Saunier duval smart thermostat

[Booth01]

Hi I am looking for a smart thermostat but don't know which will fit
I went on nest web site and said check wires for codes but won't fit
as seem to only have 1234 in circuit board just seeing if any one has fitting one
to these boilers
thanks

 

[leesparkykent]

Hi I am looking for a smart thermostat but don't know which will fit
I went on nest web site and said check wires for codes but won't fit
as seem to only have 1234 in circuit board just seeing if any one has fitting one
to these boilers
thanks

what model saunier duval?

 

[Booth01]

what model saunier duval?

Semia condens F24

 

[leesparkykent]

Semia condens F24

you should have a white external controls lead to connect external controls to. This connection is a volt free/ potential free contact that acts as a switch you must not apply any voltage to this connection.

Edit: The nest heat link relay is compatible with this method. In their manual they refer to it as a "dry contact".

 

[Booth01]

you should have a white external controls lead to connect external controls to. This connection is a volt free/ potential free contact that acts as a switch you must not apply any voltage to this connection.

Edit: The nest heat link relay is compatible with this method. In their manual they refer to it as a "dry contact".

Thanks yes got a white lead hanging down I will look for a nest one

 

[leesparkykent]

Thanks yes got a white lead hanging down I will look for a nest one

most thermostats will be compatible you just have to make sure you install it correctly as not to apply voltage to the external controls connection within boiler.

A few other options would be netatmo, owl, salus it500, hive, heatmiser neo, tado, etc

 

[Booth01]

most thermostats will be compatible you just have to make sure you install it correctly as not to apply voltage to the external controls connection within boiler.

A few other options would be netatmo, owl, salus it500, hive, heatmiser neo, tado, etc

Ok thanks looking at a Honeywell

 

[Booth01]

Ok thanks looking at a Honeywell

So the white wire acts as switch wire so I take a live from somewhere
else to power thermostat link box