Discuss Nest Thermostat Installation in the Central Heating Systems area at ElectriciansForums.net

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Ian Tait

Hello all

New to this forum but hoping to get some great advise. I have purchased a nest version 3 thermostat with a heat link. My boiler is a potterton suprima 40, and has what seems to be a simple 3 wire programmer. There are only 3 connections for this programmer labeled CH out, DHW on, DWH off.
On the nest heat link there is 3 wire connection for the central heating and 3 wire connection for the hot water, Can any one out there let me know how to wire this up

Many thanks

Ian
 
Welcome.

What instructions came in the box? Have you contacted the supplier?
 
That won't work very well!

Why is that then? All depends how the programmer is wired at the minute 1 is heating satisfied, 2 common, 3 heating on, 4 hw satisfied, 5 common, 6 hot water on. Am i wrong? All depends if he knows how to adjust connections at 3 port valve to remove original thermostat assuming its a y plan.
 
Hi Ian,

I'm new too - in fact this is my first post, but I've installed quite a few nests.

First thing that you'll need to do is remove the existing room thermostat cable (usually a 3 core), as the nest is now working as the programmer & room stat in one.

Depending on your type of system it will effect your wiring, I'll assume you have a Y plan considering the fact that you have a 'hot water off'.

Your three wire connections for heat / DHW are as follows

1 - CH Normally Closed
2 - CH Common
3 - CH Normally Open
4 - DHW Normally Closed
5 - DHW Common
6 - DHW Normally open

As such you'll need to link a live feed across from your L terminal to 2 & 5.

CH ON Will need to be connected to 3
DHW OFF Will need to be connected to 4
DHW ON Will need to be connected to 6

These connections should return to your mid-position valve, make sure you leave the cylinder stat in circuit, and there isn't too far you can go wrong from there.

Cheers.
 

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