mike4369
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Thanks for the reply. A diagram is attached to the control box lid showing the standard wiring layout, but it was just the extra terminal that intrigued me. Looking at all the other diagrams it shows configurations for Fast and Slow speed connections so maybe its part of that. As the spare terminal is wired into the control board circuitry it must do something. Anyway I'll wire it up as per supplier's recommendation, meanwhile I'll see what the manufacturer comes up with.
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