Help needed with thermostat wiring

[keithbr13]

Hi Everyone.

Customer has asked me to install a siemens RDJ10 programmable room stat to a ferroli Optimax he plus 31c combi boiler.I have nt wired one of these stats before and would appreciate a bit of guidence on what to conect where. the siemans instructions are pretty basic. Thanks

 

[binky]

Basically just wires to roomstat terminals at boiler. You then leave boiler 'ON' and thermostat does the rest. Should be simple

 

[steptoe]

L N E to progstat, and a L N E and Sw/L to boiler,

you can either take the LNE from the progstst or FCU, its up to you,

obviously the Sw/L has to come from the progstat, its just like any other stat except it has an inbuilt clock to vary the temp at different times of the day, hence the permanent line required at the stat.

HTH.