HR91s - what do they activate?

[sideshow_bob]

Hi

Question on HR91s/HR92s - what do they activate? Any BDR91s set up as a zoned heating valves? Or the BDR91 set as appliance relay? Or something else? I don't want the ufh zones (behind a zoned BDR91) turning on if a single HR91 somewhere calls for heat.


Thanks

[Richard]

Any HR91 or HR92 demand will activate a 'heating valve relay' and 'appliance relay' depending how the system is configured.