topic Re: Wiring a Nest E to replace a Honeywell BDR91 UK in Nest Thermostats

Wiring a Nest E to replace a Honeywell BDR91 UK

vfrvulcan — Mon, 24 Oct 2022 20:02:10 GMT

Having seen the BDR91 was on the Google Nest compatibility list I ordered a Nest E.

Hit an issue when trying to wire it up which I can't resolve using the app.

Picture attached of current BDR91 wiring which goes to a British Gas BG330+ boiler

The app tells me to isolate Live and Neutral wires as they're not required due to the Heat Link being battery powered. However, connector A on the right, which I believe is Common, is bridged to the Live wire on the left.

Do I connect the A to C on the Nest as suggested, which in effect is simply connecting the Live wire?

Re: Wiring a Nest E to replace a Honeywell BDR91 UK

MrVacca — Mon, 24 Oct 2022 21:22:05 GMT

Hi @vfrvulcan - from what I understand, yes you will want to do that. I had to buy a power adapter but it appears yours won’t need that as long as you do what the app suggested. Keep us posted and good luck!

Re: Wiring a Nest E to replace a Honeywell BDR91 UK

EdwardT — Fri, 28 Oct 2022 00:37:33 GMT

Hi folks,

@MrVacca, thanks for the help!

@vfrvulcan, how's it going with your Nest Thermostat? Still need our help?

Thanks,

Edward

Re: Wiring a Nest E to replace a Honeywell BDR91 UK

Jake — Mon, 31 Oct 2022 18:52:25 GMT

Hey there,

I wanted to check in and see if you are still in need of any help with your device. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

Re: Wiring a Nest E to replace a Honeywell BDR91 UK

vfrvulcan — Mon, 31 Oct 2022 19:36:22 GMT

Now that I've had time to plumb it in over the weekend, happy to report its working fine, thanks for your help.

Re: Wiring a Nest E to replace a Honeywell BDR91 UK

Jake — Tue, 01 Nov 2022 17:04:35 GMT

Hey vfrvulcan,

I am glad to hear that everything is working. I am going to keep the thread open for a couple of days, in case you have any questions from here. Please feel free to let me know.

Best regards,

Jake

Re: Wiring a Nest E to replace a Honeywell BDR91 UK

Jake — Fri, 04 Nov 2022 16:22:54 GMT

Hey vfrvulcan,

I wanted to check in, and let you know that I will be locking the thread in 24 hours.

Best regards,

Jake

Re: Wiring a Nest E to replace a Honeywell BDR91 UK

vfrvulcan — Sat, 05 Nov 2022 02:16:18 GMT

Thanks for the heads-up Jake,

Just seem to have one issue outstanding. In the (minimal) manual it suggests that whenever the Nest in calling for heat then the Icon will be illuminated on the Heat Link - I don't see this.

In other words, when I walk past the Heat Link there is no indication whether it is active or not.