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Aprilaire Humidistat Wiring Diagrams

The following illustration describes six possible ways to wire your Aprilaire humidifier to your furnace or air handler. The wiring diagrams necessary for your installation will vary depending on the equipment that you are installing your Aprilaire humidifier with. Please take note of the difference between the high and low voltage lines. You DO NOT want to connect high voltage lines directly to a low voltage unit such as the humidistat controller. This will damage your unit and void the warranty. It is recommended to test all installation wires with a voltmeter to determine each wire's voltage.




Aprilaire 4655
Manual Humidistat
Aprilaire 56
"Auto Trac" Humidistat
Aprilaire 58
Digital Electronic Auto Humidistat


How To Wire Your Aprilaire Humidistat


 Aprilaire Humidistat Diagrams