Boiler modulating control while keeping the thermostat relay output to turn on/off floor pump?
I currently have 6 wired thermostats controlling my underfloor heating installation. The thermostats switch their corresponding relay outputs, which are wired to the heating control panels on each floor of the house which, in addition to turn the boiler on / off, also control the start / stop of a floor circuit pump, which is totally independent from the boiler.
So far the system works perfectly with this on / off type control. The boiler is a Thermor Naema Micro 35, and I have just come to know it can perform modulating heating control with OpenTherm.
My question is whether, by acquiring the Extension Kit and connecting it to the boiler, I could carry out the modulating control of the boiler, instead of the current on / off control, but in such a way that the thermostats would continue to actuate their relay output so that they keep controlling the start / stop of the floor circulating pump, which as I said is independent from the boiler.
After having a look installers manual, it seems that for modulating control with OpenTherm the thermostats must be configured as option 'D01'. However, I understand that they should remain configured as 'R01' so they keep switching their volt-free relay to control the start / stop of the pump. But If so, I don't know whether they will send the signal to the Extension Kit to carry out the modulating control of the boiler.
Thank you very much in advance for your help