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Hi, I'm replacing an old thermostat (Potterton PRT100ST) with 3 connections and (symbols): 3 (N) blue 2 (H) yellow 1 (TL) red on the new one (Siemens RDH10) (from manual) LX = Common L1 = Live feed to item to be controlled L2 = Changeover contact What colors should I plug...