Evohome Wiring Issue

1 Jul 2007
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United Kingdom
Hi, just invested in an evohome to try and gradually piece together our heath robinson CH system that has been added to over the years.

We have a main system (I'll call it the legacy system) with 7 rads upstairs and a thermaskirt system down. This was running off a wireless Honeywell controller to a BDR91 - so I have simply swapped the front of the BDR 91 and plugged the evohome main station in and was working within 5 minutes.... that's the easy bit!

I also have 2 single zone UFH kits- one in the kitchen (forget that one for now)...

And one in the utility room, which serves both the utility and study. I have the pump and actuator under the countertop, with a small wiring centre which has 4 cables. 1 goes to the pump, 1 to the actuator, 1 is a 3 core and earth - think this goes back to the main wiring centre upstairs where there is a zone valve. The programmer/stat is in the study, on the end of a 4 core flex, but only using the black and brown wires. The other end of what I thought was the cable to the programmer has 3 wires terminated- including the blue, so I've concluded the end of the programmer must be elsewhere.

I've bought a T87RF2033 Single Zone Thermostat to replace this and to hook in to evohome as a new zone. Looking at the wiring, I cant work out where I should be putting the new BDR91. I presumed I could put it near the UFH actuator / pump, but the wiring has thrown me. Any tips for working out what is what?
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