Kromschroder has replaced the UVS8T flame safety UV scanner with the new and improved UVS10D2. Replacing an obsolete unit with the new scanner can be confusing due to the wiring instructions. There is simply no indication as to which color of wire goes to which terminal, so here it is: Terminal No. 1 is Blue, (signal), No. 2 is Black, (220V), and No. 3 is white, (Neutral).