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I’ve noticed similar behaviour with a BDR91 and the latest firmware. I prebound my system prior to installation. The BDR91 controlling my towel radiator circuit was last to be installed. I saw no...

I had no issues with the HM80 and latest firmware but didn’t try to rebind it.

I think I see what you mean, with the latest firmware if you try to change the zone type the controller will remove...

I’ve got my new system up and running with my Vokera boiler and it looks like I was wrong, there is no distinction between CH and DHW demands coming from Evohome other than DHW is always max set...

In my new house, almost completed install, I’ve ditched the TMV and fitting a limit thermostat as a safety device.

Good stuff, look forward to hearing how you get on.

The manifold will of course be fed with water between the HM80 min and max set temperatures.

Must be old stock. Both of my new controllers had latest firmware pre-installed.

Yes, you could suppress the CS=10 and start a timer. Stop the timer if CS>10 sent, otherwise issue CS=10 after timeout.

I recall max modulation settings also change, so you might need to...

Happy New Year! It would be helpful if you can share a graph which includes the boiler flow temperature to see whether it is overshooting and anti-cycling.

Richard from the Evohome shop refers...

There’s no off the shelf solution for powering the room stats, you could probably wire them to a transformer.

Batteries should last a couple of years though so not too much hassle.

My heating engineer handled all of that.

Probably something like this:
https://www.navitron.org.uk/dn20-to-22mm-male-male-connector

And some soldered elbows/couplers.

Hi! You won’t need the BDR91. You can buy a Modulation Pack which includes the Evohome controller plus OpenTherm Gateway, rather than BDR91.

If you are using the controller as a zone stat you...

That looks as if it might do the trick. I guess you will need some compression adapter couplers.

In my previous house, with Intergas and my weather compensation setup running on the OGTW, I was able to disable weather compensation on an OpenTherm DHW demand.

You can also view the heating...

I think the problem is actually with Intergas here. Evohome does distinguish via OpenTherm messages between DHW and CH mode requests.

I don’t think there would be any point connecting the flow sensor as the HM80 won’t be able to correlate its (unconnected) rotary position to it. The HM80 can also operate without the flow sensor...

Maybe these?!

https://www.ibc.ie/wp-content/uploads/MVN_Datasheet.pdf

https://products.ecc.emea.honeywell.com/europe/ecatdata/pg_gr-vbg2.html

Yes, that’s correct and what we want to achieve. My point is if you could find a 2-port rotary/modulating valve, rather than 3/4-way, and were to replace your TMV you would face this issue and need...

You need an X-Plan setup:
https://www.intergasheating.co.uk/consumer/2019/11/05/tech-talk-3/

Basically this uses a BDR91 to short out a cylinder sensor NTC when DHW is off. When DHW is on, the...

It wouldn’t with your current setup but certainly in my case the motivation was to replace a thermostatic mixing valve/blender with an actuator controlled rotary valve. Is that not what you want to...

I’m assuming that’s a flow connection at the bottom, return at the right of the thermostatic valve and supply at the top. So you would junk your thermostatic valve for a 3-port: one port flow, one...

If you replaced your 3-way with a 2-way rotary valve your pump could dead head when the room is close to set point with the valve restricting boiler flow to the manifold. The same situation occurs...

I think that would only make sense if you could find a compatible 2-way rotary valve that the actuator could adjust to alter the flow temperature. But you would then need an auto bypass across your...

Yes, when the rotary valve is closed all flow is diverted to return.

I used a gate valve to restrict boiler flow to the UFH circuit. With a 4-way valve this is an injection setup with the UFH...

This is documented in the Evohome installation guide:
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The HM80 by default is used in district heating where a boiler demand is not required.

It works perfectly with this setup, I think...

1732

See attached. You don’t need an HM80 to see these, just add a mixer valve zone, quit binding and view the unbound zone parameters.