The Aprilaire 700M is a whole-home humidifier designed for forced-air systems, compatible with both supply plenums and cold air returns. It ensures efficient humidity control by using a fan to evaporate water into the airflow, providing optimal comfort. This guide offers step-by-step instructions for installation, including electrical connections, water supply setup, and control configuration, ensuring proper functionality and safety.
Overview of the Aprilaire 700M Humidifier
The Aprilaire 700M is a large fan-powered humidifier designed for whole-home use, compatible with forced-air systems. It efficiently adds moisture to dry air, improving indoor comfort. The unit is installed on either the supply plenum or cold air return, using a fan to draw air through a water-soaked evaporator pad. It requires a 120 VAC power source and works with both hot and cold water supplies, ensuring optimal performance in various home sizes.
Importance of Proper Installation
Proper installation of the Aprilaire 700M is critical for optimal performance, efficiency, and safety. Incorrect installation can lead to reduced humidification capacity, increased energy consumption, or even system damage. Adhering to the installation manual ensures correct electrical connections, water supply setup, and proper integration with HVAC systems. This also prevents safety hazards, such as electrical shock or water damage, and maintains warranty validity. Correct installation guarantees reliable operation and improved indoor air quality for years to come.
Contents of the Installation Manual
The Aprilaire 700M installation manual includes detailed instructions for installing, wiring, and configuring the humidifier. It covers compatibility with HVAC systems, electrical requirements, water supply options, and drainage setup. The manual also provides wiring diagrams, safety precautions, and troubleshooting tips. Additionally, it outlines the steps for setting up the digital humidifier control and offers guidance for optimal placement and maintenance to ensure efficient operation and long-term performance.
System Requirements and Compatibility
The Aprilaire 700M is compatible with forced-air HVAC systems, requiring a 120V power source. It works with both hot and cold water supplies and is suitable for installation on supply plenums or cold air returns, ensuring versatility for various home configurations.
Compatible HVAC Systems
The Aprilaire 700M is designed to integrate seamlessly with most forced-air HVAC systems, including gas, oil, and electric furnaces, as well as heat pumps. It operates effectively with standard ductwork configurations, making it a versatile solution for various heating systems. The humidifier is compatible with both single-stage and multi-stage furnaces, ensuring optimal performance across different HVAC setups. Proper installation ensures it works in harmony with the existing system for efficient humidity control.
Electrical Requirements
The Aprilaire 700M requires a 120 VAC power source, separate from the furnace motor circuit, to ensure reliable operation. A 10 VA transformer is necessary for the humidifier control, which must be connected to the HVAC system’s blower motor circuit. Proper wiring, as detailed in the manual, is essential to avoid electrical hazards. Always disconnect power before installation to prevent shocks or damage, ensuring a safe and functional setup.
Water Supply Options (Hot or Cold)
The Aprilaire 700M supports both hot and cold water supply connections, offering flexibility for different systems. Hot water (up to 140°F) is recommended for maximum evaporative capacity, especially in colder climates, as it enhances humidity output. Cold water is also an option but may reduce performance in extremely dry conditions. For heat pump systems, hot water is advised to compensate for lower air temperatures, ensuring efficient moisture distribution throughout your home.
Installation Options and Considerations
The Aprilaire 700M can be installed on either the supply plenum or cold air return, offering flexibility. Consider serviceability and space when choosing the location. Ensure proper orientation to cooling coils and avoid horizontal airflow ducts for optimal performance. Hot water is recommended for maximum efficiency, especially in heat pump systems, to enhance evaporation and humidity distribution.
Supply Plenum vs. Cold Air Return Installation
Installing the Aprilaire 700M on the supply plenum allows for efficient humidity distribution throughout the home via heated air. In contrast, the cold air return installation is ideal for systems with limited supply plenum space. Both options require proper alignment with cooling coils to prevent interference. Ensure the humidifier is level and securely fastened to maintain performance. Choose the location based on system configuration and service accessibility for optimal results.
Humidifier Placement and Serviceability
Proper placement of the Aprilaire 700M ensures optimal performance and easy maintenance. Install the humidifier near the furnace for efficient integration with the HVAC system. Ensure the unit is level to maintain even water distribution. Serviceability is key; position the humidifier in an accessible location with adequate clearance for routine maintenance and repairs. This setup ensures long-term reliability and simplifies future adjustments or replacements, making it a practical choice for whole-home humidity control.
Orientation and Cooling Coils Considerations
The Aprilaire 700M must be installed with the correct orientation relative to cooling coils to prevent interference. Avoid installing on ducts with horizontal airflow, as this reduces performance. Hot water supply is recommended for optimal evaporation, especially in heat pump systems where lower air temperatures occur. Ensure the humidifier is placed to avoid obstructing airflow or cooling coils, as this can impede system efficiency and humidity distribution.
Safety Instructions and Precautions
Disconnect electrical power before installation to avoid shock. Ensure proper grounding to prevent hazards. Follow drainage guidelines to prevent water damage and maintain safe operating conditions.
Electrical Safety Measures
Disconnect electrical power to the furnace before installation to prevent shock. Use a 120 VAC power source separate from the furnace motor circuit. Ensure the transformer meets the 10VA minimum requirement. Avoid wiring directly to the furnace’s internal circuitry. Ground the humidifier properly to prevent electrical hazards. Follow recommended wiring diagrams and instructions carefully to ensure safe operation. Always adhere to local electrical codes and regulations.
Drainage and Water Supply Safety
Ensure the drain line is properly sloped to prevent water stagnation and potential leaks. Use cold or hot water (up to 140°F) for optimal performance. Secure all water supply connections to avoid leaks. Regularly inspect the drain line for blockages or damage. Maintain proper water pressure to prevent overflow. Avoid contamination by ensuring the water supply is clean and filtered. Follow all safety guidelines to prevent water damage or mold growth.
Grounding and Hazard Prevention
Ensure the humidifier is properly grounded to prevent electrical shock. Use a grounding wire compatible with your system. Install the unit on a level surface to avoid tipping. Keep flammable materials away from the humidifier. Regularly inspect electrical connections for damage or wear. Follow all local electrical codes and safety standards. Proper grounding prevents hazards and ensures safe operation of the Aprilaire 700M humidifier.
Electrical Connections and Wiring
Connect the Aprilaire 700M to a dedicated 120V circuit. Use the recommended wiring diagrams for proper connections. Ensure all wires are securely fastened and meet local codes. Always use correct connectors to prevent electrical hazards and ensure safe, efficient operation of the humidifier.
Recommended Wiring Diagrams
Refer to the wiring diagrams provided in Step 6 of the installation manual or the Humidifier Control Safety and Installation Instructions. Use the recommended diagrams (e.g., 90-922 and 90-921) for proper connections. Ensure the humidifier is connected to a dedicated 120V power source, separate from the furnace motor circuit, to avoid electrical interference and ensure safe operation. Always follow local electrical codes and consult a professional if unsure.
Power Source Requirements
The Aprilaire 700M requires a dedicated 120V AC power source, separate from the furnace motor circuit, to ensure reliable operation. A 10VA transformer is needed for the humidifier control. Always use a grounded circuit and follow local electrical codes. Do not share the power source with other devices to prevent interference. Ensure the power supply is disconnected during installation to avoid electrical hazards. Consult a licensed electrician if unsure.
Wiring Instructions for Model 700M
Refer to the recommended wiring diagrams in Step 6 or the humidifier control manual. Connect the 120V AC power source to the terminals, using a 10VA transformer for the control. Wire the humidifier control’s R and C terminals to the HVAC system’s 24V AC terminals. Ensure all connections are secure and use 18-20 AWG wires. Follow the sequence: power source, control, and humidifier. Disconnect power before starting and adhere to local electrical codes for safety.
Water Supply and Drain Setup
Connect the water supply line to a nearby water source, using a saddle valve for hot or cold water. Install a drain line with a P-trap to ensure proper drainage and prevent backflow. Regular maintenance, including cleaning the drain line, is essential for optimal performance and to avoid blockages.
Connecting the Water Supply Line
To connect the water supply line, locate a nearby water source and install a saddle valve. Attach the supply line to the valve and route it to the humidifier. Use 1/4″ tubing, ensuring a tight connection to the humidifier’s inlet. For optimal performance, hot water (up to 140°F) is recommended. Secure the tubing with clips to prevent movement and leaks; Always follow local plumbing codes and test connections before operation.
Drain Line Installation and Maintenance
Install a drain line using 1/2″ PVC or PEX tubing, directing condensate to a floor drain or condensate pump. Ensure the line slopes 1/4″ per foot for proper flow. Avoid kinks or sharp bends to prevent blockages. Regularly inspect the drain line for mineral buildup or debris. Clean annually to maintain efficiency and prevent water damage. Always follow local plumbing codes and ensure the drain line is securely connected to the humidifier’s drain outlet.
Hot Water vs. Cold Water Supply
Hot water is recommended for the Aprilaire 700M, as it provides maximum evaporative capacity, especially in colder climates. Hot water (up to 140°F) enhances moisture absorption, improving efficiency. Cold water is an alternative but may reduce performance. Ensure the water supply line is properly connected, and for hot water, maintain insulation to prevent heat loss. Always follow the installation manual for specific temperature and supply line recommendations to optimize humidifier operation and longevity.
Humidifier Control and Operation
The Aprilaire 700M features an Automatic Digital Humidifier Control, offering manual or automatic operation. It ensures optimal humidity levels by adjusting to home conditions, providing efficient comfort year-round.
Installing the Digital Humidifier Control
The Aprilaire 700M Digital Humidifier Control is installed in the cold air return duct. Mount the control securely, ensuring accessibility for adjustments. Connect the outdoor temperature sensor for automatic mode operation. Follow the wiring diagram provided in the manual, ensuring all connections are secure and meet safety standards. After installation, set the initial dial to 5 for normal operation. This ensures precise humidity management and system efficiency.
Setting the Initial Dial Setting
Set the dial to position 5 for the initial setup, ensuring balanced humidity levels. This default setting is ideal for most homes. Adjustments can be made based on humidity readings or comfort levels. Proper initialization ensures efficient operation and prevents over-humidification. Refer to the control’s menu for fine-tuning options, ensuring optimal performance throughout the heating season.
Automatic vs. Manual Mode Operation
The Aprilaire 700M offers two operation modes: Automatic and Manual. In Automatic mode, the system adjusts humidity levels based on outdoor temperatures, optimizing comfort and efficiency. Manual mode allows for direct control of humidity settings, ideal for specific preferences. For initial setup, set the dial to position 5 and adjust as needed. Automatic mode is recommended for most users, while Manual mode provides flexibility for customized control.