The Aprilaire #50 current sensing relay is needed if you have a multi-stage furnace, and will simplify the humidifier installation on Furnaces without accessory terminals. The #50 relay is used to sense current to power the humidifier only when the furnace blower motor is running.
The #50 works with the these humidifier units: Honeywell: HE220, HE225, HE260, HE265, HE360, HE365, and Aprilaire: 445, 550, 558, 500, 560, 568, 600, 600
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Click here to for the Aprilaire #50 current sensing relay Installation Manual
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