New thermostat wiring

[Paulius]

Hi, I hope someone can help me with this. I just got new thermostat but I'm a bit confused with the wiring. Because my old thermostat have only 3 cables- L,N and call for heat cable. The new thermostat I know when to connect L and N but I don't know in which port I need to connect -call for heat cable. I have standard boiler. Thanks for your help

 

[stem]

Odd use of a green/yellow earth wire there but...

Blue wire = N
Brown wire = L
Green/yellow = Switched live (call for heat)

So for the new thermostat:

Blue wire = N (3)
Brown wire = L (4)
Green/yellow wire = (2)
Insert a wire to link together terminals L (4) and (1)

Slip a brown sleeve over the green/yellow cable to show it is being used as a live wire and not an earth wire.

If there is an existing timeswitch or programmer somewhere and assuming that the new thermostat is a programmable version, the timeswitch should be set to be permanently on 24/7

 

[Paulius]

Great. Many thanks for helping me with this