Replacing Danfoss to Nest thermostat Help!

Joined
15 Nov 2018
Messages
3
Reaction score
0
Country
United Kingdom
Hello nice people. Im trying to replace my existing Danfoss thermostat with Nest 3rd Gen. Lack of diagram understanding! I really do appreciate if you can give me not only clear answer, but also share how to read these simple diagrams. I really want to understand it.

My Combi Boiler is ideal isar he30 and here is a manual for it: https://www.freeboilermanuals.com/assets/pdf/ideal/203319_inst.pdf Page 32.
Inside boiler wiring. Main supply to thermostat.
upload_2018-11-15_21-34-0.png


Nest thermostat diagram:
upload_2018-11-15_21-40-50.png


upload_2018-11-15_21-39-49.png


Current thermostat is:
upload_2018-11-15_21-59-13.png



I will be very, very appreciated for your help!
 
Last edited:
Joined
8 Apr 2008
Messages
10,699
Reaction score
2,698
Location
Essex
Country
United Kingdom
You have posted a link to a conventional boiler but wrote that you have a combi, what boiler (make and model) do you have ?
 
Sponsored Links
Joined
15 Nov 2018
Messages
3
Reaction score
0
Country
United Kingdom
You have posted a link to a conventional boiler but wrote that you have a combi, what boiler (make and model) do you have ?
Its ideal isar he30, did I post wrong manual then ? I will try to google more. Sorry for that.
 
Joined
8 Apr 2008
Messages
10,699
Reaction score
2,698
Location
Essex
Country
United Kingdom
First remove link between what looks like L1 and earth on the boiler plug ? remove Danfoss stat use the live and neutral for the nest, connect com from old stat to 2 on nest and connect 4 from old stat to 3 on nest. old stat to
 
Sponsored Links
Joined
15 Nov 2018
Messages
3
Reaction score
0
Country
United Kingdom
First remove link between what looks like L1 and earth on the boiler plug ? remove Danfoss stat use the live and neutral for the nest, connect com from old stat to 2 on nest and connect 4 from old stat to 3 on nest. old stat to
Thank you, all working good!
 
Top