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My old room stat is a Drayton RTS 1 -it has 4 wires 1 = blue - neutral -- 2 = red live -- 3 = yellow /red call for heat --- 4 = earth yellow New stat is a Honeywell DT 90 E -- it has three connections a = live -- b = neutral -- c = ????? ( shows wire linked to a via switch ) Any idea...