Myson Orion Boiler connection (split off from Nest thread)

[Uklee]

Ok so I will use the switched live that is in terminal 2. ( Currently it connected to a valve wire but this will be changed to the pump orange terminal block )

Keep the live and naturals as they are.

Unplug the 6 way plug and socket.

Install a link between terminals 5 4 and 2

This all look correct ?

 

[Uklee]

Uklee


actually it's not #11 gives a clue. #5 was giving you best advice.

You have the si model

Use the same switch live and permanent live connections,forget about pump over run

Thank you. Just still trying work out my exact wiring points on the terminal block along with the links to put back in for removing onboard programmer. And links to remove for using the nest as a remote stat

 

[Uklee]

Here's the wiring drawings in using

 

[Hot&Cold]

The wires in the internal boiler area could be left alone,just unplug the integral decked timer switch.Do your polarity checks etc (recommend due to boiler age & easy damage of electronics components- must be 27.5 + years vintage)

see how it goes

 

[Uklee]

I thought I would also need to make sure my switched live wire coming from my orange valve wires... Now need to be connected onto the (terminal 1) as that's the one that then goes down to the boiler stat and then onto the ignition.circuitboard.

I also think I need to keep the links 2 to 4 and 4 to 5 out.

 

[Uklee]

Looks like the black wire is the switched live wire that I'm now going to be using that's currently in number 2. Will move to terminal 1.

 

[Uklee]

All done. Thanks for all the help and advice given.

Lee