Help with ufh wiring

[Jmay1981]

HI Guys

Im trying to wire up my wet ufh system to my boiler via heatmiser uhf4 wiring centre and a fastwarm wifi stat.

I want to run the underfloor heating through a seperate wifi stat rather than the the mechanical boiler stat.

I cant seem to get the stat to fire the boiler and the only way i can get it to work is to bridge it so it works with the normal central heating system.

PLease see below wiring diagram and close up of the boiler stat and wifi stat which hopefully might make more sense

Thanks in advance.


Jon

 

[ericmark]

nothing connected to com so will not work, likely needs a link wire com to line. Also

they look disconnected?

 

[Jmay1981]

Hi Eric

Thanks for the info I’ve linked the com and also the lr and ls from the boiler.

The WiFi thermostat is now working and firing the boiler. But the central heating system won’t work now on the mechanical timer on the boiler.

The boiler is a Worcester 34cdi with a mt10 timer.

Any ideas how I would be able to get the central heating to work off the mt10 timer so that the ufh is controlled by the WiFi thermostat and the central heating can run off the boiler timer?

Many thanks

Jon

 

[CountryFan]

Sounds to me like you may need zone valves, or perhaps a relay system