How to Adjust the Solenoid on an Aprilaire Humidifier

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The Aprilaire humidifier disperses moisture from the appliance to your home's heating ducts with automatic or manual configuration, and includes a solenoid valve to regulate water flow through the appliance. Adjusting the solenoid valve requires manually configuring the humidifier's settings, which results in higher or lower water flow through the appliance. Increased water flow raises humidity levels throughout your home, and requires careful configuration to prevent excessive indoor moisture that promotes mildew growth.

Things You'll Need

  • Nail
  • In-line strainer
  • Shut off your home's water supply and unplug the HVAC's power cord to disable power.

  • Unscrew the compression nut on the water line connected to the humidifier with your fingers by turning it to the left.

  • Insert the nail into the inlet end of the water line, which has an arrow pointing upward near the connection, to pull out the in-line strainer. Insert a new strainer in the inlet end.

  • Connect the in-line strainer back into the inlet end of the water line and tighten the compression nut by turning it to the right to secure it.

  • Turn on the water supply and plug the HVAC system into the nearby electrical outlet.

  • Push the switch below "Blower Activation" to the right to power on the HVAC system.

  • Grab the knob on the front of the humidifier control and turn it clockwise until the arrow points to "Test/Reset."

  • Leave the arrow pointed at the reset option for one minute while the humidifier operates while the heating system's fan runs.

  • Turn the knob counterclockwise to set it back to option 3, 4 or 5 to return the humidifier to normal operation mode. The solenoid makes a clicking noise when the humidifier is active and begins distributing moisture through the water feed tube.

Tips & Warnings

  • The in-line strainer is available at the Aprilaire eStore online.

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