Aprilaire 400 owner manual VI. Annual Maintenance, VII. Annual Summer Shutdown, Humidifier Control

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Service hot water, 140° maximum, is recommended with drain type units for increasing capacity and for heat pump applications.

VI. ANNUAL MAINTENANCE

For best performance, we recommend that you replace the Water Panel evaporator in your Aprilaire Humidifier annually with the exception of Model 400 which should be changed twice a season. If you have a Humidifier Control equipped with a water panel timer, the “Change Water Panel” light will be lit (during operation only) when it is time to change your Water Panel.

To purchase a new Water Panel:

•Call the installer of your Aprilaire Humidifier. This information is often found on your equipment.

•Call your heating and air conditioning dealer.

•Use our “Dealer Locator” at: www.aprilaire.com

•Look in the Yellow Pages under Humidifying Apparatus or Heating & Air Conditioner Contractors.

•If none of the above is successful and you still need information, please feel free to write us.

•Purchase only Genuine Aprilaire Water Panels to maintain performance.

If your humidifier is equipped with an automatic control, after replacing the Water Panel, turn the control knob to the “Test/Reset” position until the “Change Water Panel” light blinks to reset the Water Panel change indicator timer. (Blower must be operating and furnace calling for heat.) Be sure to turn the control knob back to the prior setting after resetting the timer.

VII. ANNUAL SUMMER SHUTDOWN

1.For Models 400, 550, and 600 close the bypass damper, which is a part of the unit, with the use of the small damper handle. For older Model 550s without a built in damper, closer the bypass which is installed in the bypass pipe.

2.Shut off the water supply to the humidifier by closing the saddle valve.

Humidifier Control:

There is no adjustment to the Humidifier Control required for summer shutdown. (Applies to both Automatic and Manual Mode.)

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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 GuideWinter Higher temperature+40F 45% +30F 40% +20F 35% +10F 30% 25% 20% 15% Be used to determine the RHIII. 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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400 specifications

The Aprilaire 400 is a high-performance whole-home humidifier designed to enhance indoor air quality and provide superior comfort throughout your living spaces. As part of the Aprilaire family, known for their commitment to creating healthier environments, this model stands out due to its innovative features and advanced technologies.

One of the main characteristics of the Aprilaire 400 is its capacity to humidify homes effectively, covering an area of up to 4,000 square feet. This makes it ideal for large living spaces, ensuring that every room benefits from balanced humidity levels. The humidifier operates seamlessly with the home’s existing heating and cooling systems, requiring no additional maintenance, making it a hassle-free solution for homeowners.

A prominent feature of the Aprilaire 400 is its self-regulating technology. This unit uses a built-in humidistat that senses the moisture levels in your home and adjusts the humidification output accordingly. This ensures optimal humidity—typically between 30% and 50%—which can help reduce issues related to dry air, such as dry skin, irritated sinuses, and static electricity.

Another key benefit of the Aprilaire 400 is its evaporative design, which utilizes a water panel rather than a traditional water tank. This allows for efficient moisture dispersion, as the humidifier draws in dry air, passes it through the water panel, and releases it back into the living space as humidified air. The water panel is replaceable and designed for annual maintenance, promoting long-term functionality and hygiene.

The Aprilaire 400 also incorporates a simple installation process. With compatibility for various heating systems, including forced air and hydronic, it can be integrated into most homes without significant modifications. Its compact design is another advantage, ensuring it can fit unobtrusively in your home, maintaining the aesthetic of your space.

Overall, the Aprilaire 400 whole-home humidifier is a reliable solution for maintaining optimal humidity levels, fostering a healthier living environment, and enhancing overall comfort. With its advanced features, ease of use, and efficient operation, this humidifier is a smart investment for any homeowner aiming to improve indoor air quality and promote well-being.
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