Installing An Aprilaire 700: Wiring Diagrams And Tips

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Aprilaire 700a / Furnace / AC Wiring HVAC DIY Chatroom Home

Installing an Aprilaire 700 whole-house humidifier can be an intimidating task for a first-time homeowner or DIYer. Wiring diagrams, instructions and tips can help you successfully complete the installation of your Aprilaire 700 humidifier.

Aprilaire 700 Wiring Diagrams

The Aprilaire 700 humidifier is a single-stage, bypass-style humidifier. It requires a power connection and a 24V AC transformer. The Aprilaire 700 also needs to be connected to a thermostat and to the HVAC system’s cold-air return duct. It should also be connected to a drain line. The wiring diagram for the Aprilaire 700 is included in the installation manual.

The wiring diagram provides a clear, easy-to-follow overview of all the components and connections needed to install the Aprilaire 700. The diagram includes detailed instructions for wiring the transformer, controlling the humidifier with a thermostat, and connecting the Aprilaire 700 to a drain line. The wiring diagram also includes a recommended location for the humidifier.

Tips for Installing an Aprilaire 700

When wiring the Aprilaire 700, it’s important to follow the instructions carefully and double check all the connections. Make sure the circuit breaker is off before you start and keep the transformer away from water. The transformer should be mounted on a wall or other solid surface.

When connecting the Aprilaire 700 to the cold-air return duct, make sure the unit is installed on the side of the duct facing away from the furnace or fan. This will ensure maximum performance. Make sure the unit is level so that the water flows evenly through the system. Finally, make sure the drain line is securely connected and there are no leaks.


Installing an Aprilaire 700 humidifier can be challenging, but with the help of a wiring diagram and a few tips, you can successfully complete the installation. Make sure to read the instructions carefully and double check all the connections for the best performance. Following the instructions and tips will help you get the most out of your Aprilaire 700 humidifier.