The are three 2 port motorised valves. 2 for the tow heating zones and one for the hot water cylinder. When the programmer calls for heat and the respective cylinder or room thermostat calls for heat the relevant valve is actuated and opens thus closing the internal microswitch this then starts the boiler. At this time all three 2 port valve microswitches are in parallel meaning that there is only one signal wire pair to the boiler. I have a Vaillant Ecotech 466 boiler. The manual can be found here: https://www.vaillant.co.uk/downloads/z/ecotec/ecotec46kinstallationmanual-933722.pdf
When any of the valves are open and hence the microswitch is closed 240v AC is applies to the RT pin on the boiler - the 240v coming from the boiler. Essentially pins 3 and 4 on the violet connecter as shown on page 23 of the manual and the boiler starts in heating mode.
The boiler has the option to set the water temperature for the heating and hot water to different values but as the boiler is currently wired the boiler does not know what is being called for so only the heating temp control is used.
Can someone tell me which connections I should use on the boiler to be able to call for hot water or heating as separate signals so that I can control these two temperatures separately
When any of the valves are open and hence the microswitch is closed 240v AC is applies to the RT pin on the boiler - the 240v coming from the boiler. Essentially pins 3 and 4 on the violet connecter as shown on page 23 of the manual and the boiler starts in heating mode.
The boiler has the option to set the water temperature for the heating and hot water to different values but as the boiler is currently wired the boiler does not know what is being called for so only the heating temp control is used.
Can someone tell me which connections I should use on the boiler to be able to call for hot water or heating as separate signals so that I can control these two temperatures separately