Aprilaire 400 owner manual

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Capacity is high because an average-size home (10,000 cu. ft.) requires the addition of approximately 9 gallons of water per day to maintain 35% relative humidity when the outside temperature is 20°. The smallest Aprilaire Humidifier under most operating conditions, has this humidifying capacity. Trouble-free performance and minimum maintenance are assured by the design features of the Aprilaire Humidifier. All unit housing parts that come in contact with water are non-metal and will never rust or corrode. Neither heat nor water will affect them under normal operating conditions.

The Water Panel® evaporator, designed especially for uniform, high evaporation, along with the Scale Control Insert efficiently traps mineral deposits which are often the cause of damage to working parts in ordinary humidifiers. No “white dust” can be distributed throughout the living quarters. The Water Panel evaporator is the heart of the unit and must be in good condition to assure high capacity trouble-free performance. It should be changed once a year with the exception of the Model 400 where it should be changed twice a heating season.

Older design water distribution trays have a granular coating in the bottom of the distribution tray to provide equal distribution of water to each of the openings assuring an even flow over the Water Panel evaporator. Do not clean the mineral scale off the bottom of the water distribution tray at the end of the humidification season. If the granular coating is removed, it is not necessary to purchase a new distribution tray. You can accomplish the same uniform performance by applying a small amount of liquid dishwashing detergent over the entire inside surface of the water distribution tray. This will allow the water to flow evenly through each of the openings, provided, of course, the unit is level in order to achieve maximum capacity.

The current distribution tray which incorporates a synthetic fabric liner that replaces the granular coating, is designed to deliver water uniformly over the entire top surface of the Water Panel evaporator, provided it is mounted level. It is normal for some mineral deposits to form in the distribution tray as it dries out between humidification cycles. These deposits can actually help distribute water in the tray, but if they form enough to block the openings, they should be removed as described in the “Periodic Preventative Maintenance” section of this manual.

There are many humidifiers on the market. They all add moisture… with varying degrees of efficiency. None, however, can provide the features, design, and performance incorporated into your Aprilaire Humidifier.

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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 Dial % Relative Humidity Guide+40F 45% +30F 40% +20F 35% +10F 30% 25% 20% 15% Higher temperatureBe used to determine the RH WinterIII. Operating Instructions Effect of Water CharacteristicsHumidifier Control VI. Annual MaintenanceVII. Annual Summer Shutdown VIII. Periodic Preventative Maintenance Model Front Cover Feed Tube Base Water Panel Maintenance Instructions for Aprilaire Humidifier Model Limited Warranty Page Service and Water Panel Replacement Record Thank you Warranty Registration
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