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Racricket

Nest Heat Link and Thermostat Y Plan

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Racricket    0
Racricket

Evening all I'm just looking for some clarification on the wiring of a nest heat link and thermostat..

The heating system is a y plan so at the programmer we have Live and Neutral in , a hot water satisfied, a heating demand and a hot water demand cable all going up to the wiring centre.

I'm thinking it's just a case of swap the cables from the programmer into the heat link and then disconnecting from the wiring centre the live out to the stat and the switch live back from the stat and just putting a link between the 2 terminals in the wiring centre..then simply pair the nest stat with the heat link 

Does sound correct 

Thanks in advance

 

 

 

 

Edited by Racricket

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Lurch    520
Lurch

Pretty much.

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binky    758
binky

the Nest is just a posh thermostat, treat accordingly.

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Lurch    520
Lurch
15 hours ago, binky said:

the Nest is just a posh thermostat

 

Well, posh programmer and thermostat.

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binky    758
binky

exactly :^O

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Dave Marshall    1
Dave Marshall

alright

you are right

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Chippy_boy    0
Chippy_boy
On 11/04/2017 at 19:55, Racricket said:

Evening all I'm just looking for some clarification on the wiring of a nest heat link and thermostat..

The heating system is a y plan so at the programmer we have Live and Neutral in , a hot water satisfied, a heating demand and a hot water demand cable all going up to the wiring centre.

I'm thinking it's just a case of swap the cables from the programmer into the heat link and then disconnecting from the wiring centre the live out to the stat and the switch live back from the stat and just putting a link between the 2 terminals in the wiring centre..then simply pair the nest stat with the heat link 

Does sound correct 

Thanks in advance

 

 

Hi - I hope you don't mind me asking a couple of questions?  I also have a y-plan system and at the programmer (Drayton LP241) I also have just 5 wires, the same as yours.  L & N in, HW & CH demand and HW satisfied.

 

First, it's not clear to me if the Common terminals on the heat link are connected to Live internally, or do I need to link them to the L terminal.  I don't have the Nest yet, so can't test with a multimeter.

 

Second, what did you mean by "link between the 2 terminals in the wiring centre"?


Finally, do I need to connect the Heat Link terminal 1 (CH Satisfied) to anything?  I only have HW satisfied at the programmer.

 

Thanks for any help you can offer.


Cheers

 

Chip.

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Chippy_boy    0
Chippy_boy

Sorry - not sure if I can edit posts, but FWIW, my existing system is wired like this:

 

ScreenShot2017-08-10at11.22.47.png

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steptoe    2,089
steptoe

The nest has 'no volt' switching,

There is no voltage on the switching terminals, its so you can use it to switch elv boilers as well as mains ones,

No need for CH satisfied connection

 

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Chippy_boy    0
Chippy_boy

Thanks - so I need to link live to the HW and CH common terminals, right?

 

I just need to figure out how to get 12v from the Nest Heat Link to the Nest thermostat?!? I had mistakenly thought my existing thermostat was connected to the Drayton timer, but of course it's not - it's wired up to  a the junction box in the airing cupboard upstairs.  Since I don't have any spare wires going from the timer to the junction box, is my only option a separate 12v supply up in the airing cupboard?  I can't see how I can get the 12v out from the Nest Heat Link to the thermostat.

 

I'm trying to do all this "in my head". Perhaps it will be a lot easier when I've actually bought the kit and got the wires exposed!

Edited by Chippy_boy
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steptoe    2,089
steptoe

The stat simply plugs into a nearby socket 

 

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Chippy_boy    0
Chippy_boy

... if there is one ;-)

 

The stat is going on the wall, at eye level.

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steptoe    2,089
steptoe
24 minutes ago, Chippy_boy said:

... if there is one ;-)

 

The stat is going on the wall, at eye level.

It comes with a plug in PSU 

 

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Chippy_boy    0
Chippy_boy

Thanks - I know this. It's a matter of where to plug it. I was hoping to run the 12v line from the Heat Link, but that might be more difficult than I thought. Having to fit a fused spur in the airing cupboard simply to plug the Nest PSU in, is a bit of a pain in the ****. Plus the fact it's damp and 130 degrees in there - not exactly ideal for the PSU!

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Lurch    520
Lurch

This is exactly why I don;t really fit the Nest, the wired or plugged in stat is a PITA. I fit the Drayton MiGenie by preference. The programmer simply goes in place of the existing programmer (backplate is the same, not that stupid tiny bit on the edge of the Nest) and the room stat is completely wireless. It's basically a wireless programmable stat with an an extra wireless bit that simply plugs into the router. Never had an issue installing these, always some quirk or oddity when fitting the Nest though.

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Andy™    2,096
Andy™

the amount of questions about the same thing would suggest the manual that comes with it is not fit for purpose, or they are being sold / advertised as an easy DIY swap when they are not....

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Chippy_boy    0
Chippy_boy

Thanks folks for your help.


@Andy: they are not sold as an easy DIY swap.  DIY install is not recommended, hence the questions.  It doesn't come with an installation manual.

Edited by Chippy_boy

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steptoe    2,089
steptoe

I agree with @Lurch

The nest is a PoS

I fit loads of them for landlords, and they are basically carp,!!!

 

@Chippy_boy 

Just noticed, you haven't bought it yet, so DONT, get something else 

 

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Chippy_boy    0
Chippy_boy

Hmmmm, interesting comments.  Why do you say this, steptoe?  What's wrong with it exactly?

 

I've looked at Hives and several of them in the shops have been broken - with the same fault - so I am not tempted by those.  The Nest looks great and has decent reviews.  What's wrong with it?

Edited by Chippy_boy

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Lurch    520
Lurch
9 minutes ago, Chippy_boy said:

What's wrong with it exactly?

 

As per my comments, it is not a straight swap and the room stat needs to be wired to something. The wireless room stat on the MiGenies is the main reason I use them and not the Nest.

 

Reliability wise I've had no issues with either, but the MiGenie is half the price of the Nest, UK designed & manufactured etc so ticks all the boxes for me.

 

The Hives (regardless of reliability) are not worth paying a monthly subscription for.

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Chippy_boy    0
Chippy_boy

I can see the advantage of ease of installation, but in terms of the device itself, the MiGenie just doesn't seem to do the things Nest does.  I don't believe it learns any patterns, and I don't think it does geofencing either.  And it's about £160 vs £185 (if you shop around) for the Nest, so price-wise neither here nor there.  And it doesn't imho look anything like as nice.  Since reliability is apparently not a differentiator, it would seem the only advantage is ease of installation, which to be honest, doesn't swing it for me.

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steptoe    2,089
steptoe
1 hour ago, Chippy_boy said:

Hmmmm, interesting comments.  Why do you say this, steptoe?  What's wrong with it exactly?

 

I've looked at Hives and several of them in the shops have been broken - with the same fault - so I am not tempted by those.  The Nest looks great and has decent reviews.  What's wrong with it?

 

1 hour ago, Chippy_boy said:

I can see the advantage of ease of installation, but in terms of the device itself, the MiGenie just doesn't seem to do the things Nest does.  I don't believe it learns any patterns, and I don't think it does geofencing either.  And it's about £160 vs £185 (if you shop around) for the Nest, so price-wise neither here nor there.  And it doesn't imho look anything like as nice.  Since reliability is apparently not a differentiator, it would seem the only advantage is ease of installation, which to be honest, doesn't swing it for me.

 

the design brief for the nest [imho] must have specifically stated that reliability  , and user-friendliness, must be avoided at all costs

you will be continually resetting it,

repairing it to your router

and reprogramming it when it decides it will pick and chose when your heating is on and not you

 

 

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Lurch    520
Lurch
1 hour ago, Chippy_boy said:

I don't believe it learns any patterns,

 

I think you might be right there, but it's not a major issue for the most part. What exactly are you missing out on there? If you set the heating to come on at 5 the MiGenie turns on at 5. The Nest tries to get the place warm for 5. I know it wouldn't take my heating long to get the place warm for 5 so I'd set it to come on at maybe 4:45. More marketing blurb from Nest, it really isn't all that much of a useful feature and doesn't really do anything.

 

1 hour ago, Chippy_boy said:

and I don't think it does geofencing either.

 

If you feel that is important, again pros and cons to this. I find this completely useless, if I am popping out for an hour the heating would turn off, then the place would cool down and when I get back I'd be sat waiting for it to warm up again. I can sort of see the advantage in some instances, not really a deal breaker IMO, especially all things considered.

 

1 hour ago, Chippy_boy said:

it's about £160 vs £185

 

Didn't realise the Nest had come down in price so much, that used to be a huge factor.

 

1 hour ago, Chippy_boy said:

Since reliability is apparently not a differentiator, it would seem the only advantage is ease of installation, which to be honest, doesn't swing it for me.

 

Maybe I suppose, I am an electrician, I do not want to be faffing around fitting rubbish ill thought out awkward devices (over and over again....). I suppose as a DIYer YMMV, you are only doing it once.

 

So yeah, go for it then. Have fun.

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Chippy_boy    0
Chippy_boy

Thanks folks - really appreciate your helpful input.

 

I apologise if I sounded dismissive of the MiGenie recommendation. I didn't mean to.  I am grateful for your help.

 

Cheers again.

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