OPERATING INSTRUCTIONS – MODELS 400A, 500A, 600A & 700A

The Automatic Digital Humidifier Control offers two modes of operation, Automatic or Manual. An explanation of both modes follows. (See Figure A on page 5 for Automatic Mode. See Figure B on page 6 for Manual Mode.)

When in the Automatic Mode, this system offers the following benefits:

•You will always receive the optimum amount of humidity so that your home and its furnishings are always protected from the damaging effects of excess condensation or low humidity during the heating season. The Control automatically adjusts your home’s RH based on the outdoor temperature, increasing the time maximum comfort is maintained.

•Simple operation with few adjustments. The Control eliminates the need to manually adjust the control when outdoor temperature changes. It also eliminates the need to turn the dial setting to “OFF” during the summer season.

AUTOMATIC DIGITAL HUMIDIFIER CONTROL INDICATOR LIGHTS

Call Dealer for Service: The red light indicates that the humidifier is not operating normally and that service is required.

Change Water Panel: The yellow light indicates that it is time to change the Water Panel in the humidifier.

Humidifier On: The green light indicates that the humidifier is operating normally.

AUTOMATIC MODE

FIGURE A – Automatic Mode

90-1235

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 TABLE 3 – Operation Guide.

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 TABLE 3 – Operation Guide.

The RH in your home will now be accurately controlled to meet your needs and should not need further adjustment during future heating seasons. Make note of the dial setting in the event you temporarily move the knob to “OFF” when performing annual maintenance of your Aprilaire humidifier.

- 4 -

- 5 -

Page 3 Page 5
Page 4
Image 4
Aprilaire 400A, 700M, 500M, 600A, 600M, 500A, 700A Automatic Digital Humidifier Control Indicator Lights, Automatic Mode
Page 3 Page 5

700A, 500A, 600A, 500M, 700M specifications

Aprilaire is a leading brand in the field of indoor air quality, and its series of humidifiers like the 600A, 700M, 400A, 500A, and 600M have been designed for optimal performance and user convenience. These humidifiers are engineered to maintain ideal moisture levels in your home, which is especially important during dry winter months.

The Aprilaire 600A is an advanced model equipped with automatic humidity control. This feature enables the humidifier to adjust moisture levels based on the outdoor temperature, ensuring a comfortable indoor environment throughout the changing seasons. The 600A is also easy to install and integrates seamlessly with your home’s HVAC system, supplying humidity throughout the entire house.

In contrast, the 700M is a manual humidifier option that offers flexibility in controlling humidity levels. This model is particularly suitable for homeowners who prefer a hands-on approach. The 700M can deliver up to 0.75 gallons of moisture per hour, making it effective for larger homes or spaces where humidity needs to be closely monitored.

The Aprilaire 400A and 500A models are geared towards versatility and space efficiency. The 400A, designed for homes with lower humidity requirements, operates quietly and offers a less invasive installation. It is suitable for areas up to 4,000 square feet, making it ideal for many average-sized homes. The 500A, on the other hand, is particularly designed for homes with a higher demand for moisture, providing consistent humidity control for larger spaces.

The Aprilaire 600M is another manual option that combines a straightforward user interface with robust performance. Similar to the 700M, it allows users to manually adjust humidity levels but features a slightly superior output rate.

One of the standout characteristics shared among these models is their ability to minimize the effects of dry air. By maintaining the right humidity levels, these humidifiers help reduce the likelihood of respiratory issues, dry skin, and static electricity, along with protecting wooden furniture and flooring from damage.

Overall, the selection of Aprilaire humidifiers offers something for every homeowner, from automated models that take the guesswork out of humidity control to manual options that provide a personal touch. Each model boasts its unique features while ensuring a healthier and more comfortable living environment year-round.
Top Page Image Contents