Honeywell Thermostat - Wiring Sanity Check

[BangDingOw]

Evening all,

Absolute amateur when it comes to reading wiring diagrams so hoping someone with experience can help me double check the wiring on a Honeywell Room Thermostat replacement and call bull on anything I say that’s incorrect.

Old analogue thermostat is a typical 3-wire setup with Live going to 1, Neutral to 2 and Switch Live to 3 which seems (to me) to align with the diagram inside the housing:

Everything seem ok so far?

I’m only looking to switch it out for a modern Honeywell equivalent which shouldn’t be too much drama. The Honeywell T6360B is the likely candidate and the wiring diagram is this:

Would it be a case of removing the old thermostat, fitting the new one and connecting Live to 1, Neutral to 2 and Switch Live to 3 (essentially matching the old unit)? The Neutral circuit is what’s getting me questioning myself as I don’t often (ever) read wiring diagrams so trying to get my head around it.

 

[ericmark]

Yes, marking are the same with both, 2 is neutral.

 

[Taylortwocities]

Strange, on the old one, 3 & 4 seem to be the other way round?????

 

[BangDingOw]

This is what has thrown me a little, the old one has the switch live on the ‘always closed’ position, where as the new one has it in ‘always open’.

It’ll be trial & error ultimately, set the thermostat really high and see if the boiler kicks in & shuts off when the dial is turned back down.

 

[ericmark]

I have seen some thermostat of this style which are designed for heating or cooling, and inside they have a dip switch which changes the N/O and N/C around, so with cooling or heating, if the battery becomes discharged, the unit will shut down. Or the reverse if battery becomes discharged the heating or cooling will not fire up.

It is not really required if not battery powered, so in the main N/O goes to the central heating, but there are exceptions.

 

[MeldrewsMate]

You won't do any harm if you first connect the output (S/L) to T3; if that works the wrong way around connect it to T4.