Wiring Drayton Digistat+ To A Worcester-Bosch 280RSF

[Grahammore]

Afternoon Gents
I am hoping you may be able to help me out.
I want to replace my existing damaged Drayton RTS1 Room Thermostat with a Drayton Digistat +. The existing thermostat has three connections coming from the 280 RSF boiler into its base plate/terminal block, these being:
Terminal N – Blue Cable
Terminal L – Brown Cable
Terminal 3 (Call) – Yellow/Green Cable (rapped in red insulating tape).

The proposed Digistat + unit has a set of four terminals, these being:

Terminal 1 – Off (Heating satisfied of call for cooling)
Terminal 2 – On (Call for heat)
Terminal 3 – Com (Common)
Terminal 4 – N (Not required)

As the new thermostat only requires a two wire connection, am I right in thinking that I need to connect the brown cable from the boiler to the COM terminal of the thermostat, connect the yellow/green cable to the On (Call for Heat) terminal of the thermostat and to disconnect and isolate the blue cable at both ends. Or is this a waste of time due to the age of the boiler (installed about 11 years ago) and should I replace the damaged thermostat like for like.

Any help would greatly appreciated.

 

[twgas]

I should think you are correct, I would use the blue (flagged with brown tape)as the switched live back from r/stat. This would mean taking out and making safe the gr/yell at both ends.

Hope thats clear enough for you, if not let us know and I'll see what I can do, or one of the others on here may explain it better.

 

[Grahammore]

Thanks Twgas

That cleared things up, also make sense about using the blue wire tagged brown lot less confusion.

Cheers