I have a 16 year old Tempstar condensing 90+ two stage with variable speed motor. I just connected a Lyric T5 thermostat and would like to have the thermostat control the staging rather than the furnace. The manual says the 4th DIP switch on the control board must be in the ON position for two-stage thermostat operation. At present only the 2nd and 3rd are in the ON position. If I move the 4th to the ON position do the 1st, 2nd and 3rd stay in their present positions? Are any other adjustments required other than the wiring?