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Trying to allow my E3 to control my two stage furnace but E3 only shows 1 stage option. Old thermostat had a W2 line wired up but DIP switch was set to single. Assuming furnace is handling it. Attached are pictures of the old thermostat wiring and the furnace panel. System also has an Aprilaire 700 that is attached to an Aprilaire 56 humidistat on plenum.
Any help would be greatly appreciated.