help needed wiring in a smart thermostat

help needed wiring in a smart thermostat

Author
Discussion

e39darren

Original Poster:

181 posts

89 months

Wednesday 26th November 2014
quotequote all
can anyone help me please , i recently bought a Nest learning thermostat and im a bit stumped when it comes to wiring it in confused

i sort of know my way around basic electrics but its confused me when i found it is wired with 4 core plus earth wire .
I have got a worcester greenstar 28i boiler and it is connected through a serviceplus s17 timer ( i dont need that so i plan to take it out and simplify the wiring ) and has a wired thermostat in a different room , here is a picture of the wiring diagram for the boiler -



here is a wiring diagram for the nest thermostat and heat link ( ill be using the thermostat wirelessly so wont be using my exsisting thermostat wiring )





id be extremely grateful if someone could point out which wires i need to connect , thanks in advance


hairyben

8,516 posts

131 months

Wednesday 26th November 2014
quotequote all
you diag isn't right... main supply to boiler goes to L and N

supply from boiler goes to stat, L and N on the stat to Ls and Ns

small link wire at the stat - L to common

L (switched) on the boiler to "calling" on the stat

e39darren

Original Poster:

181 posts

89 months

Wednesday 26th November 2014
quotequote all
thanks for replying and i think i understand now , does this diagram look right ? thanks


hairyben

8,516 posts

131 months

Wednesday 26th November 2014
quotequote all
almost- 3 to lr

this the return line- which calls for heat

e39darren

Original Poster:

181 posts

89 months

Wednesday 26th November 2014
quotequote all
hairyben said:
almost- 3 to lr

this the return line- which calls for heat
is this it smile



hairyben

8,516 posts

131 months

Wednesday 26th November 2014
quotequote all
e39darren said:
is this it smile


yup! thumbup

e39darren

Original Poster:

181 posts

89 months

Wednesday 26th November 2014
quotequote all
hairyben said:
yup! thumbup
excellent , thank you very much top man biggrinclap

moles

1,402 posts

192 months

Wednesday 26th November 2014
quotequote all
Awesome send that off to worcester as their new wiring diagram designer smile

e39darren

Original Poster:

181 posts

89 months

Wednesday 26th November 2014
quotequote all
moles said:
Awesome send that off to worcester as their new wiring diagram designer smile
im st hot with MS paint biggrinbiggrin

peteyfada

1 posts

59 months

Thursday 29th January 2015
quotequote all
Hi there, thanks for the diagram it was very helpful. One last question i have an earth cable coming from the boiler and one coming from the mains is there a spot i can connect these to or will i just cap them and leave them be?

VEX

4,400 posts

194 months

Thursday 29th January 2015
quotequote all
DO worry about me, I am not paying attention!

Doh!

V.

Edited by VEX on Thursday 29th January 17:38

hairyben

8,516 posts

131 months

Thursday 29th January 2015
quotequote all
peteyfada said:
Hi there, thanks for the diagram it was very helpful. One last question i have an earth cable coming from the boiler and one coming from the mains is there a spot i can connect these to or will i just cap them and leave them be?
earth cables typically aren't shown on functional diagrams, but earth continuity must be maintained throughout, if what you're connecting doesn't have an earth terminal as it doesn't need an earth (eg made of plastic) pop any earths together in a connector block and tuck out the way

jinkster

1,862 posts

104 months

Wednesday 9th November 2016
quotequote all
My WB Greenstar boiler has a cartridge type system on the front and a ribbon cable. Do you know where the start with the wiring?

johnfm

13,631 posts

198 months

Saturday 10th December 2016
quotequote all
That wiring diagram (with the link wire) makes things much simpler.

Just connected a Nest to my Worcester Bosch 400 Highflow last night. Works perfectly as wired above.

mccoullw

2 posts

36 months

Wednesday 14th December 2016
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Anyone got a photo of their Heat Link Wiring? It's the link between L to 2 that I want to get right!

Stevieboy666

2 posts

68 months

Sunday 18th December 2016
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I wired my nest into my Worcester combi greenstar cdi30 ,same as your diagram ,but no heating ? Do I disconect the timer on the boiler ,or leave it ,off or on position ? Any help will be cool thanks

Stevieboy666

2 posts

68 months

Sunday 18th December 2016
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Oh I did removed the link between lr and ls ?

mccoullw

2 posts

36 months

Monday 19th December 2016
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I wired my Worcester 24i Junior Combi up as above. Everything appeared to be working well for a day and this morning I have the dreaded red flashing light.

It appears to be Ignition lockout. Any ideas?

The boiler has an older click timer which i have just set to 'permanently on'. As I say, with this set up it was all going well but now I appear to have a problem.

Any help would be much appreciated!

ThunderSpook

2,600 posts

159 months

Thursday 22nd December 2016
quotequote all
mccoullw said:
Anyone got a photo of their Heat Link Wiring? It's the link between L to 2 that I want to get right!
I think the diagram is slightly misleading in that it doesn't show the live and neutral going in to the heatlink from the mains supply.

2 just requires a permanent live, same as 5 if you have the Nest V3. Use some Wago connectors if you want to make life a bit easier.

ThunderSpook

2,600 posts

159 months

Thursday 22nd December 2016
quotequote all
Stevieboy666 said:
I wired my nest into my Worcester combi greenstar cdi30 ,same as your diagram ,but no heating ? Do I disconect the timer on the boiler ,or leave it ,off or on position ? Any help will be cool thanks
Boiler timer should be in permanent on if it can't be bypassed.