How to Install a Whole House Humidifier to an Outdoor Sensor

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What You'll Need
Whole house humidifier
Outdoor sensor
Wire stripper
Wire cutter
Tape measure

A whole house humidifier can be connected to an outdoor sensor in order to gain input for condensation control. The sensor is installed outside of the home and is used to measure the outdoor temperature.

Step 1 - Plan the Installation

Choose a humidifier best suited for your home. Read the instructions carefully on the manual before starting the installation process. Choose where to install the device. In many cases, it has to be attached to the plenum or the air recirculation duct. Check the recommendations in the manual to determine how best to install the device to the plenum.

Step 2 - Mount the Humidifier

Use the template provided in the package to determine where to drill holes in the air duct. Use tin snips to cut the opening where the device would be installed. Mount the device to the duct using the mounting hardware included in the installation kit.

Step 3 - Connect the Water Supply

Connect the plastic tubing provided in the kit to the water supply valve found in the humidifier. Run the plastic tubing to the nearest cold water supply. Before making the connection, shut down the water supply. Cut any extra tubing using a utility knife and secure the connection. If the cold water supply is made of copper, simply slip the plastic tubing over it. Crimp the connection to ensure a tight seal.

Step 4 - Mount the Humidifier Control

The humidifier control should be mounted properly to the return duct. It should also be at least six inches upstream from the humidifier. Using the template provided in the kit, mark the opening on the duct and cut it with tin snips. Secure it with sheet metal screws and seal all mounting holes tightly.

Step 5 - Install the Outdoor Sensor

The outdoor sensor should be mounted on the east, west, or north side of the house away from direct sunlight. It should also be at least 3 feet from every exhaust vent and above the expected snow line. Mount the device to the chosen location following the instructions on the manual.

The sensor should be wired to the humidifier control. Locate existing holes that can be used to run the wires from the sensor to the control. Keep the wires from contact with hot wires carrying 120V of electricity.

Step 6 - Connect the Wires to the Humidifier Control

Locate the R and C terminals on the humidifier control. Strip 1/4 inch of wire insulation from the sensor wires and directly connect them to the R and C terminals. The sensor will get power from the device when it is turned on. After the sensor and control have been connected to each other properly, wire the humidifier to the power supply following the wiring diagram provided in the owner’s installation manual. Read the instructional manual carefully to determine how to operate the device. Turn on the power and water supply and test the installation.