Aprilaire 800 Steam Humidifier Digital Control
What is the difference between MANUAL mode and AUTO mode ?
Operating in MANUAL mode, your humidistat is configured to measure your indoor return air RH (relative humidity) level within your furnace return plenum.
Operating in AUTO mode, your humidistat is configured to measure your outdoor air temperature by utilizing an outdoor sensor.
What is the difference between MECHANICAL and DIGITAL humidistats ?
A DIGITAL humidistat includes an outdoor sensor, and is capable of operating in both MANUAL or AUTO modes. The outdoor sensor installation is optional. Additional costs are usually incurred in order to run the sensor to the outside of your home.
A MECHANICAL humidistat is only capable of operating in MANUAL mode.
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