Aprilaire 400, 600 Manual Mode, Water Panel Change Indicator, Test/Reset, Additional Information

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MANUAL MODE

FIGURE B – Manual Mode

Manual Mode

Label and Resistor

90-1236

When installed in the Manual Mode (see Figure B), it is important to anticipate a drop in outdoor temperature and reduce the setting accordingly to avoid excessive condensation. For example, with an outdoor temperature of 20°F the correct setting will be 35% RH. If the temperature is expected to fall to 0°F that evening, then merely reduce the setting to 25% several hours prior to the temperature change.

See Table1 for the recommendedsettings. Thesesettings,whichare basedon years of research, represent a compromise between RH levels that would be most desirable for comfort and humiditylevels that are suitable for protection of your home and to avoid condensation on your windows. For example, a wintertime indoor RH of 50% may be considered ideal for comfort, but unfortunately, it probably would result in condensation, which can cause damage to your home. Observing the recommended RH levels on your Humidifier Control is an important safeguard. Condensation of water on the inside surface of windowsin the form of foggingor frostis usuallyan indication of too much RH. This same condensation can occur in other areas in your home, possibly resulting in damage.

TABLE 1 – Outdoor Temperature/Indoor Relative Humidity

Outside Temperature

Recommended RH

+40°F

45%

+30°F

40%

+20°F

35%

+10°F

30%

0°F

25%

– 10°F

20%

– 20°F

15%

 

 

WATER PANEL CHANGE INDICATOR

The control keeps track of humidifier operation time. The yellow “Change Water Panel” light flashes after a preset amount of running time has elapsed. This running time is preset by the installer based on the humidifier model and water characteristics.

Refer to the Annual Maintenance section for instructions on changing the Water Panel or call your heating and air conditioning dealer for service. After the Water Panel is replaced, turn the Control knob to the “Test/Reset” position until the green “Humidifier ON” light flashes, to reset the Water Panel change timer.

TEST/RESET

The Test/Reset feature allows the humidifier operation to be checked even if there is no call for humidity. See “Check the Humidifier Operation” on page 9.

ADDITIONAL INFORMATION

Your humidifier is a precision system that will accurately maintain the RH in your home. For every 2°F change in outdoor temperature, the Digital Humidifier Control will automatically adjust the indoor RH by 1%.

The Digital Humidifier Control will accurately control the humidity in your home to a maximum of 45% RH and a minimum of 10% RH.

The RH Values in Table 2 are targets based on outdoor temperature and the Digital Humidifier Control setting. The actual RH may vary due to conditions in the home (cooking, showering, etc.).

TABLE 2 – % Relative Humidity Guide

 

 

 

Outdoor Temperature (°F)

 

 

 

 

-10°F

0°F

10°F

20°F

30°F

40°F

 

 

1

10%

10%

10%

15%

20%

25%

RelativeHumidity

SettingDial

2

10%

10%

15%

20%

25%

30%

 

3

10%

15%

20%

25%

30%

35%

 

 

4

15%

20%

25%

30%

35%

40%

 

 

5

20%

25%

30%

35%

40%

45%

 

 

 

 

6

25%

30%

35%

40%

45%

45%

(%)

 

7

30%

35%

40%

45%

45%

45%

 

 

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Contents Humidifiers Introduction Table of ContentsPrinciple of Operation Operating Instructions Models 400, 500, 600 Digital Humidifier Control Indicator LightsAutomatic Mode Water Panel Change Indicator Manual ModeTEST/RESET Additional InformationCheck the Humidifier Operation Operating InstructionsDigital Humidifier Control Not Operate Manual Humidifier ControlAnnual Maintenance Effect of Water CharacteristicsControl in Test Mode or Humidifier will not Operate Additional Informationfor ALL ModelsAnnual Summer Shutdown Periodic Preventative MaintenanceWater Line Inspection and Service Instructions Series Model Warranty Registration Limited Warranty
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400, 600, 400M 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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