the on/off cycle could do it very precisely, other thermostats prove that. It's just that it needs to skip cycles when more heat isn't needed.
The TRV can try to throttle back by partly closing, but when you're heating just 1 room (all other TRV's closed), all the water will still go through the radiator(s) in that room, unless the TRV actually fully closes...
if multiple zones are asking for heat, the controller calculates a accumulated percentage that it sends to the BDR91. The TRV's will try to get more hot water into the more demanding zones by partly closing the not-so-much demanding zones and eventually fully close.
When using multiple zones however, it's much less likely that the temperature in a room will rise with just 1 minute of heat per 10 minutes... so the regulation will probably be fine in that case.
The TRV can try to throttle back by partly closing, but when you're heating just 1 room (all other TRV's closed), all the water will still go through the radiator(s) in that room, unless the TRV actually fully closes...
if multiple zones are asking for heat, the controller calculates a accumulated percentage that it sends to the BDR91. The TRV's will try to get more hot water into the more demanding zones by partly closing the not-so-much demanding zones and eventually fully close.
When using multiple zones however, it's much less likely that the temperature in a room will rise with just 1 minute of heat per 10 minutes... so the regulation will probably be fine in that case.
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