I have just bought a Honeywell DT90E room thermostat to replace a faulty Heatmiser DS1. I have a Honeywell ST9400c programmer and Honeywell Mid Position Valve. I have read on several forums that the DT90E should be wired LIVE to A, SWITCHED LIVE to B, C is not used and Neutral wire is not used. I have tested my DT90E with a continuity tester and when I adjust the temperature to match the room temperature (or lower) the meter shows that A is switching to C. Surely this means that the SWITCHED LIVE should be connected to C?
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- Thread starter Ronaldo
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View the thread, titled "Honeywell DT90E room thermostat" which is posted in UK Plumbers Forums on UK Plumbers Forums.
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From what you have found A is Switching to C when the stat is satisfied.
Turn the stat up to 30 and it'll have continuity A to B
The Internet is often wrong, the Manufacturers instructions are rarely wrong;
http://www.honeywelluk.com/Documents/Installation-Guide/pdf/1072.pdf
Turn the stat up to 30 and it'll have continuity A to B
The Internet is often wrong, the Manufacturers instructions are rarely wrong;
http://www.honeywelluk.com/Documents/Installation-Guide/pdf/1072.pdf
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