k8006

hello all ive ordered the transformer for the k8006 from esr in the uk transformer type212024c and its 2x12vac 1000ma which is ok but has three wires blue black blue 12 0 12 so do i just use the 2 blues to connect to the k8006 and isolate the black lead

hope you can help

If you use the two blue, you’ll get 24VAC !

If you use the black and one of the blue, you’ll get 12 VAC.