Valliant EcoTec Pro30 Nest Installation

Ben.B · 4 Apr 2018

I had a lot of trouble finding a wiring diagram for this originally when i needed to install it, so i thought i would post my own here in case anyone else needs to do this in the future.

Im NOT an electrician, so please double check before you do this, but this method worked for me: https://www.diynot.com/diy/attachments/boiler-wiring-png.131440/

turn off boiler at mains/fusebox
wait for any power to dissipate from boiler ~30 mins
remove red RT loop (this disconnects the onboard boiler smart board)
wire in Call for Heat cable (long red cable)
wire in live/neutral

Keep in mind this is mains voltage so use the appropriate gauge wire.

Ive had this working without problems for 6 months.

Michael S · 23 Feb 2019

The reason ,I take it, for removing the red link is to stop the low voltage side of the cct keeping the boiler permanently on heating

Ben.B · 24 Feb 2019

Yes thats right, without that it will ignore the Nest and just use the onboard controller

Dan Robinson · 24 Feb 2019

Ben.B said:
Im NOT an electrician

You're not Gas Safe registered either, but I hold you plan on doing your 26.9 checks when you've finished.

Ben.B · 24 Feb 2019

I thought that due to this being an ancillary device due to it not bypassing any safety systems or directly linking to the gas control it was exempt from that legislation?

Dan Robinson · 24 Feb 2019

You're taking the front cover off the boiler which is sealed and will affect the combustion properties of the appliance.

muggles · 24 Feb 2019

As Dan says, you shouldn't be removing the front cover of boiler unless you're Gas Safe Registered

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Valliant EcoTec Pro30 Nest Installation

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