Worcester Bosch Greenstar R35 thermostat wiring

mthorniley · 18 Feb 2016

I have just moved into a new house that has a Worcester Bosch Greenstar R35 combi boiler.

There is no thermostat at present and I wanted to wire in my British Gas Hive

The boiler manual and hive manual state that only the Worcester TR2 can be used on this boiler.

Does anyone have a workaround?

muggles · 18 Feb 2016

It is possible - I fitted a Nest to one of these boilers last week. From memory, on block 328, link N to Ns, Ls to Common on Hive and LR to the Hive switched live. You need to remove and discard the link between Ls and LR if present. Then set the programmer in the text display to constant on and you should be away

picasso · 18 Feb 2016

I think muggles has his boilers mixed up, there is a work around but its not a simple fix, do you have a tr2 fitted?

muggles · 18 Feb 2016

It was one of these...different boiler?

mthorniley · 18 Feb 2016

No. Don't have a tr2 fitted at the minute. Just running on timer and thermostatic valves

muggles · 18 Feb 2016

mthorniley said:
No. Don't have a tr2 fitted at the minute. Just running on timer and thermostatic valves

Was my link to the manual correct for your boiler or is it a different boiler you have?

mthorniley · 18 Feb 2016

That's the one. Yes

picasso · 18 Feb 2016

I think the problem was if you wired any other stat to the lr\ls connections the pump ran constantly.

mthorniley · 18 Feb 2016

picasso said:
I think the problem was if you wired any other stat to the lr\ls connections the pump ran constantly.

That's what I've read.

muggles · 18 Feb 2016

Yes, I found that initially...I didn't wire N to Ns and ended up with a constant pump and no heating. Making the link seemed to cure it - I've not had any complaints since anyway

mthorniley · 18 Feb 2016

Thanks

Just To clarify, would this be correct? Pick up permanent live and neutral off boiler, add link between N & Ns and remove link between L & Ls

then connect to hive as you stated

https://drive.google.com/file/d/0B_4Ee5EHHRU4bmJQTUczX3R2YVU/view?usp=sharing

I don't need to do anything with the existing TR2 connection block (3, 4 & F)?

mthorniley · 19 Feb 2016

muggles said:
Yes, I found that initially...I didn't wire N to Ns and ended up with a constant pump and no heating. Making the link seemed to cure it - I've not had any complaints since anyway

Hi

did you by any chance have a look at the diagram I posted?

Thanks

muggles · 20 Feb 2016

Looks good to me, just double check which of Ls and LR are permanent live (Common) before you start. You'll need a multimeter for that...

mthorniley · 20 Feb 2016

muggles said:
Looks good to me, just double check which of Ls and LR are permanent live (Common) before you start. You'll need a multimeter for that...

Thankyou

picasso · 20 Feb 2016

NS is neutral send which is already connected internally, LS is live send and LR is live return aka switched live, I will be very surprised if your boiler works properly as this is a well known problem, please let us know how it goes.