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Automatic Digital Humidifier Control
Your Automatic Digital Humidifier Control works in conjunction
with your heating, ventilating, air conditioning equipment (HVAC)
to control the operation of the humidifier. The control senses
indoor humidity and outdoor temperature and automatically
adjusts the operation of the humidifier to provide the optimum
humidity level in the home.
The digital readout on the automatic control displays the humidity
level inside the cold air return duct. This reading will accurately
indicate the humidity in the living space when the HVAC blower is
operating.
Your Aprilaire Humidifier Control is installed in the cold air return
duct. During the first heating season, your Humidifier Control
needs to be set initially to match your home’s condition. Please
follow these steps when adjusting your control (refer to Figure A).
1. Turn the dial setting knob to “5”, which is within the normal
range. During the next 24-48 hours it may be necessary to
adjust the dial for more or less humidity, depending on your
personal comfort and home’s requirements. Refer to TABLE 3 –
Operation Guide.
2. During the coldest portion of the first heating season, minor
adjustments may be necessary. This is dependent upon your
home’s construction. Refer to TABLE 3 – Operation Guide.
The 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 to “OFF” when performing annual
maintenance of your Aprilaire humidifier.
90-1235B
Figure A – Automatic Mode
AUTOMATIC MODE (Manual Mode – see page 6)
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