After some deliberation with SWMBO I agreed to replace the bog standard Drayton RTS1 analogue room stat with a digital one. I chose a Honeywell DT90E. So I removed the faceplate on the Drayton stat, and found it's a 3 wire (plus earth) installation - Live, Neutral and Call. Looking at the Drayton wiring diagram it's a switched live between Live and Call. Makes sense.
The wiring diagram for the Honeywell shows only one 3 wire installation, the rest being 2 wire. If I follow the 3-wire diagram will it work which wires should I connect where? The Live is obviously connected to terminal A. Do I need to connect the Neutral at all, and if so will it be to C?, or do I tape it up and just connect the Call to terminal B?
http://www.draytoncontrols.co.uk/sites/default/files/U%26IG.%20RTS2.pdffile:///Users/richardfletcher/Downloads/DT90E-Spec-Sheet%20(1).pdf
TIA