The Efficient Home Forum

Hi,

I've got Evohome setup as a Y-Plan, which means I've got 2x BDR91 for Central Heating & Hot Water (Connected Thermostat Pack and Hot Water Kit). Most of the radiators have got HR92s fitted and are setup as zones with their own schedules. Some of the radiators have manual valves and just steal heat if open.
I would now like to create an 'Others' zone. This zone however won't have HR92s or any actuators fitted. When on, this zone would only switch on the BDR91 for central heating and that's it.
All other zones would already be off and therefore have their HR92s closed, so the heat would only come out of the radiators with manual valves.
For this zone I'm happy to use the Evohome Controllers built in thermometer - I'm not using it in any of my HR92 zones.

Can anyone suggest how I should configure it?
On the Add Zone menu I'm not sure what to select out of Underfloor Heating / Radiator Valve / Mixing Valve / Zone Valve.

Thanks!

Not tried this myself but I think the following would work.
If you use the thermostat in the controller your dummy zone would turn on and off with the temperature it measured, if that is what you want it would just have to be set as a new zone and a new linked BDR91 box made to operate in parallel with the exiting CH BDR91

not sure that would work. A zone requires a device (eg an HR92). Yes, you can use the controller as the thermostat but you still need a device configured on the zone.
So, you could do this by binding an HR92 for your zone but not attaching it to a radiator

My reasoning is that as a zone can be defined by a room thermostat (I have two in my house using DTE92s) and in setup you can choose the controller thermostat to do just that, then that is the controlling device.

Create your 'other' zone using a HR92... evohome won't like what you are trying to achieve and may do some undesirable things with the demand relay, so just bear that in mind...

Hi Tregrill

Curious if you got your zombie zone working or not.

I'm looking to HR91 or HR92 every room except the bathroom which I'd hope to have run as both bypass and as its own zone using a remote thermostat.

I haven't done anything about it yet.

For now it's been okay throughout winter, as the towel rail just taps off some heat when any of the radiators is on.
But as we get towards spring/summer I imagine there will be times no HR92 is calling heat and hence there will be nothing in the heating loop for the towel rail to steal.

I'm thinking that I'll just stick a HR92 on the smallest radiator and give it a crazy schedule (e.g. 35C for half an hour in the morning/evening before going back to a sensible level). That way it will put some heat in the pipes for a short while, and then the valve will close before the room gets crazy hot. But any heat in the pipes will get to the towel rail.

I am looking to do the same - what did you do in the end??
Thanks
Andy

Why not add an HR92 to the towel rad?

Alternatively ...

If you have Y plan system, bind the HW relay as 'Hot water only valve' rather than than a '2 or 3 port valve'. This should select the mid position (CH & HW) when there is HW demand. As long as your HR92's are closed, you'll heat the HW & anything on the CH loop with an open valve. It's a bit of a convoluted fix though for a problem that's begging for nothing more than another HR92!

I am in exactly the same position
I got T87RF but cannot configure the zone with the temperature sensor alone.

The motivation is: I want heating to run twice a day around shower time to make bathroom nice and warm and towels dry.
However, I do not want to control the radiator as 1) this is a heat dump 2) I want it to get warm from time to time.

I guess I'd put a spare relay loose there. I could also put HR92 somewhere on the shelf or a pipe.
But I have already got the former.