BB (HT-bus) connected but boiler always heats up to the max without needing to
I have a few questions.
1) I have the Junkers ZWBR 30-3 and the old technician had connected two wires in BB (boiler side) which were expanding all the way to the middle of the house (living room) to the main FW-100. I have changed the FW100 with the wired tado thermostat and I did not pay attention to the polarity (if there is such a thing) of the BB cables. No matter how you connect them to the thermostat, as long as they are connected to the very right of the thermostat (+ and - sign as per here), the thermostat should properly be giving info/data back to the boiler, correct?
2) I ran the configuration twice. After the R01, I do not see D17, the thermostat jumps straight to HC01. Is that also normal?
3) Main and important question: The boiler, even if there is no need from the radiators, goes with the tado thermostat all the way up to 67°C (the setting is at position which translates to that temperature).... all the time. Is that normal? With the boiler's own FW100 in the living room, if there was no heating/hot water being needed, it would go down to 30°C (or less). Why does tado keep it all the way up to 70° all the time? This is a total waste of energy!
4) I wish for each smart radiator thermostat to be able to request for heat in the room it requests to do so. Do I have to say in the initial configuration ST instead of R01? Do I make each smart radiator thermostat as a primary one (and if so, how)?
5) In the app I cannot see any info from HT-Bus. It is as if it is analogical. Do you plan on enriching the info you get from bus? Or are these only provided with auto-assist?
P.S: All the radiators have their own smart radiator thermostat. I guess that in case one room needs more of a heating, then the other smart radiator thermostat stay closed and only the one in that room requests from the smart thermostat (linked to the boiler via HT-Bus) to heat up the boiler and circulate hot water (which will only be circulated to that room since all the rest are off. Correct?