Help! I have purchased a new Thermostat/Controller (Siemens REV11) but it only has 2 connections and the old thermostat has 4 (see pictures at link below).
Which of the four wires should I connect to the new controller?
//www.diynot.com/network/briandayson/albums/
Which of the four wires should I connect to the new controller?
//www.diynot.com/network/briandayson/albums/