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How do you connect a single phase load to a Tesys U?

You have to use either an LUCC advanced control unit or an LUCM multifunction control unit. Please see wiring diagram below;

In simple terms the centre phase connections on the control unit are left un-connected.
This is not the same when using an electromechanical thermal e.g. LR** or electromechanical thermal magnetic e.g. GV**
Single phase motor contol with Tesys U LUCC
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