aprilaire model 700 installation manual
Welcome to the Aprilaire 700 Installation Manual. This guide provides comprehensive instructions for installing, operating, and maintaining your humidifier, ensuring optimal performance and efficiency for years to come.
Overview of the Aprilaire Model 700 Humidifier
The Aprilaire Model 700 is a high-efficiency whole-house humidifier designed to provide optimal indoor air quality by maintaining a healthy humidity level. It is engineered to work seamlessly with HVAC systems, ensuring consistent moisture distribution throughout your home. This model is known for its digital control system, which allows for precise humidity management. The humidifier is compatible with both manual and automatic control options, offering flexibility for different user preferences. Its compact design makes it suitable for various installation locations, while its durable construction ensures long-term reliability. The Model 700 is also eco-friendly, using less water compared to traditional humidifiers. With its advanced features and user-friendly interface, the Aprilaire Model 700 is a popular choice for homeowners seeking to enhance indoor comfort and air quality. Regular maintenance ensures optimal performance and extends the lifespan of the unit.
Importance of Proper Installation
Proper installation of the Aprilaire Model 700 humidifier is crucial for ensuring optimal performance, safety, and efficiency. Incorrect installation can lead to issues such as improper humidity levels, water damage, or even electrical hazards. A well-installed system ensures consistent moisture distribution, prevents over-humidification, and reduces the risk of mold growth. Additionally, proper installation guarantees compliance with safety standards and manufacturer guidelines, which are essential for maintaining warranty validity. Correct wiring and connections are critical to avoid electrical malfunctions, while proper drainage setup prevents water leakage and potential damage to your home. By following the installation manual carefully, you can ensure the humidifier operates efficiently, providing long-term comfort and air quality benefits. Proper installation also minimizes the need for frequent repairs and extends the lifespan of the unit, making it a worthwhile investment for your home’s health and comfort.
Key Features of the Aprilaire Model 700
The Aprilaire Model 700 is a high-performance humidifier designed to provide precise humidity control for residential spaces. It features a digital control system that automatically adjusts moisture levels based on outdoor temperatures, ensuring optimal comfort and energy efficiency. The unit is compatible with both manual and automatic control options, offering flexibility for different installation scenarios. One of its standout features is the outdoor temperature sensor, which allows the humidifier to adapt to changing conditions, preventing over-humidification. The Model 700 also boasts a robust design with a built-in bypass damper, making it suitable for various HVAC configurations. Its compact size and dual-installation options (supply or return duct mounting) provide versatility for different home layouts. Additionally, the system is designed for quiet operation and minimal maintenance, making it a reliable choice for whole-house humidity management.

Pre-Installation Requirements and Preparation
Ensure you have all necessary tools and materials. Understand the installation location and safety precautions. Prepare the area for a smooth and efficient setup process.
Tools and Materials Needed for Installation
To ensure a successful installation of the Aprilaire Model 700, gather the necessary tools and materials. Basic tools include a drill, screwdrivers, pliers, and wrenches. Materials required are water tubing, electrical connectors, and mounting hardware. Additional items like a drain pan and transformer may be needed depending on your setup. Ensure all components are compatible with the humidifier and your HVAC system. Having these tools and materials ready will streamline the installation process and prevent delays. Refer to the manual for specific requirements to avoid missing any critical items.
Understanding the Installation Location
Choosing the right location for your Aprilaire Model 700 is crucial for optimal performance. The humidifier can be installed on either the supply or return duct, depending on your HVAC system setup. Ensure the location provides easy access for maintenance and adjustments. Ideally, the unit should be placed near the furnace to minimize ductwork modifications. Avoid areas exposed to direct sunlight or extreme temperatures, as this may affect humidity levels. For bypass models, installation on the return duct is recommended, while fan-powered models can be placed on the supply duct. Proper placement ensures efficient operation and even humidity distribution throughout your home. Always follow the manufacturer’s guidelines for specific installation requirements to guarantee reliable performance and longevity of the system.
Pre-Installation Checks and Safety Precautions

Before installing the Aprilaire Model 700, ensure the system is compatible with your HVAC setup and verify the power supply requirements. Turn off the power to the furnace and humidifier at the circuit breaker to avoid electrical hazards. Wear protective gear, including gloves and safety glasses, when handling sharp edges or electrical components. Inspect the ductwork for any damage or obstructions that could interfere with installation. Ensure proper ventilation in the installation area to prevent moisture buildup. Familiarize yourself with local building codes and manufacturer guidelines to avoid safety risks. Double-check all connections and wiring before restoring power. Proper preparation and adherence to safety protocols ensure a smooth and secure installation process, minimizing potential hazards and ensuring long-term efficiency. Always refer to the manual for specific safety instructions tailored to the Model 700.
Installation Process for Aprilaire Model 700
Mount the humidifier, connect water supply and drainage, install the outdoor temperature sensor, and wire the control system. Ensure all connections are secure and perform final checks for proper operation.
Step-by-Step Guide to Mounting the Humidifier
Begin by preparing the installation site, ensuring it is clean and level. Unpack the Aprilaire Model 700 humidifier and its components. Position the unit according to the recommended location, typically near the furnace. Use the provided mounting template to mark the wall or floor for secure installation. Drill pilot holes and anchor the mounting brackets firmly. Place the humidifier on the brackets, ensuring it is level and plumb. Tighten all screws securely to prevent vibration or movement. Double-check the alignment and stability before proceeding to the next steps. Proper mounting is essential for efficient operation and to avoid potential damage or noise during use.
Connecting the Water Supply and Drainage System
To connect the water supply, turn off the main water supply and locate a suitable water line. Install a saddle valve or dedicated water line to the humidifier’s inlet. Use PEX tubing or copper piping, ensuring all connections are secure and leak-free. For drainage, attach the provided drain kit to the humidifier’s drain outlet. Route the drain line to a nearby floor drain or condensate pump, avoiding any traps or sags. Use a check valve if required to prevent backflow; Tighten all fittings and test the system by running water through it to check for leaks. Properly connecting these systems ensures efficient operation and prevents water damage or mold growth. Follow local plumbing codes and manufacturer recommendations for a safe and reliable setup.
Installing the Outdoor Temperature Sensor

Install the outdoor temperature sensor in a shaded area, such as a north- or east-facing wall, to avoid direct sunlight interference. Mount the sensor at least 3 feet above ground level to ensure accurate temperature readings. Use the provided screws or clips to secure the sensor to the exterior wall. Connect the sensor wires to the humidifier control system, following the wiring diagram in the manual. Ensure the sensor is properly sealed to protect it from moisture and extreme weather conditions. After installation, test the sensor by observing the humidifier’s response to temperature changes. Proper installation ensures the humidifier operates efficiently, adjusting moisture levels based on outdoor conditions. Refer to the manual for specific wiring connections and placement recommendations to optimize performance and accuracy. This step is critical for maintaining proper humidity levels in your home.
Wiring the Humidifier Control System
Wiring the Aprilaire Model 700 control system requires careful attention to ensure proper functionality. Begin by connecting the power cord to a dedicated 120V electrical circuit, following the wiring diagram provided in the manual. Ensure the circuit is turned off before starting any wiring work. Connect the sensor wires from the outdoor temperature sensor to the control board, securing them tightly to avoid loose connections. For manual control, wire the humidifier directly to the furnace blower motor, while automatic control requires integration with your HVAC system. Refer to the wiring diagram for specific terminal connections. Double-check all wires for proper insulation and secure them with cable ties to prevent damage. After completing the wiring, turn the power on and test the system to ensure it responds correctly to temperature changes and humidity levels. Proper wiring ensures efficient and safe operation of the humidifier. Always follow safety guidelines to avoid electrical hazards.
Final Installation Checks and Adjustments
After completing the installation, perform a thorough inspection to ensure all components are correctly connected and functioning. Verify that the humidifier is properly mounted, the water supply and drainage systems are leak-free, and the outdoor temperature sensor is accurately installed. Check the wiring connections to confirm they match the wiring diagram in the manual. Test the humidifier by running it through a full cycle to ensure it humidifies and drains water effectively. Adjust the humidity settings as needed to achieve the desired comfort level. Refer to the control installation manual for system checkout instructions. Ensure all safety precautions, such as proper electrical connections and secure mounting, are in place. Finally, review the maintenance instructions to prepare for future upkeep. Proper final checks ensure the Aprilaire Model 700 operates efficiently and safely, providing reliable humidity control for your home. Always follow the manufacturer’s guidelines for optimal performance.

Wiring Diagrams and Electrical Connections
The wiring diagrams provide a clear guide for connecting the Aprilaire Model 700’s electrical components, ensuring safe and efficient installation of both manual and automatic control options.
Understanding the Wiring Diagram for Model 700
The wiring diagram for the Aprilaire Model 700 illustrates the recommended connections for detecting furnace operation and integrating the humidifier with your HVAC system. It outlines the proper wiring for both manual and automatic control modes, ensuring compatibility with various furnace types. The diagram specifies how to connect the power cord, sensors, and control systems safely and efficiently. By following the diagram, you can avoid electrical issues and ensure the humidifier operates seamlessly with your home’s heating and cooling setup. Proper wiring is crucial for optimal performance and energy efficiency, making the diagram an essential tool during installation.
Connecting the Power Cord and Electrical Components
Connecting the power cord and electrical components for the Aprilaire Model 700 requires careful attention to ensure safe and proper installation. Begin by locating the power cord and identifying the appropriate electrical connections outlined in the wiring diagram. Connect the power cord to the designated terminal on the humidifier control system, ensuring compatibility with your HVAC setup. Avoid connecting the power cord to multi-speed furnace blower motors, as this can lead to operational issues. Refer to the control installation manual for specific instructions on integrating the humidifier with your furnace. Proper electrical connections are critical for the humidifier to function efficiently and safely. Always follow the manufacturer’s guidelines and consult a licensed electrician if unsure about any step in the process.

Wiring the Manual and Automatic Control Options
Wiring the Aprilaire Model 700 involves configuring either manual or automatic control options based on your preference and HVAC system requirements. For manual control, connect the wires according to the wiring diagram, ensuring the humidifier operates independently. Automatic control requires integrating the humidifier with your furnace or HVAC system, using the provided wiring harness. Refer to the control installation manual for specific instructions on connecting sensors and relays. Ensure all connections are secure and compatible with your system’s voltage requirements. Proper wiring ensures seamless operation, whether in manual or automatic mode. Always follow safety guidelines and consult a professional if unsure about any step. This setup ensures efficient humidity control and optimal performance year-round.
Maintenance and Troubleshooting

Regular maintenance ensures optimal performance. Clean the humidifier, check water flow, and inspect electrical connections. Troubleshoot issues like low humidity or malfunction by checking sensors and resetting the system.
Regular Maintenance Tasks for Optimal Performance
Regular maintenance is crucial for ensuring the Aprilaire Model 700 operates efficiently. Clean the water panel and drain system monthly to prevent mineral buildup and bacterial growth. Check the water flow rate and adjust if necessary to maintain proper humidity levels. Inspect electrical connections and wiring for damage or wear. Replace the humidifier pad annually or as recommended to ensure optimal performance. Additionally, monitor the outdoor temperature sensor to ensure accurate readings, which are essential for proper humidification control. Finally, reset the humidifier control system periodically to restore default settings and address any operational issues. By following these maintenance tasks, you can extend the lifespan of your Aprilaire Model 700 and ensure it continues to provide reliable performance.

Troubleshooting Common Issues with the Model 700
Troubleshooting the Aprilaire Model 700 involves identifying and addressing common issues promptly. One frequent problem is water leakage, often caused by improper installation or clogged drain lines. Ensure all connections are secure and clean the drain system regularly. Another issue is low humidity output, which may result from a faulty humidistat or incorrect water flow settings. Check and adjust the humidistat calibration and verify water flow rates. Additionally, if the humidifier fails to turn on, inspect the electrical connections and wiring for damage or loose contacts. If the outdoor temperature sensor malfunctions, it may cause inaccurate humidity readings. Clean or replace the sensor as needed. Finally, if the system resets frequently, check for power supply issues or software glitches. Addressing these common issues ensures consistent performance and extends the lifespan of your Aprilaire Model 700 humidifier.
Resetting the Humidifier Control System
Resetting the Aprilaire Model 700 humidifier control system is a straightforward process designed to restore default settings and resolve operational issues. Begin by switching off the power supply to the humidifier at the circuit breaker or fuse box. Wait for 30 seconds to ensure all components are fully powered down. Next, locate the reset button on the control panel, typically found near the humidistat or digital display. Press and hold the reset button for 5-10 seconds until the system indicates a reset, usually through a blinking light or audible signal. Release the button and turn the power back on. The system will now restart with factory settings. If issues persist, refer to the troubleshooting section or consult a professional. Regular resets can help maintain optimal performance and address software-related malfunctions.

Technical Specifications and Compatibility
The Aprilaire Model 700 offers advanced features, including a built-in humidistat and compatibility with various HVAC systems. It covers areas up to 4,200 square feet, ensuring efficient humidity control.
Technical Details of the Aprilaire Model 700
The Aprilaire Model 700 is a high-capacity humidifier designed for whole-house use, covering areas up to 4,200 square feet. It features a built-in humidistat for precise humidity control and is compatible with both heating and cooling systems. The unit operates with a water supply connection and includes a drain system for excess water disposal. It supports both manual and automatic control options, offering flexibility for different installation scenarios. The Model 700 is energy-efficient and designed to integrate seamlessly with existing HVAC systems. Its robust construction ensures long-term reliability, while its compact design allows for installation in various locations, including attics or basements. The system also includes an outdoor temperature sensor for optimal performance in varying climates. These technical specifications make the Aprilaire Model 700 a versatile and reliable choice for maintaining consistent indoor humidity levels.
Compatibility with Other HVAC Systems
The Aprilaire Model 700 is designed to seamlessly integrate with a wide range of HVAC systems, ensuring compatibility and optimal performance. It can be installed on either the supply or return ducts, making it adaptable to various system configurations. The humidifier is compatible with both heating and cooling systems, allowing it to maintain consistent humidity levels year-round. Its design supports integration with forced-air systems, providing whole-house humidity control. Additionally, the Model 700 works with both manual and automatic control options, offering flexibility for different installation needs. The unit’s compatibility with outdoor temperature sensors further enhances its ability to adapt to varying climates and HVAC setups. This versatility ensures that the Aprilaire Model 700 can be easily incorporated into most residential HVAC systems, providing reliable and efficient humidity management.

The Aprilaire Model 700 installation manual provides comprehensive guidance for a successful setup. Proper installation ensures efficient humidity control, enhancing indoor air quality and system performance for years to come.
Installing the Aprilaire Model 700 humidifier involves several critical steps to ensure proper functionality. First, mount the humidifier in a suitable location, ensuring level placement and secure fastening. Next, connect the water supply line and drainage system, making sure all connections are tight to prevent leaks. Install the outdoor temperature sensor to enable accurate humidity control based on external conditions. Wire the control system according to the provided diagrams, ensuring all electrical connections are safe and meet local codes. Finally, perform a thorough system check to verify proper operation, including testing the humidifier’s output and drainage. Always refer to the manual for specific instructions and safety precautions to guarantee a successful installation and optimal performance.
Ensuring Long-Term Efficiency and Performance
To maintain the Aprilaire Model 700’s efficiency, regular maintenance is essential. Clean the humidifier and water panel annually to prevent mineral buildup and bacterial growth. Check and replace the water pad as needed to ensure proper humidity output. Inspect the outdoor temperature sensor regularly to ensure accurate readings, which are crucial for optimal performance. Drain and clean the condensate pan and drain line to prevent blockages and mold growth. Additionally, ensure the humidifier is properly wired and connected to the HVAC system for seamless operation. Refer to the manual for specific maintenance schedules and recommendations. By following these steps, you can extend the lifespan of your Aprilaire Model 700 and ensure it continues to provide reliable humidity control for your home.
















































































