I don't suppose you have a picture of the CS92A connected to the temp probe?
I don't suppose you have a picture of the CS92A connected to the temp probe?
Not off hand no, however here is one from google:
The CS92A is on the left. On the right is the strap on sensor for vented cylinders but the kit also comes with a probe style insertion pocket sensor for unvented cylinders. The sensors both have about 60cm of cable built in to connect to the CS92A but as mentioned you can extend that if needed.
Last edited by DBMandrake; 5th February 2017 at 06:04 PM.
Ah, so having purchased the Evo Home Shop Connected Value Pack A, I should have 2 x BDR91s and a CS92A? One BDR91 is for the boiler and the other is for the CS92A?
You're getting confused. The CS92A and the BDR are totally unrelated. The BDR is a relay used for controlling things, like zone valves, boilers, etc. The CS92A is a wireless transmitter that sends the temperature of your hot water to the controller.
Evohome assumes you need one BDR91 for the HW and the other to fire the Boiler as a Boiler Relay. If you have a true S plan then you will land up with 3 BDR91s. One for HW, one for CH and one for Boiler. Ofcourse you could choose to use an OT bridge instead of a Boiler Relay and then have the two BDR control the HW and CH valves only.
No it doesn't - the most common S-Plan configuration with Evohome has two BDR91's - one for the HW zone valve and one for the CH zone valve. The boiler is fired using the orange wires of both zones valves not directly, so there is no boiler relay in this configuration.
If you only have a hot water zone valve and no heating zone valve (in which case it's not really an S-Plan or Y-Plan system) then yes you can configure the two BDR91's as hot water zone valve and boiler relay instead, and let the HR92's prevent heating during hot water demand, provided all radiators have HR92's.
This three relay configuration is a second option for S-Plan/Y-Plan - and is the one I use. It's more complicated but it does give some additional flexibility over firing the boiler from the zone valves or not having a heating zone valve.If you have a true S plan then you will land up with 3 BDR91s. One for HW, one for CH and one for Boiler.
Last edited by DBMandrake; 5th February 2017 at 09:56 PM.
The reason I said Evohome assumes one BDR to work the HW and one to fire the boiler is because that's how it comes configured in the box. To use the Boiler relay to work the CH valve instead you need to unbind it as the Boiler relay and rebind it as the CH zone valve relay.
Evohome expects all your radiators to have HR92s with no separate CH zone valve.