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The UIB L is not what you want to install in the newer style furnace. You should check out http://www.dinosaurelectronics.com/UIB_Chart.htm and you will probably want to use the Fan 50 Plus board that can handle the two wires you are asking about.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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