aprilaire 700 automatic humidifier installation manual
Article Plan: AprilAire 700 Automatic Humidifier Installation Manual
This comprehensive guide details the installation of the AprilAire 700, focusing on HVAC efficiency, air quality, and system integration for optimal home comfort.
The AprilAire 700 Automatic Humidifier represents a significant advancement in whole-house humidity control, designed to seamlessly integrate with your existing HVAC system. This manual provides detailed instructions for a successful installation, ensuring balanced humidity levels throughout your home, regardless of size or construction tightness. AprilAire prioritizes Indoor Air Quality (IAQ), and the 700 is a key component of the broader AprilAire Healthy Air System.
This system addresses ventilation, filtration, humidity, radon, zoning, IAQ control, and UVC sanitization. By maintaining optimal humidity, the AprilAire 700 helps mitigate allergy and asthma triggers, reduces mold and mildew growth, and enhances overall comfort. Proper installation, as outlined in this manual, is crucial for maximizing performance and realizing the full benefits of this advanced humidifier.

Safety Precautions
Prior to commencing installation, carefully review these safety precautions to prevent injury and ensure proper system operation. Disconnect power to your furnace before beginning any electrical work. Always wear appropriate safety glasses and gloves during installation. Improper wiring can create a fire hazard or damage the humidifier and furnace.

Exercise caution when working with water lines; ensure a secure connection to prevent leaks and potential water damage. If you are unfamiliar with plumbing or electrical work, consult a qualified HVAC professional. Failure to follow these guidelines could void the warranty and compromise the safety of your home and family. Always adhere to local building codes and regulations.
Tools and Materials Required
Successful AprilAire 700 installation necessitates specific tools and materials. You will need a screwdriver set (Phillips and flathead), wire strippers/crimpers, adjustable wrench, pipe cutter (for saddle valve installation), drill with appropriate bits, and a level. Essential materials include the AprilAire 700 humidifier unit, water supply connection components (saddle valve or copper/PEX fittings), drain line tubing, electrical wiring connectors, and appropriate gauge wire.
A Teflon tape roll for sealing water connections is also crucial. Depending on your setup, you may require a direct water line connection kit. Ensure you have a MERV-rated filter readily available for initial setup.
Understanding the AprilAire 700 Components
The AprilAire 700 system comprises several key components working in harmony. The humidifier unit itself houses the evaporative pad and water distribution system. Water supply connections, utilizing either a saddle valve or direct line, deliver water to the unit. The control panel manages humidity levels and system operation, requiring careful wiring to the furnace for power and signal integration.

Understanding these components – the unit’s internal workings, the water feed, and the electrical connections – is vital for a smooth installation. Proper component interaction ensures optimal humidity control and overall system performance.
Humidifier Unit Overview
The AprilAire 700 humidifier unit is designed for efficient whole-house humidity control. It features a robust housing containing the evaporative pad, responsible for absorbing water and releasing moisture into the airflow. A water distribution system evenly wets the pad, maximizing evaporation. The unit integrates seamlessly with your HVAC system, utilizing the furnace fan to distribute humidified air throughout your home.
Its construction prioritizes durability and ease of maintenance. Familiarizing yourself with the unit’s internal layout – including the pad, water distribution components, and airflow pathways – is crucial for successful installation and long-term operation.
Water Supply Connection Components
Essential components for connecting the AprilAire 700 to your water supply include a saddle valve or a direct water line connection. The saddle valve clamps onto an existing copper or CPVC water pipe, piercing it to provide a water source. Alternatively, a direct connection involves installing a dedicated water line with a shut-off valve.
A flexible water tube connects from the valve to the humidifier unit. Proper fittings and Teflon tape are vital to prevent leaks. Consider a water filter to minimize mineral buildup within the humidifier, extending its lifespan and maintaining optimal performance. Careful selection and installation of these components are key.
Control Panel and Wiring
The AprilAire 700’s control panel manages humidity levels and system operation, typically integrating with your furnace’s existing wiring. Wiring usually involves a low-voltage connection to the furnace control board, enabling the humidifier to activate during heating cycles. A transformer may be required to provide the correct voltage.
Carefully follow the wiring diagram provided with the unit, paying close attention to color codes. Secure connections are crucial for reliable operation. The control panel allows for adjustable humidity settings and often includes indicators for system status and filter replacement reminders. Proper wiring ensures seamless integration and efficient humidity control.
Pre-Installation Checklist
Before beginning, verify compatibility with your HVAC system and confirm the availability of a suitable water supply and electrical connection. Ensure you have all necessary tools and materials, including the humidifier unit, water supply components, wiring connectors, and mounting hardware.

Inspect the installation location for adequate space and accessibility for future maintenance. Review the local building codes and regulations regarding humidifier installations. Confirm the furnace is powered off during installation to prevent electrical hazards. A thorough pre-installation check streamlines the process and ensures a safe, effective setup.
Choosing the Installation Location
Select a location near the furnace and a water supply line for efficient operation and minimal plumbing. Ensure sufficient space around the unit for maintenance, filter changes, and potential repairs – accessibility is key. Avoid areas prone to freezing temperatures to prevent water line damage and system malfunction.
Consider the proximity to the return air duct for optimal humidity distribution throughout the home. The location should also allow for a proper drain line connection, directing water away from electrical components. Prioritize a stable, level surface to minimize vibration and noise during operation, contributing to a quieter, more comfortable home environment.

Connecting the Water Supply
Proper water supply connection is crucial for the AprilAire 700’s functionality. You have two options: saddle valve installation or a direct water line connection. Saddle valves are simpler but may reduce water pressure; ensure a tight seal to prevent leaks. Direct connections offer consistent pressure but require cutting into the existing water line – professional installation is recommended.
Always use approved fittings and Teflon tape to create watertight connections. Before connecting, flush the water line to remove any debris. Regularly inspect the connection for leaks after installation and during routine maintenance. A reliable water supply ensures consistent humidity control and optimal performance of your AprilAire humidifier.
Saddle Valve Installation
Saddle valve installation provides a simpler water connection method for the AprilAire 700. Carefully select a suitable location on a copper water pipe, avoiding areas with corrosion. Drill a hole according to the valve’s instructions, ensuring it’s clean and free of burrs. Attach the saddle valve, tightening the bolts evenly to create a secure seal.
Connect the humidifier’s water supply tubing to the valve’s outlet; Monitor closely for leaks after initial connection and during the first few operational cycles. While convenient, saddle valves can sometimes reduce water pressure; regular inspection is vital for optimal performance and to prevent potential water damage.
Direct Water Line Connection
For a more reliable and higher-flow water supply, a direct water line connection is recommended for the AprilAire 700. This involves cutting into an existing copper or PEX water line and installing a dedicated tee fitting. Use appropriate plumbing tools and techniques to ensure a watertight seal, employing solder for copper or crimp/push-fit connectors for PEX.
Connect the humidifier’s water supply tubing to the tee fitting. This method generally provides consistent water pressure, crucial for optimal humidifier operation. Always adhere to local plumbing codes and consider professional assistance if you’re unfamiliar with plumbing work.
Mounting the Humidifier Unit
Securely mounting the AprilAire 700 is critical for stable operation and preventing vibrations. Typically, the unit is mounted directly to the furnace plenum or a nearby structural support using screws and mounting brackets provided. Ensure the mounting surface is level and capable of supporting the humidifier’s weight when full of water.

Maintain adequate clearance around the unit for servicing and filter changes. Avoid mounting near heat sources or areas prone to moisture. Proper mounting minimizes noise and ensures the humidifier functions efficiently as part of your AprilAire Healthy Air System.

Connecting the Drain Line
Proper drain line connection is essential to prevent water damage and maintain humidifier functionality. The AprilAire 700 requires a drain line to safely discharge excess water produced during humidification. Connect the provided drain tubing to the humidifier’s drain outlet and route it to a suitable floor drain, standpipe, or condensate pump.
Ensure the drain line has a continuous downward slope to facilitate drainage and prevent water from pooling; Avoid kinks or sharp bends. Secure the drain line to prevent accidental disconnections, contributing to the overall health of your home’s Indoor Air Quality.
Electrical Wiring
Safe and correct electrical wiring is paramount for the AprilAire 700’s operation and your safety. Always disconnect power to the furnace before commencing any electrical work. The humidifier requires a dedicated power supply, typically sourced from the furnace’s control board.
Follow the wiring diagram provided with the unit carefully, connecting the appropriate wires to the designated terminals. Ensure all connections are secure and comply with local electrical codes. Incorrect wiring can damage the humidifier or create a fire hazard, impacting the entire Healthy Air System.
Wiring to the Furnace
Connecting the AprilAire 700 to your furnace’s control board provides power and enables integrated operation. Typically, a 24V AC power source is utilized. Locate the humidifier terminal on the furnace control board – consult your furnace manual if needed. Connect the humidifier’s wiring harness to this terminal, ensuring a secure connection.
Proper wiring allows the furnace to signal the humidifier when to activate during heating cycles, maintaining consistent humidity levels. Double-check all connections before restoring power, verifying adherence to the wiring diagram. Incorrect connections can disrupt furnace operation or damage the humidifier.
Power Supply Requirements
The AprilAire 700 humidifier operates on a standard 24V AC power supply, typically sourced directly from the furnace’s control board. A dedicated transformer isn’t usually required, simplifying installation. However, ensure the furnace’s power supply has sufficient capacity to accommodate the humidifier’s draw.
Verify the voltage matches the humidifier’s specifications to prevent damage. If a dedicated power source is necessary, consult a qualified electrician for proper installation. Always disconnect power to the furnace before making any electrical connections, prioritizing safety during the installation process.
Control Panel Installation and Setup
Mount the AprilAire 700 control panel in a readily accessible location, away from direct moisture or heat sources. Securely attach it using the provided screws, ensuring a level installation for accurate readings. Connect the low-voltage wiring from the humidifier unit and the furnace, following the wiring diagram carefully.
Once connected, power up the system and navigate the control panel’s menu to set your desired humidity levels. Familiarize yourself with the panel’s features, including manual override and diagnostic functions. Proper setup ensures optimal performance and allows for personalized humidity control within your home.
Initial System Startup and Testing
After completing the installation, initiate the AprilAire 700 system by turning on the furnace and verifying power to the humidifier. Observe the water supply connection for any leaks, tightening connections as needed. Monitor the humidifier unit during its initial cycle to confirm proper water intake and evaporation.
Check the control panel display for error messages, addressing any issues promptly. Allow the system to run for several hours, observing humidity levels to ensure it’s functioning as expected. This initial testing phase is crucial for identifying and resolving any potential problems before long-term use.
Setting Humidity Levels
The AprilAire 700 allows precise humidity control for optimal comfort and health. Utilize the control panel to select your desired humidity percentage, typically between 30-50%, adjusting based on seasonal changes and personal preference. Lower humidity levels in winter prevent condensation, while higher levels in summer enhance comfort.
Monitor indoor humidity using a separate hygrometer to verify accuracy. Consider the construction tightness of your home; tighter homes require lower humidity settings. Maintaining balanced humidity reduces allergy and asthma triggers, protecting your family’s well-being and ensuring a healthy indoor environment.

Filter Replacement
Regular filter replacement is crucial for maintaining optimal air quality and humidifier performance. AprilAire offers four filter types: Clean Air, Healthy Home, Odor Reduction, and Allergy & Asthma, each designed for specific needs. Filter lifespan varies based on usage and air quality, typically 6-12 months.
MERV ratings indicate filter effectiveness; higher MERV ratings trap smaller particles. Inspect filters monthly and replace when visibly dirty. Proper filter maintenance reduces maintenance costs and extends the life of your AprilAire system, contributing to a healthier home environment and efficient operation.
Filter Types (Clean Air, Healthy Home, Odor Reduction, Allergy & Asthma)
AprilAire provides specialized filters to address diverse indoor air quality concerns. Clean Air filters capture basic dust and pollen. Healthy Home filters offer broader protection, reducing allergens and odors. Odor Reduction filters target volatile organic compounds (VOCs) and unpleasant smells.

Allergy & Asthma filters provide the highest level of filtration, capturing microscopic particles that trigger sensitivities. Selecting the right filter depends on your specific needs and sensitivities, ensuring a healthier and more comfortable living space. Consider your home environment and potential allergens when choosing a filter type.
MERV Ratings Explained
MERV (Minimum Efficiency Reporting Value) indicates a filter’s ability to capture airborne particles. Higher MERV ratings signify better filtration, trapping smaller particles like bacteria and viruses. AprilAire filters are MERV rated, allowing you to select the appropriate level for your needs.
Lower MERV ratings (1-4) capture larger particles like dust and pollen, while higher ratings (8-13) capture smaller particles like mold spores and pet dander. Choosing a higher MERV rating can improve air quality but may reduce airflow; balance filtration with HVAC system performance.
Troubleshooting Common Issues
If your AprilAire 700 isn’t functioning correctly, first check the water supply connection and ensure the saddle valve or direct line is unobstructed. Verify the drain line isn’t clogged, preventing proper water discharge. Electrical connections should be secure, and the furnace compatibility confirmed.
Low humidity output might indicate a dirty filter – replace it promptly. If the control panel isn’t responding, check the power supply and wiring. For persistent issues, consult a Healthy Air Professional; their expertise ensures accurate diagnosis and repair, maintaining optimal system performance and indoor air quality.
Maintaining Optimal Performance
To ensure your AprilAire 700 consistently delivers healthy, balanced humidity, regular maintenance is crucial. Prioritize timely filter replacements – selecting the appropriate type (Clean Air, Healthy Home, Odor Reduction, or Allergy & Asthma) based on your needs. Inspect the water supply line and drain line quarterly for leaks or obstructions.
Annual professional inspection by a Healthy Air Professional is recommended to assess overall system health and address potential issues proactively. Consistent upkeep extends the humidifier’s lifespan, reduces energy consumption, and guarantees continued effectiveness within the AprilAire Healthy Air System;
AprilAire Healthy Air System Integration
The AprilAire 700 seamlessly integrates into the comprehensive AprilAire Healthy Air System, a holistic approach to indoor air quality. This system combines fresh air ventilation, advanced air filtration, precise humidity control, and even radon mitigation for a healthier home environment.
Integrating the 700 with zoning and IAQ control enhances comfort and efficiency, while optional UVC sanitization further reduces airborne viruses and allergens. By addressing all aspects of IAQ, the Healthy Air System creates a superior living space, protecting against asthma triggers and promoting overall well-being.
Finding a Healthy Air Professional
For optimal AprilAire 700 installation and system integration, consider partnering with a certified Healthy Air Professional. AprilAire boasts a network of over 4,500 pros nationwide, equipped to assess your home’s specific needs and recommend tailored solutions.
These professionals can expertly handle installation, ensuring proper wiring, water line connections, and control panel setup. They also offer valuable insights into maximizing the benefits of the Healthy Air System, including filter selection and humidity level optimization. Locate a trusted pro through the AprilAire website to establish a truly healthy home.
Dehumidifier Considerations (Related Products)
While the AprilAire 700 focuses on humidity control through humidification, maintaining balanced indoor humidity year-round may necessitate a dehumidifier. AprilAire Dehumidifiers effectively reduce mold and mildew-causing moisture, protecting against allergy and asthma symptoms.
Consider a dehumidifier if your home experiences excessive humidity, particularly during warmer months. Integrating an AprilAire dehumidifier with your 700 humidifier creates a comprehensive indoor air quality solution. This combination ensures optimal comfort and a healthier living environment, addressing both dry winter air and damp summer conditions.
Warranty Information and Support
AprilAire stands behind the quality of the 700 Automatic Humidifier with a comprehensive warranty, details of which are included with your purchase. This warranty covers defects in materials and workmanship under normal use and proper installation. For warranty claims or support, please retain your proof of purchase and contact AprilAire directly.
AprilAire also boasts a network of over 4,500 Healthy Air Professionals nationwide, ready to assist with installation, maintenance, and troubleshooting. Visit the AprilAire website to locate a professional near you. Dedicated customer support is available through phone and online resources, ensuring a positive ownership experience.