Aprilaire Official Manual for 550: Safety and Operating Instructions
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Automatic Humidifiers

Owner’s Manual

For Models 400, 550, 600 & 700

Includes Safety & Operating Instructions

and Warranty Information

READ AND SAVE THESE INSTRUCTIONS

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Contents For Models 400, 550, 600 Table of Contents Introduction Principle of Operation Page II. Operating Instructions 400, 600 Figure a % Relative Humidity Guide Outdoor Temperature F Dial Setting+40F 45% +30F 40% +20F 35% +10F 30% 25% 20% 15% Higher temperatureBe used to determine the RH WinterIII. Operating Instructions Effect of Water CharacteristicsVII. Annual Summer Shutdown VI. Annual MaintenanceHumidifier Control VIII. Periodic Preventative Maintenance Model Set Humidifier Control to its original position Notches Water Panel Front Cover Limited Warranty Page Service and Water Panel Replacement Record Thank you Warranty Registration
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