Replacing Salus IT500 with Nest

[Mad Scot]

Hi folks, first time poster although have used the forum loads in the past (thanks ).

Wonder if anyone could help me please? - currently have a Sales It500 and the app is becoming more and more annoying so planning on changing it to a new Nest for our current Combi Boiler (Logic + Combi C35).

Have attached pictures and the relevant wiring diagrams. Would anyone be able to confirm my thinking?

(from L-R)
Current COM - 2 Nest (COM)
Current NO -> 3 Nest (NO)
Current L wires -> L Nest (+ bridge to 2 - COM)
Current Neutral wires -> N Nest

The Nest thermostat itself will need to be in another room so will just be using the USB and stand.

Any help hugely appreciated!

 

[Mad Scot]

To add confusion there seems to be 3 cables into the back of the Salus controller. Any help appreciated

 

[CBW]

Yes, that should work fine

 

[mcprinter]

Could that extra Cable be the L+N+E Supply to the Boiler?
Looks like it connects directly to the Mains Feed to the Stat Receiver.

 

[Mad Scot]

Could that extra Cable be the L+N+E Supply to the Boiler?
Looks like it connects directly to the Mains Feed to the Stat Receiver.

Thank you - couldn't work it out ( does seem to have L+N) written on it and does seem to be connected to the L +N terminals. Have always been ok in wiring in new timers etc but the extra wire was throwing me. Think its ok to just go with the wiring my original post?

 

[Mad Scot]

Yes, that should work fine

Thank you!

 

[mcprinter]

Thank you - couldn't work it out ( does seem to have L+N) written on it and does seem to be connected to the L +N terminals. Have always been ok in wiring in new timers etc but the extra wire was throwing me. Think its ok to just go with the wiring my original post?

I am not a Plumber/Heating Eng.
Have done Stats, etc at Home and fix Electronic Kit for a living.
CBW has confirmed your wiring should be OK.

Was just thinking logically. It must be a supply to something!
You could (safely) disconnect the Far Left Red and see what happens with the Boiler.

 

[CBW]

As long as it works now, and all wires needed are transferred, then it should work on the Nest.