HR92 with BDR91

[Yorkie]

Hi folks, trying to find the answer to this question but so far no luck!

I have an Evohome system running well with 12 HR92's and BDR91 as the boiler relay in an S-Plan setup. Now here's the challenge....! In my kitchen i have one radiator and it's controlled with an HR92. I also have a hydroponic plinth heater that comes on automatically when the CH water is hot. This is all well and good except that the plinth heater runs whenever the CH water is hot so i'm thinking can i set up another BDR91 to run as a slave relay to switch on/off the plinth heater fan when the Kitchen HR92 calls for heat? I can't see how this is programmed in the Evohome controller.

Has anyone done this yet?

Thanks!

[Richard]

Just use a HR91, fitted to a straight TRV valve on the plinth heater bound as a second radiator controller for the zone.