You need a 2 stage heat thermostat
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Sent from my iPhone using DIY Forum
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Yes, it should work if its designed to run a heat pump with auxilliary heat. Don't the instructions that came with the stat give any insights (this is a pretty standard set up)? As to the black wire, no idea. 
From the link above:
"On a heat pump system the compressor ("Y" terminal) is activated for both heating and cooling the only difference is that to switch to cooling the O terminal is activated to reverse the outdoor unit"
I think the thermostat will work with your system but you need to post the exact model number to figure out the wiring and, as Been says, check which wires go where in your furnace (you can't always go by the color). I think I know how this would work, but I'm reluctant to tell you something that could damage your compressor!
"On a heat pump system the compressor ("Y" terminal) is activated for both heating and cooling the only difference is that to switch to cooling the O terminal is activated to reverse the outdoor unit"
I think the thermostat will work with your system but you need to post the exact model number to figure out the wiring and, as Been says, check which wires go where in your furnace (you can't always go by the color). I think I know how this would work, but I'm reluctant to tell you something that could damage your compressor!
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