Fitting Hive or Nest to Glow-Worm 38cxi

[SteveD88]

Looking for some advice for what will be the most straightforward to install out of Nest 3rd gen or hive single channel thermostat to my Glow-worm 38cxi combi boiler, which is currently wired to a Honeywell t40 thermostat and has a dial programmer fitted.

See photos of current setup and manual.

Screenshot_20210216-001442_Chrome

• SteveD88
• 16 Feb 2021

Blue and red wire from thermostat 1 and 3 go to the voltage free heating controls.

20210213_151736

• SteveD88
• 16 Feb 2021

20210215_193822

• SteveD88
• 16 Feb 2021

20210213_151924

• SteveD88
• 16 Feb 2021

Boiler is powered by a 3 pin plug, white cable enters boiler here (below photograph).

20210214_164844

• SteveD88
• 16 Feb 2021

Any advice will be much appreciated.

Cheers,
Steve

 

[ianmcd]

You can use either, but if using the nest do not make any links that you may have seen on other posts

 

[SteveD88]

What would be the best way to run a L, N and E to the Nest Heat Link if the boiler is currently on a plug?

Would I also just connect the 2 wires currently going to the thermostat to the heat link terminals 2 and 3?

Thanks

 

[ianmcd]

What would be the best way to run a L, N and E to the Nest Heat Link if the boiler is currently on a plug?

Would I also just connect the 2 wires currently going to the thermostat to the heat link terminals 2 and 3?

Thanks

Nest doesnt need an earth, your boiler shouldnt be run by a 3 pin plug, the L&N for the nest must come from the same supply as the boiler