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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
Figure B – Manual Mode
When installed in the Manual Mode (see Figure B – internal
switch in “MAN” position and “M” in the display), it is important
to anticipate a drop in outdoor temperature and reduce the
setting accordingly to avoid excessive condensation. For
example, with an outdoor temperature of 20°F the correct setting
will be 35%. If the temperature is expected to fall to 0°F, then
merely reduce the setting to 25% several hours prior to the
temperature change.
90-1236B
MANUAL MODE (Automatic Mode – see page 4)AUTOMATIC MODE (Manual Mode – see page 5)