Aprilaire Humidifier Control Manual: A Comprehensive Guide

This guide details operation of Aprilaire humidifier controls, covering automatic & manual modes for 400, 600, & 700 series, plus specific model details.
Understanding Your Aprilaire Humidifier Control
Your Aprilaire humidifier is governed by either an Automatic Digital Humidifier Control or a Manual Humidifier Control system. The Automatic Digital Control boasts two operational modes: Automatic (AUTO) and Manual (MAN). When operating in Automatic Mode, the system intelligently manages humidity levels, offering significant benefits for home comfort.
For Model 500, 600, and 700 Series humidifiers, the control is set to ‘C’. A crucial indicator illuminates after 600 hours of operation, signaling a potential need for maintenance. Notably, the Model 62, designed for the Model 800 steam humidifier, arrives factory-set to OFF, lacking the Change Water Panel light.
With Manual Control, anticipating temperature fluctuations and adjusting settings to prevent condensation is vital, mirroring the approach when using the Digital Control in Manual Mode.
Types of Aprilaire Humidifier Controls
Aprilaire offers two primary humidifier control types: Automatic Digital and Manual. The Automatic Digital Humidifier Control provides convenient, automated humidity management with both Automatic and Manual modes. This system simplifies operation and optimizes comfort levels throughout your home. It features indicators, like the 600-hour light, to prompt maintenance.
Conversely, the Manual Humidifier Control requires more active user involvement. It necessitates anticipating outdoor temperature changes and proactively adjusting settings to avoid condensation. While demanding more attention, it offers direct control over humidity levels.
Model 62, specifically paired with the Model 800 steam humidifier, operates differently, lacking a Change Water Panel light and shipping factory-set to OFF.
Automatic Digital Humidifier Control
Aprilaire’s Automatic Digital Humidifier Control offers two operational modes: Automatic (AUTO) and Manual (MAN). In AUTO mode, the system intelligently manages humidity based on indoor conditions, providing set-it-and-forget-it convenience. It’s designed for use with Model 500, 600, and 700 Series humidifiers, simplifying humidity regulation.
A key feature is the 600-hour indicator light, signaling when maintenance—like water panel replacement—is needed. This proactive alert ensures optimal performance. The Model 62, used with the Model 800 steam humidifier, is an exception, shipped with the control set to OFF and lacking the Change Water Panel indicator.
This control type streamlines humidity management, enhancing comfort and indoor air quality.
Manual Humidifier Control
With the Manual Humidifier Control, proactive adjustment is key. Anticipate outdoor temperature drops and reduce the humidity setting accordingly to prevent condensation buildup – a practice mirroring operation in the Digital Control’s Manual Mode. This requires a more hands-on approach, demanding awareness of changing weather patterns.
Unlike the Automatic mode, the Manual control doesn’t self-adjust. Users must actively monitor and modify settings to maintain desired humidity levels. This method offers precise control but necessitates consistent attention. It’s ideal for those who prefer direct management of their home’s humidity.
Effective use of the Manual control balances comfort and prevents moisture-related issues.
Automatic Mode Operation
The Automatic Digital Humidifier Control offers convenient, self-regulating humidity management. Set the control to “C” for optimal performance with Model 500, 600, and 700 Series humidifiers. This mode automatically adjusts output based on indoor conditions, maintaining a consistent humidity level without constant user intervention.
A key feature is the 600-hour indicator light, signaling when to check the water panel. For Model 800 steam humidifiers, the Model 62 is factory set to “OFF” as it doesn’t require a change water panel indicator. Automatic mode simplifies humidity control, providing comfort and efficiency.

It’s a set-it-and-forget-it solution for consistent indoor air quality.
Setting the Control for 500, 600, and 700 Series Humidifiers
For 500, 600, and 700 Series humidifiers, the Automatic Digital Humidifier Control should be set to the “C” position. This setting allows the system to automatically manage humidity levels, providing optimal comfort and efficiency. The control continuously monitors indoor conditions and adjusts the humidifier’s output accordingly.
This eliminates the need for manual adjustments, ensuring consistent humidity throughout your home. Proper setting is crucial for maximizing the benefits of your Aprilaire humidifier. Remember to consult the Operation Guide (Table 1) for specific recommendations based on your home’s unique characteristics and climate.
Setting to “C” is the recommended starting point for these humidifier series.
The 600-Hour Indicator Light
The indicator light on your Automatic Digital Humidifier Control illuminates after 600 hours of operation. This light serves as a reminder to check and potentially replace the water panel within your humidifier. While not an immediate indication of failure, it signals that the water panel’s efficiency may be diminishing.
Regularly checking and replacing the water panel ensures optimal humidifier performance and prevents mineral buildup. Ignoring this indicator could lead to reduced humidity output and potential damage to the humidifier. Refer to your humidifier’s specific maintenance instructions for detailed panel replacement guidance.
This 600-hour interval is a preventative measure for maintaining peak efficiency.
Model 62 Considerations (Steam Humidifiers)
The Model 62 humidifier control, specifically designed for use with the Model 800 steam humidifier, arrives factory-set to the OFF position. Unlike other Aprilaire controls, the Model 62 does not feature a Change Water Panel light. This is because steam humidifiers operate differently than evaporative models, eliminating the need for a water panel.
Users of the Model 62 should understand this distinction and not expect a water panel indicator. Proper operation involves monitoring steam output and ensuring the steam humidifier itself receives regular maintenance, as outlined in its separate manual.
Focus on maintaining the steam humidifier components for optimal performance.
Manual Mode Operation
When utilizing Manual Mode on your Aprilaire humidifier control, proactive adjustments are crucial for maintaining optimal humidity levels. It’s essential to anticipate drops in outdoor temperature, as colder air holds less moisture. Consequently, reducing the humidifier setting prevents excessive condensation on windows and walls.
This mirrors the approach needed with the Digital Humidifier Control when operating in Manual Mode. Regularly monitor indoor humidity and adjust the control accordingly. Careful observation and timely adjustments ensure comfort and prevent potential moisture-related issues within your home.
Consistent monitoring is key to successful manual operation.
Anticipating Temperature Drops
Effective manual humidifier control hinges on predicting shifts in outdoor temperatures. As temperatures decline, the air’s capacity to retain moisture diminishes. Therefore, proactively lowering the humidifier setting before a significant temperature drop is vital. This preventative measure avoids over-saturation and the resulting condensation problems.
Failing to anticipate these changes can lead to dampness on windows, walls, and potentially, mold growth. Regularly checking the weather forecast and correlating it with your home’s humidity levels is recommended. Adjustments should be subtle and observed to find the optimal balance between comfort and preventing moisture buildup.
Adjusting Settings to Prevent Condensation
Condensation signals excessive humidity levels. If you observe moisture on windows or walls, immediately reduce the humidifier setting. Small adjustments are key; lower the setting incrementally and allow time to assess the impact. Monitor humidity levels closely after each adjustment.
Consider the home’s insulation and air leakage. Poorly insulated areas or drafty windows exacerbate condensation issues. Addressing these underlying problems alongside humidifier adjustments is crucial. Remember, the goal is to maintain comfortable humidity without creating a breeding ground for mold or damaging building materials. Consistent monitoring and fine-tuning are essential for optimal performance.
Digital Humidifier Control ー Model 60 Overview
Model 60 offers both Automatic and Manual operation modes, providing versatile humidity control. In Automatic mode, the system self-regulates based on indoor conditions, simplifying operation for consistent comfort. Manual mode allows for personalized adjustments, ideal for specific preferences or unique home environments.
The control panel features intuitive settings for adjusting humidity levels. A key indicator light signals when the humidifier is actively running. Installation is specifically for the Aprilaire Automatic Digital Humidifier Control only. This model is designed for ease of use and efficient performance, ensuring optimal indoor air quality throughout the heating season.
Installation Instructions (For Automatic Digital Control Only)
These instructions pertain solely to the Aprilaire Automatic Digital Humidifier Control. Ensure the control is installed within the cold air return duct for accurate temperature and humidity readings. Proper placement is crucial for optimal performance. Initial setup during the first heating season requires careful attention to your home’s specific conditions.
Refer to Table 1 in the Operation Guide for detailed guidance on initial settings. The control should be wired according to the provided diagrams, ensuring secure connections. Following these steps guarantees correct functionality and efficient humidity management. Professional installation is recommended if you are unfamiliar with electrical wiring;
Initial Setup During First Heating Season
During the initial heating season, your Aprilaire Humidifier Control requires specific setup to align with your home’s unique environment. It’s vital to follow the Operation Guide (Table 1) closely for recommended starting points. This table provides a baseline based on typical home characteristics and climate conditions.
Begin by observing your home’s humidity levels and adjusting the control accordingly; Monitor for condensation, which indicates excessive humidity. Fine-tune the settings gradually to achieve a comfortable and healthy indoor environment. Remember, the goal is balanced humidity, preventing both dryness and condensation. Consistent monitoring is key during this initial phase.

Following the Operation Guide (Table 1)
Table 1 within the Operation Guide serves as your initial benchmark for humidifier control settings. It correlates home characteristics – like square footage and insulation – with suggested humidity levels. Begin by identifying your home’s profile within the table.
The table provides a starting point; however, remember that individual homes vary. Monitor humidity levels closely after implementing the suggested setting. Adjust incrementally based on observed comfort and the absence of condensation. This guide isn’t a fixed rule, but a valuable starting point for optimizing your humidifier’s performance during the first heating season.
Operating Instructions for 400, 600 & 700 Series

Your Aprilaire humidifier control manages humidity levels effectively. For 400, 600, and 700 series humidifiers, the control offers both Automatic and Manual modes. In Automatic mode, set the desired humidity level, and the system adjusts accordingly.
Manual mode requires proactive adjustments based on outdoor temperature fluctuations. Lower settings prevent condensation during milder periods, while higher settings provide increased humidity when it’s colder. Regularly monitor humidity levels and adjust the control as needed. Remember the 600-hour indicator signals a check for the water panel, ensuring optimal performance.
Humidifier Status Indicators
Understanding the indicator lights on your Aprilaire humidifier control is crucial for monitoring its operation. A green light consistently indicates that the humidifier is functioning normally, actively adding moisture to your home’s air. This signifies the system is receiving power and operating as intended.
However, other lights may illuminate to signal specific conditions. The 600-hour indicator light prompts a check of the water panel, ensuring optimal performance and preventing mineral buildup. Pay attention to these signals, as they provide valuable insights into the humidifier’s health and efficiency, allowing for timely maintenance and adjustments.
Humidifier On: Green Light Indicator
The consistent illumination of the green light on your Aprilaire humidifier control signifies normal operation. This simple indicator confirms the humidifier is actively working to maintain your desired humidity levels. It means the unit is receiving power and the internal components are functioning as designed, adding moisture to your home’s air through the cold air return duct.

If the green light is steadily lit, no immediate action is required; your system is operating correctly. However, regularly checking the water panel and filter remains important for sustained performance. This indicator provides peace of mind, assuring you that your Aprilaire humidifier is contributing to a more comfortable indoor environment.
Control Location and Installation
Your Aprilaire humidifier control is strategically installed within the cold air return duct of your HVAC system. This placement allows the control to accurately monitor and regulate humidity levels as air circulates throughout your home. Installation is a critical step, ensuring proper functionality and optimal performance of your humidifier system.
Please note that detailed installation instructions are specifically provided for the Automatic Digital Humidifier Control only. These instructions guide you through the wiring and mounting process, ensuring a secure and reliable connection. Professional installation is recommended if you are unfamiliar with HVAC systems or electrical work. Correct installation is vital for efficient humidity control.
Specific Model Information
Aprilaire offers a range of humidifier controls tailored to different needs. Model 8126A and Model 8120A represent distinct options, each with unique features and capabilities. For zoned comfort systems, the Zoned Comfort Control provides localized humidity management, enhancing comfort in specific areas of your home.
Furthermore, the Aprilaire Model 6504 Zoned Temperature Control integrates seamlessly with zoned systems, offering precise temperature and humidity regulation. Understanding the specific features of your model is crucial for optimal operation. Refer to the individual model’s documentation for detailed instructions and troubleshooting tips. Choosing the right model ensures efficient and effective humidity control throughout your living space.
Model 8126A

Model 8126A is a sophisticated humidifier control designed for optimal indoor air quality. This control unit offers both automatic and manual modes, providing flexibility to match your comfort preferences and environmental conditions. It’s compatible with a variety of Aprilaire humidifier models, ensuring broad applicability within their product line.
The 8126A features a user-friendly interface for easy setting adjustments and monitoring of humidity levels. It allows precise control over humidity output, helping to maintain a comfortable and healthy home environment. Detailed information regarding installation, operation, and troubleshooting for Model 8126A can be found in the dedicated owner’s manual available on the Aprilaire website.
Model 8120A
Model 8120A represents another advanced offering in Aprilaire’s humidifier control lineup, designed to deliver precise humidity management. Like the 8126A, it supports both automatic and manual operational modes, adapting to diverse homeowner needs and climate variations. This control is engineered for seamless integration with compatible Aprilaire humidifier systems, enhancing overall performance.
The 8120A boasts intuitive controls and a clear display for effortless adjustments and real-time humidity monitoring. It contributes to a healthier indoor environment by maintaining optimal humidity levels, reducing dry air discomfort. Comprehensive guidance on installation, operation, and troubleshooting for Model 8120A is readily accessible through the official Aprilaire owner’s manual.
Zoned Comfort Control
Zoned Comfort Control systems from Aprilaire represent a significant advancement in home comfort, allowing for independent humidity and temperature regulation in different areas of the house. This is particularly beneficial for homes with varying heating and cooling needs, or those experiencing inconsistent humidity levels throughout. These systems often integrate seamlessly with Aprilaire humidifiers, providing precise control over each zone’s humidity.

By utilizing dampers and sensors, Zoned Comfort Control ensures optimal comfort and energy efficiency. Detailed setup and operational instructions are crucial for maximizing the benefits of this technology, and are available in the Aprilaire owner’s manual. Proper configuration delivers personalized comfort and reduces energy waste;
Aprilaire Model 6504 Zoned Temperature Control
The Aprilaire Model 6504 Zoned Temperature Control offers advanced capabilities for managing comfort in homes with multiple zones. This system allows independent temperature regulation in each zone, optimizing energy efficiency and personal comfort levels. It works in conjunction with dampers to direct airflow where it’s needed most, responding to individual zone thermostats.
Integration with Aprilaire humidifiers is a key feature, enabling coordinated control of both temperature and humidity in each zone. Proper installation and configuration are essential for optimal performance, and detailed instructions are found in the product’s installation manual. This system provides a sophisticated solution for whole-home comfort management.
Troubleshooting Common Issues
If your Aprilaire humidifier isn’t functioning correctly, first check the power supply and ensure the control is set to ‘Auto’ or ‘Man’ as desired. A green light indicates normal operation; absence of light suggests a power issue. Condensation problems often stem from overly high humidity settings – reduce the setting and monitor.
For the 600-hour indicator, simply replace the water panel after the light illuminates. Model 62 steam humidifiers don’t feature this light. If issues persist, consult the full owner’s manual or Aprilaire support for detailed troubleshooting steps and potential solutions. Always prioritize safety when inspecting or repairing the system.
Finding Additional Resources
For comprehensive support, Aprilaire offers a wealth of resources beyond this guide. While a specific owner’s manual may not be available for every model, current product information and downloads are accessible through their official website. Explore Aprilaire’s full range of indoor air quality products, including air purifiers and ventilation systems, to enhance your home’s comfort.
Directly contacting Aprilaire support provides personalized assistance with troubleshooting, installation questions, and warranty claims. Their knowledgeable team can guide you through any challenges you encounter. Remember to have your model number readily available when seeking assistance for faster, more accurate support.
Availability of Owners Manuals
Locating a dedicated owner’s manual for your specific Aprilaire humidifier control model can sometimes be challenging. It’s important to note that not all models have a readily available, downloadable manual. However, Aprilaire provides current product information and download options for many of their newer systems directly on their website.
If a specific manual isn’t available online, the comprehensive installation and operating instructions within this guide should cover most user needs. Additionally, Aprilaire’s customer support team can often provide guidance or clarify any operational questions you may have regarding your particular model.
Aprilaire’s Full Range of Indoor Air Quality Products
Beyond humidifiers and controls, Aprilaire offers a complete suite of indoor air quality solutions designed to enhance your home’s comfort and health. This includes high-efficiency air purifiers, capable of removing dust, pollen, and other allergens. They also provide whole-house ventilation systems, ensuring a constant supply of fresh air, and energy recovery ventilators (ERVs) to minimize energy loss.
Furthermore, Aprilaire manufactures advanced filtration systems, UV lights for germicidal control, and smart thermostats integrating seamlessly with their IAQ products. Aprilaire is dedicated to creating healthier, more comfortable living environments through innovative technology and comprehensive solutions.
Understanding Model 65 Humidifier
The Aprilaire Model 65 is a popular choice for whole-house humidification, known for its reliable performance and efficient operation. It’s designed to maintain optimal humidity levels, preventing dry air discomfort and potential damage to your home’s structure. This model typically integrates with an Aprilaire humidifier control, allowing for precise humidity management.
Key features include a durable construction, a large capacity water panel for efficient moisture output, and compatibility with various water supply options. Proper setup and control settings are crucial for maximizing the Model 65’s benefits. Refer to the specific control manual for detailed instructions on operation and maintenance.
Important Safety Precautions
When installing and operating your Aprilaire humidifier system, prioritize safety. Always disconnect power to the furnace before performing any maintenance or wiring. Never attempt repairs beyond your skill level; consult a qualified technician. Ensure proper ventilation around the humidifier to prevent moisture buildup and potential mold growth.
Be cautious when handling water connections to avoid leaks and potential electrical hazards. Regularly inspect the water panel and surrounding areas for signs of corrosion or damage. Follow all local plumbing and electrical codes during installation. Keep flammable materials away from the humidifier and furnace. Read and understand the complete owner’s manual before use.
Warranty Information
Aprilaire humidifier controls and systems are backed by a limited warranty, protecting against defects in materials and workmanship. Specific warranty durations vary depending on the model and component. Generally, the control itself carries a one-year warranty from the date of purchase. Extended warranties may be available for certain models or through authorized dealers.
To make a warranty claim, retain your proof of purchase and contact Aprilaire Customer Support. Warranty coverage excludes damage caused by improper installation, misuse, neglect, or unauthorized repairs. Review the complete warranty documentation included with your product for detailed terms and conditions. Registration of your product may be required to activate the full warranty benefits.

Contacting Aprilaire Support

For assistance with your Aprilaire humidifier control, several support options are available. You can access a wealth of resources, including frequently asked questions and troubleshooting guides, on the official Aprilaire website. Direct customer support is accessible via phone during business hours; check the website for current contact numbers.
Additionally, many local HVAC dealers are authorized Aprilaire service providers and can offer expert assistance. When contacting support, have your model number and date of purchase readily available to expedite the process. Online chat support may also be offered through the Aprilaire website. Explore the website’s “Contact Us” section for the most up-to-date contact information.