Aprilaire 60 Humidistat Manual: A Comprehensive Guide
This manual provides essential guidance for qualified heating and air conditioning professionals installing and servicing the Aprilaire 60 Humidistat.
It details crucial safety precautions, installation steps, system setup, troubleshooting, and technical specifications to ensure optimal performance and prevent potential hazards.
Proper installation is paramount to avoid electrical shock and condensation damage. This guide emphasizes disconnecting power, handling ductwork carefully, and avoiding improper mounting locations for accurate humidity control.
The Aprilaire 60 Humidistat is a crucial component in maintaining optimal indoor air quality and comfort by regulating humidity levels within a home or building. Designed for use with Aprilaire whole-house humidifiers, this device ensures consistent and accurate humidity control, preventing both excessively dry air and damaging condensation.

This humidistat is intended for installation by qualified heating and air conditioning contractors only, due to the potential for electrical hazards and the need for proper system integration. Incorrect installation can lead to serious injury or malfunction of the humidifier system. The Aprilaire 60 offers precise control, contributing to a healthier and more comfortable living environment.

Understanding its function and proper installation procedures, as outlined in this manual, is essential. This guide will walk you through the necessary steps to ensure safe and effective operation, maximizing the benefits of your Aprilaire humidification system. Prioritize safety and adhere to all provided instructions for a successful installation.
Understanding the Aprilaire 60 Model
The Aprilaire 60 Humidistat, identified by model number 10008419B AA ADHC, is engineered for precise humidity monitoring and control within forced-air heating and cooling systems. It’s designed to work seamlessly with Aprilaire whole-house humidifiers, offering reliable performance and consistent comfort.
This model features a digital display for easy readability and adjustment of humidity settings. It’s crucial to understand that the Aprilaire 60 is not designed to withstand high temperatures, therefore, specific mounting locations must be avoided – particularly the supply plenum or duct.
The unit operates on 120/240 volt power, presenting a potential electrical shock hazard if not installed correctly. Proper electrical disconnect procedures are vital before commencing any installation or maintenance. Understanding these key features and limitations is fundamental to ensuring the Aprilaire 60 functions optimally and safely within your home’s HVAC system.

Installation Procedures
Qualified HVAC professionals must perform the Aprilaire 60 installation. Carefully review all instructions and the template before beginning, prioritizing safety and adherence to electrical guidelines.
Safety Precautions During Installation
Prioritizing safety is crucial during the Aprilaire 60 Humidistat installation process. Electrical shock is a significant hazard; always disconnect electrical power to both the furnace and the humidifier before commencing any work. The manual explicitly warns that 120/240 volts can cause serious injury.
Physical hazards also require attention. Sharp edges present in ductwork and during plenum opening cuts can cause severe cuts. Exercise extreme caution and utilize appropriate protective gear when handling these materials.
Furthermore, avoid setting the humidifier to levels exceeding recommendations, as this can lead to condensation damage. Be mindful of condensation forming on windows in unheated spaces, indicating excessive humidity. Incorrect mounting can also create issues; avoid supply plenum or duct mounting due to temperature limitations.
Always follow all provided instructions meticulously to ensure a safe and effective installation.
Electrical Disconnect Requirements
Strict adherence to electrical disconnect procedures is paramount before initiating any installation work on the Aprilaire 60 Humidistat. The installation instructions unequivocally state that disconnecting electrical power to both the furnace and the humidifier is a non-negotiable safety step. This precaution directly addresses the severe risk of electrical shock associated with 120/240 volt systems.
Confirm power is completely off before handling any wiring or components. A voltage tester should be used to verify the absence of electrical current. This step isn’t merely recommended; it’s a critical safety measure to protect the installer from potentially life-threatening hazards.
Failure to disconnect power could result in serious injury or even fatality. The manual emphasizes this risk repeatedly, underscoring the importance of prioritizing electrical safety throughout the entire installation process. Double-check the disconnect before proceeding with any further steps.
Plenum and Ductwork Considerations
Careful consideration of plenum and ductwork is crucial for the proper function and longevity of the Aprilaire 60 Humidistat. The installation manual explicitly prohibits mounting the Humidifier Control directly on the supply plenum or within any ductwork. This restriction stems from the unit’s inability to withstand the elevated temperatures present in these areas, leading to potential malfunction and inaccurate readings.
Avoidance of these locations is non-negotiable. Furthermore, installers must ensure the Humidistat is not positioned downstream of the bypass outlet. Such placement introduces the risk of false humidity readings, causing the humidifier to operate incorrectly and potentially leading to condensation issues.
Proper placement ensures accurate humidity sensing. When cutting openings in the plenum or handling ductwork, exercise caution to avoid sharp edges that could cause injury. Prioritize a mounting location that adheres to the guidelines, ensuring optimal performance and preventing premature failure of the control unit.
Mounting Location Guidelines
Selecting the correct mounting location is paramount for accurate humidity readings and reliable operation of the Aprilaire 60 Humidistat. The installation instructions strongly advise against mounting the unit on the supply plenum or within any ductwork due to potential damage from high temperatures. This can lead to malfunction and inaccurate humidity sensing.
Specific attention is required for counterflow furnace installations. In these setups, it’s essential to ensure the blower continues running after the heat call is satisfied. This continued operation prevents high temperatures from damaging the Humidistat.

Display orientation is also critical. Avoid installing the unit with the display facing downwards, as this can cause inaccurate relative humidity (RH) measurements. Choose a location that allows for clear visibility and proper airflow around the unit, ensuring consistent and reliable performance. Following these guidelines will maximize the lifespan and effectiveness of your Aprilaire 60 Humidistat.
Avoiding Supply Plenum/Duct Mounting
Mounting the Aprilaire 60 Humidistat directly onto the supply plenum or within ductwork is strictly prohibited. The unit is not designed to withstand the elevated temperatures commonly found in these locations, leading to premature failure and inaccurate readings. This is a critical aspect of the installation process, directly impacting the longevity and performance of the humidistat.
Plenum temperatures can significantly exceed the operational limits of the control, causing internal component damage and rendering the unit unreliable. Incorrect humidity readings resulting from this improper placement will lead to inefficient system operation and potential discomfort.
Prioritize mounting locations away from direct heat sources and airflow. Selecting an appropriate location ensures the unit operates within its specified temperature range, providing accurate humidity control and maximizing its lifespan. Adhering to these guidelines is essential for a successful and trouble-free installation.
Counterflow Furnace Installation Notes
When installing the Aprilaire 60 Humidistat on a counterflow furnace, a specific operational consideration is crucial for preventing damage to the control. Counterflow furnaces have a unique airflow pattern, requiring the blower to continue running for a period after the heat call has been satisfied;
This continued blower operation is essential to dissipate residual heat that can accumulate around the humidistat. Without this cooling period, high temperatures can quickly build up, exceeding the unit’s operational limits and potentially causing internal component failure.
Ensure the furnace control system is configured to maintain blower operation post-heat call. This simple adjustment safeguards the humidistat from thermal stress, ensuring accurate humidity readings and extending the lifespan of the control. Proper configuration is vital for reliable performance in counterflow furnace applications.
Downstream Bypass Outlet Avoidance
A critical installation guideline for the Aprilaire 60 Humidistat concerns its placement relative to the downstream bypass outlet in the ductwork. Mounting the humidistat downstream – or after – the bypass outlet will invariably lead to inaccurate humidity readings and compromised system performance.
The bypass outlet introduces a localized change in air composition and temperature, creating a false representation of the overall duct humidity. This skewed reading will cause the humidifier to operate incorrectly, potentially over-humidifying or under-humidifying the living space.
To ensure accurate control, the humidistat must be positioned upstream of the bypass outlet, where it can sample representative air from the main duct flow. Avoiding this common installation error is paramount for achieving optimal humidity levels and preventing unnecessary energy consumption. Careful placement guarantees reliable operation.
Display Orientation for Accurate Readings
Proper orientation of the Aprilaire 60 Humidistat display is crucial for obtaining accurate relative humidity (RH) measurements. The unit is designed to function optimally when the display is positioned upright, allowing for natural air circulation around the sensing components.
Avoid installing the humidistat with the display facing downward. This orientation can trap cooler, denser air near the display, leading to falsely elevated RH readings. The unit will then incorrectly perceive the air as more humid than it actually is, triggering unnecessary humidifier operation.
Maintaining an upright display ensures that the sensor accurately samples the representative air within the duct, providing reliable data for precise humidity control. This simple precaution prevents inaccurate readings and optimizes system performance, contributing to a comfortable and healthy indoor environment. Proper installation is key.

System Setup and Operation
After installation, a thorough system checkout is essential. Verify correct wiring and functionality, then proceed to set desired humidity levels, carefully avoiding settings that could cause condensation damage.
Initial System Checkout
Following installation, a meticulous system checkout is absolutely critical to ensure proper operation and longevity of the Aprilaire 60 Humidistat. Begin by carefully verifying all electrical connections, confirming they are secure and adhere to the specified voltage requirements – either 120 or 240 volts.
Next, power on the furnace and humidifier, observing the humidistat display for correct initialization. Test the humidity control by manually adjusting the desired humidity level and monitoring the system’s response. Confirm that the humidifier activates and deactivates appropriately based on the setpoint and measured humidity.
Crucially, observe the blower operation after a heat call is satisfied. On counterflow furnaces, ensure the blower continues running to dissipate residual heat, preventing potential damage to the humidistat. Finally, visually inspect the installation for any loose wiring or potential obstructions. A comprehensive checkout minimizes the risk of malfunctions and ensures optimal performance.
Humidity Level Settings
Careful adjustment of humidity levels is paramount to maintaining a comfortable indoor environment while preventing costly damage. The Aprilaire 60 allows for precise control, but it’s vital to understand the potential consequences of improper settings.
Avoid setting the humidifier higher than recommended, as this significantly increases the risk of condensation forming on windows and within unheated spaces. Condensation can lead to mold growth, structural damage, and reduced insulation effectiveness. Regularly inspect windows for any signs of moisture, especially during colder months.

If condensation is observed, immediately reduce the humidity setting. Start with small adjustments and allow sufficient time to assess the impact. Remember that optimal humidity levels vary depending on outdoor temperature and home insulation. Prioritize preventing condensation over achieving a specific humidity percentage.
Preventing Condensation Damage
Condensation poses a significant threat to your home’s structural integrity and indoor air quality. Excess moisture can lead to mold and mildew growth, wood rot, and peeling paint, resulting in costly repairs. The Aprilaire 60, when properly configured, helps mitigate these risks.
Regularly monitor windows and exterior walls for signs of condensation, particularly in unheated areas like attics or garages. If condensation appears, immediately lower the humidity setting on the Aprilaire 60. Avoid attempting to reach recommended humidity levels if condensation is present, prioritizing dryness over a specific percentage.
Ensure adequate ventilation throughout your home to help remove excess moisture. Consider using exhaust fans in bathrooms and kitchens during and after moisture-generating activities. Proper insulation also plays a crucial role in preventing condensation by maintaining consistent surface temperatures. Addressing air leaks can further reduce moisture intrusion.
Blower Operation After Heat Call
Maintaining proper airflow after a heating cycle is critical for the longevity and accurate operation of the Aprilaire 60 Humidistat, especially when installed with counterflow furnaces. Prolonged exposure to high temperatures can damage the sensitive electronic components within the control unit.
Ensure the furnace blower continues to run for a sufficient period after the thermostat satisfies the heat call. This continued operation dissipates residual heat from the heat exchanger and ductwork, preventing overheating of the humidistat. The specific duration required will vary depending on the furnace model and ductwork configuration.
Consult your furnace manufacturer’s documentation for recommended blower run-on times. If your furnace does not automatically provide adequate post-heat blower operation, consider adjusting the furnace settings or consulting a qualified HVAC technician to implement a suitable solution. This preventative measure safeguards the Aprilaire 60 and ensures reliable humidity control.

Troubleshooting Common Issues
This section details solutions for electrical shock hazards, humidity control malfunctions, and inaccurate readings. Refer to the comprehensive troubleshooting guide for detailed steps and safety precautions when diagnosing issues.
Troubleshooting Guide Overview
The Aprilaire 60 Humidistat troubleshooting guide is a critical resource for installers and service technicians. It systematically addresses common operational problems, prioritizing safety throughout the diagnostic process. Before attempting any repairs, always disconnect electrical power to both the furnace and the humidifier to prevent serious injury from electrical shock.
The guide focuses on identifying the root cause of issues, rather than simply applying fixes. Common problems include false humidity readings, which can lead to incorrect humidifier operation, and malfunctions stemming from improper installation – such as mounting on a supply plenum. Carefully review the installation instructions to ensure adherence to guidelines.
Pay close attention to potential electrical hazards and always use appropriate safety equipment. The guide provides clear steps for verifying wiring connections and identifying damaged components. Remember that condensation damage can result from improper humidity settings, so address any concerns about excessive moisture promptly. A methodical approach, combined with this guide, will ensure effective and safe troubleshooting.
Addressing Electrical Shock Hazards
Electrical shock is a severe hazard when working with the Aprilaire 60 Humidistat and associated furnace systems. The manual emphatically stresses the absolute necessity of disconnecting electrical power to both the furnace and the humidifier before commencing any installation, maintenance, or troubleshooting procedures. 120/240 volt systems pose a significant risk of serious injury or fatality.
Never assume the power is off; always verify with a reliable voltage tester. Exercise extreme caution when handling wiring, and inspect all connections for damage or loose wires. If damaged wiring is detected, replace it immediately with appropriately rated components. Avoid working with wet hands or in damp environments, as water significantly increases the risk of electrical shock.
If you are uncomfortable working with electrical systems, do not attempt the repair yourself. Contact a qualified heating and air conditioning contractor. Remember, safety is paramount. Prioritize disconnecting power and exercising caution to prevent potentially life-threatening electrical hazards during all service operations.
Resolving Humidity Control Malfunctions
Humidity control malfunctions with the Aprilaire 60 can stem from several sources, requiring systematic troubleshooting. A primary concern is improper mounting; the unit must not be installed on the supply plenum or duct, as elevated temperatures will cause it to malfunction. Ensure it’s not downstream of a bypass outlet, which introduces false humidity readings.
Incorrect humidity level settings can also lead to issues. Avoid setting the humidifier higher than recommended to prevent condensation damage. If condensation appears on windows in unheated spaces, reduce humidity levels. Verify the blower continues running after a heat call on counterflow furnaces to dissipate heat affecting the control.
False humidity readings are a common problem. Ensure the display isn’t facing downward, as this can lead to inaccurate measurements. If problems persist, consult the full installation instructions and troubleshooting guide for detailed diagnostic steps and potential solutions. A qualified technician should handle complex repairs.
Identifying and Correcting False Humidity Readings
Accurate humidity readings are crucial for the Aprilaire 60’s effective operation, and false readings can lead to inefficient or incorrect humidifier function. A common cause is improper mounting – avoid positioning the control downstream of the bypass outlet, as this introduces inaccurate data. The unit’s location significantly impacts performance.
Display orientation is also critical. Never install the Humidifier Control with the display facing downward. This positioning causes the unit to incorrectly measure relative humidity (RH) within the duct, leading to skewed readings and improper operation. Ensure a clear, upward-facing display.
If false readings persist, re-evaluate the installation location. Confirm it’s not near heat sources or areas with significant airflow disturbances. Consult the comprehensive installation instructions for detailed guidance on optimal placement and troubleshooting steps. A qualified technician can assist with calibration or replacement if necessary.

Technical Specifications
The Aprilaire 60 Humidistat operates on 120/240 volt power, demanding careful electrical disconnect procedures during installation and servicing.
Its model number is 10008419B AA ADHC.
Voltage Requirements (120/240 Volts)
The Aprilaire 60 Humidistat is designed to operate with both 120 and 240-volt electrical systems, necessitating strict adherence to safety protocols during installation and maintenance.
Working with these voltages presents a significant risk of serious injury or even fatality from electrical shock.
Before commencing any work on the unit or its wiring, it is absolutely critical to disconnect the electrical power supply to both the furnace and the humidifier.
This ensures a safe working environment and prevents accidental energization of the system. Double-check that the power is off using a reliable voltage tester.
Qualified heating and air conditioning contractors should only undertake the installation process.
They possess the necessary training and expertise to handle electrical connections safely and correctly. Improper wiring can lead to equipment malfunction, fire hazards, and potential harm to occupants.
Always consult local electrical codes and regulations to ensure compliance.
Failure to do so may void warranties and create unsafe conditions. Prioritize safety above all else when dealing with electrical components.
Model Number Reference (10008419B AA ADHC)
The model number 10008419B AA ADHC uniquely identifies this specific Aprilaire 60 Humidistat configuration. This designation is crucial for ordering replacement parts, accessing specific documentation, and ensuring compatibility with your existing system.
When contacting Aprilaire customer support or a distributor, always have this model number readily available. It allows them to quickly and accurately identify the correct components and provide tailored assistance. Incorrect part numbers can lead to delays and frustration.
This model number may appear on the unit’s packaging, the device itself (typically on a label), or in the original installation documentation.
Referencing this number ensures you are receiving information and parts specifically designed for your Aprilaire 60 Humidistat.
Understanding the significance of the model number streamlines the maintenance and repair process, minimizing downtime and maximizing the lifespan of your humidification system. Keep this information in a safe and accessible location for future reference.































