II. OPERATING INSTRUCTIONS – 400, 600 & 700

There are 2 possible modes of operation of your Aprilaire Humidifier Control – Automatic and Manual. An explanation of both modes follows:

Automatic Mode: (Manual Mode-see pg 6)

Your Aprilaire Humidifier Control is installed in the cold air return duct. During the first heating season, your Humidifier Control needs to be set initially to match your home’s condition. Please follow these steps when adjusting your control (refer to Figure A).

1.Turn the dial setting knob to “5,” which is within the normal range. During the next 24-48 hours it may be necessary to adjust the dial for more or less humidity, depending on your personal comfort and home’s requirements. Refer to the “Operation Guide” (Table 1).

2.During the coldest portion of the first heating season, minor adjustments may be necessary. This is dependent upon your home’s construction. Refer to the “Operation Guide” (Table 1).

TABLE 1 – Operation Guide

Condition

Solution

Condensation on windows

Reduce the setting on the control dial

 

by 1 increment.

Lack of humidity

Increase the setting on the control dial

 

by 1 increment.

Humidifier does not operate

Turn dial to “Test/Reset.” Make certain

 

furnace is operating in heat mode.

 

If unit still doesn’t operate, contact your

 

heating contractor.

 

 

Humidifier won’t shut off

Turn dial to “Off.” If unit continues to

 

operate, contact your heating

 

contractor.

Test mode

System operation is checked by setting

 

the knob to “Test/Reset.” Make certain

 

furnace blower is operating and furnace

 

is calling for heat. Humidifier will

 

operate for one minute. Be sure to turn

 

the control knob back to the prior setting

 

after checking humidifier operation.

Reset Water Panel change

Turn the control knob to the

indicator

“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.

 

 

- 4 -

Page 5 Page 7
Page 6
Image 6
Aprilaire owner manual II. Operating Instructions 400, 600
Page 5 Page 7

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.
Top Page Image Contents