Aprilaire 800 Steam Humidifier Manual: A Comprehensive Guide
This manual provides essential guidance for the Aprilaire 800 series, offering details on operation, installation, maintenance, and troubleshooting—available online as PDF documents.
Understanding the Aprilaire 800 Series
The Aprilaire 800 series represents a significant advancement in whole-home humidification, utilizing steam technology to deliver precise and consistent humidity control. These units are designed for optimal performance and efficiency, addressing the challenges of dry air during heating seasons. Available documentation, including application manuals, specifications, and maintenance instructions, are readily accessible online in PDF format – with 16 manuals currently available for free viewing or download.
Understanding the core functionality involves recognizing its capacity to add moisture directly to the home’s air, bypassing the limitations of evaporative humidifiers. The series caters to various home sizes and climate conditions, offering a solution for improved comfort, health, and protection of wood furnishings. Proper operation and maintenance, as detailed in the owner’s manual, are crucial for maximizing the lifespan and effectiveness of the system.
Key Features and Benefits
The Aprilaire 800 steam humidifier boasts several key features contributing to enhanced indoor air quality and comfort. Its steam technology delivers 100% humidity, eliminating the risk of mineral dust often associated with other humidification methods. This results in cleaner, healthier air for occupants. The series offers precise humidity control, allowing users to maintain optimal levels tailored to their preferences and needs.
Benefits extend to protecting wood floors, furniture, and musical instruments from drying and cracking. Furthermore, adequate humidity can alleviate symptoms associated with dry skin, respiratory issues, and static electricity. The available manuals detail how to leverage these features, including adjustments for seasonal changes and condensation control. Proper utilization, guided by the documentation, ensures a comfortable and healthy home environment throughout the year.
Safety Precautions
Prior to installing or operating the Aprilaire 800 steam humidifier, carefully review all safety precautions outlined in the provided manual. Electrical connections should always be performed by a qualified professional to prevent shock hazards. Ensure the unit is properly grounded and adheres to local electrical codes. Water supply connections must be secure to avoid leaks and potential water damage.

The steam produced can cause burns; exercise caution when near the humidifier, especially for children and pets. Regularly inspect the unit for any signs of damage or malfunction, and discontinue use if issues are detected. Do not attempt to repair the humidifier yourself; refer to qualified service personnel. Following these guidelines, detailed in the owner’s manual, will ensure safe and reliable operation.

Installation and Setup
Proper installation, detailed in the manual, requires professional expertise, correct water supply connections, and adherence to all applicable electrical connection guidelines.

Professional Installation Recommended
Due to the complexities involved in steam humidifier installation, Aprilaire strongly recommends engaging a qualified HVAC professional for the setup of your 800 series unit. Improper installation can lead to inefficient operation, potential water damage, or even safety hazards. A professional will ensure correct placement, considering factors like ductwork accessibility and proximity to the water supply and electrical connections.
They possess the necessary tools and expertise to handle the plumbing and electrical work safely and according to local codes. The installation manual provides detailed instructions, but interpreting these requires specialized knowledge. A professional can accurately assess your home’s specific needs and configure the humidifier for optimal performance, guaranteeing a smooth and reliable operation for years to come. Don’t compromise on quality – choose professional installation.
Water Supply Requirements

The Aprilaire 800 steam humidifier necessitates a dedicated, cold water supply line, typically a ½-inch copper or PEX tubing. Water pressure must fall within the range of 20 to 80 PSI for optimal performance; a pressure regulator may be required if your home’s water pressure exceeds this limit. The water source should be potable and free from contaminants that could damage the unit or affect air quality.
Avoid using softened water, as the minerals can cause scaling within the humidifier. A drain line is also crucial for expelling excess water during operation and flushing. Ensure the drain line is adequately sized and routed to a suitable drain location, preventing backflow or standing water. Proper water supply installation is vital for the humidifier’s longevity and efficient operation.
Electrical Connections
The Aprilaire 800 steam humidifier requires a dedicated 120V, 60Hz electrical circuit. It’s strongly advised that a qualified electrician performs all electrical connections, adhering to local and national electrical codes. The unit typically needs a grounded three-prong outlet. Avoid using extension cords or adapters, as they can pose a safety hazard and potentially damage the humidifier.
Before commencing any electrical work, ensure the power supply to the circuit is completely switched off at the breaker panel. Proper grounding is essential for safety and to prevent electrical shock. Verify the wiring is secure and correctly connected to the designated terminals within the humidifier’s electrical compartment. Incorrect wiring can lead to malfunction or fire risk.

Operation and Control
The Aprilaire 800 offers both manual and automatic control modes, allowing users to adjust humidity levels and manage condensation effectively for optimal comfort.
Understanding the Control Panel
The Aprilaire 800’s control panel is the central hub for managing your humidifier’s operation. It allows for precise adjustments to humidity settings and monitoring of system performance. Familiarizing yourself with its features is crucial for efficient use.
The panel typically displays current humidity levels, setpoints, and operational status. Manual mode allows direct control over the steam output, while automatic mode utilizes pre-programmed settings or user-defined preferences. Adjusting the setpoint influences the desired humidity level within your home.
Pay attention to indicators related to water levels and system alerts. The control panel may also feature condensation control settings, enabling you to minimize moisture buildup on windows and walls. Understanding these functions ensures optimal performance and prevents potential issues. Refer to the full manual for detailed explanations of each control and indicator.
Manual Mode Operation
In Manual Mode, you directly control the steam output of the Aprilaire 800, overriding automatic settings. This mode is useful for precise humidity adjustments or temporary overrides. The control panel will display a setting, often a numerical value, representing the steam output level.
Adjusting this setting increases or decreases the amount of steam generated. It’s crucial to monitor indoor humidity levels closely when using Manual Mode to avoid over-humidification and condensation. Consider outdoor temperatures; colder temperatures require lower settings to prevent window issues.
The manual suggests adjusting the setting based on outdoor temperature – for example, 35 at 20°F, reducing to 25 if temperatures fall to 0°F. Regularly check for condensation and adjust accordingly. This mode offers maximum control but requires diligent monitoring.
Automatic Mode Operation
Automatic Mode on the Aprilaire 800 streamlines humidity control by self-adjusting steam output based on indoor and outdoor conditions. The humidifier intelligently responds to temperature and humidity fluctuations, maintaining a pre-set humidity level without constant user intervention.
This mode relies on sensors to monitor the environment and optimize performance. While convenient, it’s still important to initially set the desired humidity level accurately. The system then works to maintain that level, adjusting steam production as needed.
Regularly check for proper operation and ensure the system isn’t overcompensating, potentially leading to condensation. Automatic mode provides a balance between convenience and efficient humidity management, simplifying daily operation.

Maintenance and Troubleshooting
Regular upkeep, including filter replacements and addressing common issues, ensures optimal performance and longevity of your Aprilaire 800 steam humidifier system.
Regular Maintenance Schedule
Establishing a consistent maintenance routine is crucial for the sustained efficiency and reliability of your Aprilaire 800 steam humidifier. A key component involves routinely checking the water panel; scaling can occur, diminishing humidification capacity. Inspect this component monthly, and descale as needed following the detailed instructions within the owner’s manual.
Furthermore, the humidifier’s water reservoir should be inspected periodically for sediment buildup. Flushing the reservoir annually helps maintain water quality and prevents potential issues. Filter replacement is also vital; consult the manual for the recommended frequency, typically every six to twelve months, depending on water quality.
Finally, a visual inspection of all connections – water lines and electrical – should be performed at least twice yearly to identify any leaks or damage. Adhering to this schedule will minimize downtime and maximize the lifespan of your humidifier.
Filter Replacement Procedures
Replacing the filter in your Aprilaire 800 steam humidifier is a straightforward process, vital for maintaining optimal performance and air quality. Begin by disconnecting power to the unit at the breaker to ensure safety. Locate the filter access panel, typically on the unit’s side or bottom, and remove it. Carefully remove the old filter, noting its orientation for correct installation of the new one.
Before inserting the replacement filter, inspect the filter housing for any debris or buildup and clean as necessary. Install the new filter, ensuring it’s properly seated and oriented as indicated. Reattach the filter access panel securely.
Finally, restore power to the unit. The frequency of filter replacement depends on water quality, but generally, every six to twelve months is recommended. Refer to your owner’s manual for specific filter type and detailed instructions.
Troubleshooting Common Issues
Encountering issues with your Aprilaire 800? Several common problems have relatively simple solutions. If the humidifier isn’t producing steam, verify the water supply is connected and the unit is receiving power. Check for error codes on the control panel, referencing the manual for their meaning. Low humidity output could indicate a clogged filter – replace it as needed.
Condensation around the unit often signals excessively high humidity settings; adjust accordingly, especially during colder months. Unusual noises might point to a problem with the water solenoid or fan; professional inspection is advised.
Always consult the owner’s manual for a comprehensive troubleshooting guide and safety precautions before attempting any repairs. If issues persist, contact a qualified HVAC technician.

Advanced Settings and Adjustments
Fine-tune your Aprilaire 800 with humidity level, condensation control, and seasonal adjustments for optimal performance and comfort throughout the year.
Humidity Level Adjustment
Adjusting the humidity level on your Aprilaire 800 is crucial for maintaining a comfortable and healthy indoor environment. The control panel allows for precise settings, typically displayed as a percentage representing the desired relative humidity.
Begin by considering the outdoor temperature; colder temperatures necessitate higher humidity settings to counteract the drying effects of heating systems. A setting of 35-40% is often recommended during winter months, but individual preferences and potential condensation issues should guide your choice.
To avoid excessive condensation, especially on windows, gradually increase or decrease the setting and monitor the results. The manual suggests reducing the setting if condensation appears, particularly when outdoor temperatures drop significantly. Regularly observe your home’s humidity levels with a separate hygrometer for accurate readings and optimal adjustments.
Condensation Control Settings
The Aprilaire 800 features settings designed to minimize condensation, a common concern with whole-house humidification. These controls work in conjunction with humidity level adjustments, responding to both indoor and outdoor temperature fluctuations.
The manual emphasizes proactively reducing the humidity setting as outdoor temperatures decrease, anticipating potential condensation build-up. For example, lowering the setpoint from 35% to 25% before a significant temperature drop can prevent issues.
Observe windows and exterior walls for signs of moisture. If condensation appears, immediately lower the humidity setting. The system’s automatic mode can also assist, adjusting output based on pre-programmed parameters. Consistent monitoring and fine-tuning are key to balancing humidity levels and preventing unwanted condensation throughout the seasons.

Seasonal Adjustments
Adapting your Aprilaire 800’s settings to changing seasons is crucial for optimal performance and energy efficiency. As winter approaches and outdoor temperatures drop, increasing the humidity setting becomes necessary to counteract the drying effects of heating systems.
Conversely, during warmer months, reducing humidity levels prevents excessive moisture and potential condensation. The manual suggests a proactive approach: anticipate seasonal shifts and adjust settings before significant weather changes occur.
Regularly assess indoor humidity levels using a hygrometer. Consider the building’s insulation and air tightness when making adjustments. Consistent monitoring and fine-tuning throughout the year ensure comfortable indoor air quality and prevent potential issues like mold growth or structural damage.

Technical Specifications
The Aprilaire 800 series details dimensions, weight, water consumption rates, and electrical requirements—all vital for proper installation and operational understanding.
Dimensions and Weight
Understanding the physical characteristics of the Aprilaire 800 steam humidifier is crucial for ensuring proper placement and installation within your home’s HVAC system. While specific dimensions can vary slightly depending on the exact model within the 800 series, generally, these units are designed to integrate seamlessly into existing ductwork.
Typical dimensions require adequate space within the air handler or duct system for both the humidifier unit itself and the associated water supply connections. Weight is also a consideration, as the unit, when filled with water, can be substantial.
Precise measurements are available in the official Aprilaire 800 series owner’s manual and installation guides, which are readily accessible online in PDF format. These documents provide detailed specifications to assist with planning and a successful installation process, preventing potential compatibility issues.
Water Consumption Rates
Determining the Aprilaire 800 steam humidifier’s water usage is vital for managing household water resources and anticipating potential impacts on water bills. Water consumption is directly linked to the humidifier’s output capacity and the selected humidity settings.
The amount of water used will fluctuate based on factors like the home’s existing humidity levels, the desired humidity setting, and the outdoor temperature. Generally, steam humidifiers utilize more water than evaporative models to achieve the same humidity increase.
Detailed water consumption rates, expressed in gallons per day (GPD), are outlined in the official Aprilaire 800 series documentation, available as downloadable PDF manuals. These resources provide specific data to help homeowners estimate water usage and optimize humidifier settings for efficiency.
Electrical Requirements
Proper electrical setup is crucial for the safe and effective operation of the Aprilaire 800 steam humidifier. Incorrect wiring or insufficient power supply can lead to malfunction, damage, or even pose a safety hazard.
The Aprilaire 800 typically requires a dedicated 120V or 240V electrical circuit, depending on the specific model and its output capacity. Refer to the unit’s data plate and the official installation manual (available as a PDF) for precise voltage and amperage specifications.
Installation should always be performed by a qualified electrician, ensuring compliance with local electrical codes. The electrical connection must be properly grounded, and a suitable circuit breaker should be installed to protect against overloads. Never attempt electrical work without proper training and safety precautions.
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