Nest Install (3rd Gen)

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matt s

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Hi,

Sorry to create yet another Nest thread, I've searched and seen there are quite a few, but none of them quite match my system and I don't really want to break anything!

I have a gas boiler in the kitchen along with a programmer (ESI ES 2-24/7) and a wired thermostat in the hallway. Upstairs in a cupboard there's a hot water tank. I'm pretty sure the system is Y-plan. There's a small junction box with 10 connectors in the cupboard with the hot water tank but none of the connectors appear to be labelled.

From what I've read I think I can just replace the programmer with the Nest HeatLink and the old wired thermostat can be replaced with the Nest thermostat as long as I use the 12v outputs on the HeatLink to power the new thermostat.

I've attached images of the backplates and wiring diagrams for my current programmer and thermostat. The basic HeatLink wiring info can be found here https://s3.amazonaws.com/support-assets.nest.com/images/Amber/a2-cables/a2-cables.jpg

I was going to:

1) Move the grey/brown wires that go between N and L on the programmer and the thermostat into T1 and T2 on the HeatLink to power the new thermostat.
2) Move the 2 wires from the programmer N to the HeatLink N
3) Move the 2 wires from the programmer L to the HeatLink L
4) Move the wire from the programmer CH ON (4) to the HeatLink CH call-for-heat (3)
5) Move the wire from the programmer HW ON (3) to the HeatLink HW call-for-heat (6)

Would this work? If not what's wrong that I need to do differently?

Many thanks for reading.

Matt
 

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as Dan,it's not that your system is unique it is that you haven't been able to understand the plentiful information already out there. Not having a go but getting it wrong could be more costly than paying a pro to fit it.
 
Last edited by a moderator:
matt s said:
Hi,

Sorry to create yet another Nest thread, I've searched and seen there are quite a few, but none of them quite match my system and I don't really want to break anything!

I have a gas boiler in the kitchen along with a programmer (ESI ES 2-24/7) and a wired thermostat in the hallway. Upstairs in a cupboard there's a hot water tank. I'm pretty sure the system is Y-plan. There's a small junction box with 10 connectors in the cupboard with the hot water tank but none of the connectors appear to be labelled.

From what I've read I think I can just replace the programmer with the Nest HeatLink and the old wired thermostat can be replaced with the Nest thermostat as long as I use the 12v outputs on the HeatLink to power the new thermostat.

I've attached images of the backplates and wiring diagrams for my current programmer and thermostat. The basic HeatLink wiring info can be found here https://s3.amazonaws.com/support-assets.nest.com/images/Amber/a2-cables/a2-cables.jpg

I was going to:

1) Move the grey/brown wires that go between N and L on the programmer and the thermostat into T1 and T2 on the HeatLink to power the new thermostat.
2) Move the 2 wires from the programmer N to the HeatLink N
3) Move the 2 wires from the programmer L to the HeatLink L
4) Move the wire from the programmer CH ON (4) to the HeatLink CH call-for-heat (3)
5) Move the wire from the programmer HW ON (3) to the HeatLink HW call-for-heat (6)

Would this work? If not what's wrong that I need to do differently?

Many thanks for reading.

Matt
Click to expand...

don't be a cheapskate & get a pro. Or you may end up costing yourself a lot of money...
 
[GALLERY=media, 85658]Untitled by Agile posted 20 Nov 2014 at 12:40 AM[/GALLERY]
 
Hi,

As a newbie, and not being able to figure out how to start a new thread, i thought i would start with an easy one.

I have a Saunier Duval Isomax F28e combi boiler which has a remote (hard wired) Saunier Duval Isocom programmer/thermostat. I plan to use the Nest wirelessly so i don't have to worry about T1 & T2.

My confusion lies with what cables i connect to the Heat Link. I think i'm right in just taking L & N from the boiler side of the isolator switch, but do i just re-use the former cable that ran to the Isocom and plug it in to 2 & 3 on the Heat Link? I don't want to fry my boiler panel.

Any advice appreciated.

Fosty.
 
fosty said:
Hi,

As a newbie, and not being able to figure out how to start a new thread, i thought i would start with an easy one.

I have a Saunier Duval Isomax F28e combi boiler which has a remote (hard wired) Saunier Duval Isocom programmer/thermostat. I plan to use the Nest wirelessly so i don't have to worry about T1 & T2.

My confusion lies with what cables i connect to the Heat Link. I think i'm right in just taking L & N from the boiler side of the isolator switch, but do i just re-use the former cable that ran to the Isocom and plug it in to 2 & 3 on the Heat Link? I don't want to fry my boiler panel.

Any advice appreciated.

Fosty.
Click to expand...

What you are suggesting won't work.

Jon
 
Any suggestions? Nothing seems straightforward with Nests diagrams. What are A and B on the Low Voltage combi boiler diagram? Assuming that is the diagram I need to follow.

Fosty
 
fosty said:
Any suggestions? Nothing seems straightforward with Nests diagrams. What are A and B on the Low Voltage combi boiler diagram? Assuming that is the diagram I need to follow.

Fosty
Click to expand...

Nest wiring diagrams are very straightforward. Probably one of the easiest to read out there.

If your struggling with those and how to create a thread on a forum then best getting in someone that doesn't.

A pro will work out cheaper than a new PCB or Nest when you inevitably f00k it up

Jon
 
Alright, remind me not to ask for advice again. Oh, a little less rudeness wouldn't go amiss either.
 
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