Drayton Wiser install with Worcester Bosch CDI30

[Hazza24]

Hi,

Looking for advice to confirm how to wire up a new Drayton Wiser 1 channel smart thermostat to a Worcester Bosch CDI30. This will replaces an existing Drayton LP20RF dual channel digistat and wireless thermostat (easily removed).

As there’s no existing wall plate I need to wire this in.

Great to get confirmation of my understanding on the wiring for this (shown in my crudely drawn diagram)

Basically am I right in doing the following

From wall plate To boiler
N To N
L To L
Common (1) To Ls (Live switch)
Heating on (3) To Lr (live return)
Earth To Earth

I know I need to remove the bridge too.

Images of the boiler connectors and wall plate also included as might be helpful

Thanks for the help!
Steve

 

[stem]

Your drawing of the wiring connections as you show them would work OK. However, as Ls and Ns provide a 'Live Supply' and 'Neutral Supply' specifically for remote controls, I would connect it like this. It's easier than trying to get two wires in the boiler N & L terminals.

You should be careful with some combi boilers though. If yours is of a design where you have to open up a room sealed part of the boiler to access the wiring terminals, this is not a DIY job and should only be done by an RGI who can carry out the appropriate safety checks afterwards to make sure it is properly sealed up again afterwards. Unfortunately I don't know if your model of boiler falls into this category or not.

 

[Hazza24]

Thanks Stem. That makes a lot more sense to link the Live and Common (and a much smarter diagram to mine).

Thankfully no sealed parts to access in the boiler. The terminals are easy to access, just under a standard cover plate.

Appreciate the help!

 

[martyndc88]

You already have broken the combustion seal.on that particular boiler just to take that picture

 

[Neil4812]

Would this wiring diagram work for a Greensted 30SI with Drayton wiser 1, and do you have to remove anything as mine is already on a wireless thermastat

 

[stem]

If you post details of your existing wireless stat and the wires connected to it, someone will be able to advise how to swap it for a Drayton Wiser.