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Despite the many acrimonius acronyms, The diagram on the side of the (last year's*) sensor shows
-BU (Blue) connecting to relay contacts, through the 'armature' of the relay. These contacts are wired to WH(ite) and BK (black) wires. The rectangles are supposed to be 'loads' which are connected to the +BN (brown).
For those unfamiliar with Euro style colour codes
here they are (English Only, although the system is used in every language (What language uses G for yellow ?))
Bk Bn R O Y Gn Bu V Gy W
Black Brown Red Orange Yellow Green Blue Violet Gr(e/a)y White.
Notice Bk, Bn, and Bu, each starting with the same letter, but each having a unique 2nd letter (Bl is black, or is it blue ?). Green and Gr(e/a)y are taken care of similarly, and the (e/a) of dark white or light black doesn't matter.
(*ours for 2002 still haven't arrived from Manchester)
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