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Discussion Starter #1
Hi,



I have an "Ideal, independent C35" combi boiler and wish to fit my nest thermostat, it only has three wires running to the thermostat and one of those is an earth.



The wire marked "L" would seem to be marked on the nest control unit but where should I fit the other two wires?



Present thermostat

http://i993.photobucket.com/albums/af58/TEFUS2/null_zpsbfabcc24.jpg





Present Boiler

http://i993.photobucket.com/albums/af58/TEFUS2/null_zps33845d3e.jpg





Present wiring inside thermostat (L, SL and earth?)

http://i993.photobucket.com/albums/af58/TEFUS2/null_zps713d8b61.jpg





Nest control unit

http://i993.photobucket.com/albums/af58/TEFUS2/null_zpsc9bf3da8.jpg





If anyone could help please? Dont want to damage anything and am a bit unsure.:40oz::40oz::40oz:
 

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Your old one has

L - Live
SL - Switched Live
Earth

Your new one needs

L - Live
N - Neutral

2 - Common which will be a live feed usually
3 - which will be same as your SL on the old one

Your old one doesn't seem to have a neutral which is odd.....lol, I think you need to run a new cable as your a couple wires short, it's odd your old one doesn't have neutral. Didn't you get an instruction book with it that tells you?

Davie

Sent from my iPad using Tapatalk HD
 

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Discussion Starter #5
I spoke to a nest installer yesterday evening and booked him in for Friday, he quoted me £75 for the installation, I'll add more info after that has happened, I did explain to him that there was only three wires including the earth and he didn't seem bothered by this?

The boiler is quite a way from the thermostat, maybe he intends to change the location of the control unit to somewhere closer to the boiler and mount the wireless unit where the thermostat was.
 

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I bought a new drayton wireless unit for my crappy old gravity feed boiler. Didn't install it properly so I called Drayton help desk. The chaps asked me what colour wires I hand then told me step by step which goes where. Give your helpdesk a try.
 

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Discussion Starter #8
So it would seem that the best way would be to install this right next to the boiler?

That way it can be wired easily with the correct wires?

The unit is just a control unit to control the wireless thermostat so it would seem this may make for an easy install?

I could wire it to the boiler and place the thermostat where ever I like, will it be that easy?
 

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Sorry I can't see the images clearly as I'm on my phone and click in on them doesn't bring up the image but the last combi boiler I connected up with wireless stat all it needed was a feed from a fused spur and there was like a module receiver on the front of the boiler which then picked up the signal from the wireless room stat. So your existing room stat can be blanked off and the wireless one will send the signal to the boiler to start.
 

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On combi boilers you don't need a separate programmer to choose when you want the central heating on etc it's all programmable on the front of the boiler itself. Your current programmer will be redundant as will your room stat. So all you need is a fused spur with a 3A fuse and all the internal wiring is inside the boiler as long as you got power to the boiler and you program it, it will do the rest. And the wireless stat just sends the signal to the boiler to call for heating as and when required if it's in the right time scale you programmed it to. So if you only want heating to potentially come on between say 5-8pm then the stat can call for heat all day long but the internal programmer won't allow the boiler to fire up until 5pm. And as for hot water out the tap that is purely on demand. Does that make sense?
 

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Lol what's wrong with a conventional system these days haha!!! I wasn't even aware this sort of thing existed with the movement sensors? Does that mean if your in bed and not moving the boiler won't fire up? What if you go away for a week on holiday in the depths of winter the pipes will freeze if the boiler doesn't kick in?
 

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Discussion Starter #14
The thermostat learns what time you get up and puts it on before you rise, if you get up early it senses it.

It also monitors weather reports so knows if its snowing or freezing temps etc.

You just fit it and forget, never adjust temp, never turn off before you go out etc etc.
 
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