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Aprilaire Humidifier Control to “OFF” or lowest setting before servicing. Principle of Operation . Operating Instructions – Model 400, 600 & 700. Aprilaire Humidifier Control. It offers two operation modes: Automatic / Manual mode. No other humidification system is fully automatic when operating in Download PDFs of Aprilaire owners manuals for existing and discontinued Aprilaire AprilAire Humidistat Model 63 and 5558 Owners Manual (for Model 866 Safety and Installation Instructions furnace and humidifier before starting installation. follow Aprilaire Humidifier Installation Instructions.Please leave this Operation Manual with the homeowner. Page 2. 3. 2. Your humidifier is controlled by either an Automatic Digital. THESE INSTALLATION INSTRUCTIONS. ARE FOR THE APRILAIRE® AUTOMATIC DIGITAL. HUMIDIFIER CONTROL ONLY! For Aprilaire® humidifier installation, follow Aprilaire