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Your Aprilaire Automatic Humidifier, is a high precision system that will
accurately maintain the relative humidity in your home to a maximum of
45% RH and a minimum of 10% RH. For every 1° change in outdoor
temperature, the control will automatically adjust the indoor relative
humidity (RH) by
1
/2%. If you would like to determine the RH in your
home, follow these steps:
1. Determine the outdoor temperature.
2. Activate the furnace blower by setting your thermostat to a higher
temperature.
3. Turn the humidifier control dial setting to the “Off” position. Then, slowly
turn the dial clockwise until you hear the solenoid valve on the humidifier
“click on.” Next, slowly turn the dial counter clockwise until you hear the
solenoid valve “click off”. At this point, make note of the dial setting.
4. Locate your dial setting on Table 2. Follow the dial setting to the right
until it intersects with the current outdoor temperature. This is the
relative humidity in your home under existing conditions.
5. Return the thermostat and the Humidifier Control to their original
settings.
The values of outdoor temperature and dial settings may fall in between
or outside of the listed values in Table 2. In these cases, you can only
approximate your home’s actual indoor RH.
The relative humidity in your home
will now be accurately controlled to
meet your needs and should not
need further adjustment during
future heating seasons. Make note
of the dial setting in the event you
temporarily move the knob when
performing annual maintenance of
your Aprilaire Humidifier.
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AUTOMATIC MODE
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FIGURE A