Connection of central heating boiler thermostat.

[BigJon]

Hi, I try to avoid connecting up stats/timers to boilers at the best of times, so hopefully someone can help me connect up this programmable room thermostat to a friends boiler when it gets installed.
Here is the 5/2 Day programmable room stat connections (this is a volt free battery operated stat)

And here is the wiring diagram for the Sabre HE boiler.

Any help would be appreciated.

 

[ericmark]

With 6 way junction block the 1st and 3rd wires counting from left would go to 1 and 3 of thermostat. However with the new central heating system the temperature is normally controlled by the radiator TRV and not by a room thermostat.

Sometimes a thermostat is fitted purely to stop cycling in the summer months but of course the position is selected when it will heat up in morning sun rather than with room heat.

Switching off and on condensateing boilers can cause problems unless the lock shield valves are set correct. If not set correct one can get very long warm up times.

 

[BigJon]

Thanks, i'll suggest just using the TRV's to control the heat and just use the pre installed clock.
Cheers