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The 80,000 furnace is not designed to perform with a 2 ton system .This is a 3.5/4 ton furnace.
You will need a smaller furnace or will have to do some experimental rigging .You could try replacing the motor with a lower hp motor, but will have to make sure the amp draw does not exceed rating on new motor
Not sure how that would work.I a not familiar with doing this as a solution to slow down a 120v AC motor .Would you like me to open he question to see if other experts may know?
Ok good luck with this.If I can assist further, let me know.I would probably get one of those universal "trip saver " motors that adjustable from 1'8 to 1/3 hp motor and experiment with speeds to find a speed that will move air slow enough across coil to maintain at least 17 degree drop and amp draw stay within parameters.
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I am thinking about using the trip saver shown at link below.You can cut the spade clips off that go to the taps and wire nut the wires to different speed wires. Maybe use 1/5 for cool and 1/4 for heat if you need heat to move more air than cool.