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I have just bought a Sunvic TLX7501 digital thermostat. I am replacing an old Sunvic T40. The T40 has 4 inputs R, Y, B and an earth. The TLX7501 only needs a C (presume live) and a 1 and 2. The leaflet says that an earth is not required. Assuming I keep the live Red and put it to...