Manuals / Aprilaire / Household Appliance / Humidifier

Aprilaire 400 +40F 45% +30F 40% +20F 35% +10F 30% 25% 20% 15%, Be used to determine the RH

Models: 400

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MANUAL MODE

TABLE 3 – Outdoor-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%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Your Aprilaire Humidifier Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FIGURE B

 

 

 

is a precision instrument that can

 

 

 

 

 

 

 

 

 

 

 

 

 

 

°

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

be used to determine the RH

 

 

 

 

 

 

 

 

 

 

 

40 F

 

 

 

 

 

 

 

 

 

 

 

 

 

45%

 

 

accurately in your home during

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

R

 

 

F

 

 

 

 

T

 

the winter.

 

 

U

 

 

°

 

 

 

R

E

 

 

 

 

 

 

 

 

S

 

AT

 

 

0

 

 

 

%

 

S

/

 

 

 

2

 

 

 

 

E

 

 

 

 

 

 

5

 

T

 

 

R

 

 

 

 

 

3

 

Y

 

 

 

 

 

 

 

 

 

 

 

 

 

To do this, follow these steps:

 

E

 

 

 

 

 

 

 

T

 

 

 

P

 

 

 

 

 

 

 

 

I

 

 

 

 

 

M

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

I

 

 

 

 

 

 

 

 

 

 

 

 

 

M

 

 

 

1. Activate the furnace blower by

 

E

 

 

 

 

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

U

 

 

 

 

R

 

 

 

 

 

 

 

 

H

 

 

setting your thermostat to a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

%

 

 

 

 

 

 

 

 

2

 

 

 

 

O

F

5

 

 

 

higher temperature.

 

 

 

%

 

 

F

 

D

°

 

 

 

 

 

 

 

 

 

 

F

 

T

0

 

 

 

O

 

 

 

U

 

 

 

 

 

 

 

 

2. Turn the control dial setting to

 

 

 

 

O

 

 

 

15%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the “Off” position. Then, slowly turn the dial clockwise until you

hear the solenoid valve on the humidifier “click on.” Next, slowly turn the dial counter clockwise until you hear the solenoid valve “click off.” At this point, read the RH on the dial. This will be very close to the actual RH in your home. (See Figure B)

To check the humidifier operation, set the knob to “Test/Reset”, make sure that the water saddle valve is open and that there is electricity to the unit. The furnace blower motor must be operating and the furnace calling for heat for the Aprilaire Humidifier to function. Note: Turning the knob to “Test/Reset” resets the “Change Water Panel” internal timer. After the humidifier has operated for one minute and water is entering the unit and coming out at the drain, reduce the humidistat setting to the recommended inside relative humidity, depending on the outside temperature. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE. Follow the suggested settings prior to a drop in the outside temperature.

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Aprilaire 400 +40F 45% +30F 40% +20F 35% +10F 30% 25% 20% 15%, Be used to determine the RH, Winter, Higher temperature
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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.