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Is this blower relay?
Like the one HERE
the unit is easily replaced with 2 relays, a 3 pole contactor. All it does is get a 24v signal that closes 3 circuits. The same as if you have 3 single pole relays closing..1 2 pole and 1 pole...
Are you familiar 3 pole contactors? do the same thing...24v coil and 3 contacts...but heavier duty.