You will not get high and low fan, pick the speed you want and tape the other off. The battery in the stat will make your 12V. Your right just jumper off RC/RH. Some folks add a small spst switch to it so they can use both fan speeds. If I remember right Honeywell told another member the same thing when they called. Also if you have a duro therm 2 zone system it will not work because of it being a slave stat. It doesn't sound like you have that problem.
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