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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 2).
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 4 – 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 4 – 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.
AUTOMATIC MODE
FIGURE 2 – Automatic Mode
90-1235B
MANUAL MODE
When installed in the Manual Mode (see Figure 3 – 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 that evening, then merely
reduce the setting to 25% several hours prior to the temperature change.
See Table 2 for the recommended settings. These settings, which are based
on years of research, represent a compromise between humidity levels that
would be most desirable for comfort and humidity levels that are suitable
for protection of your home and to avoid condensation on your windows. For
example, a wintertime indoor humidity of 50% may be considered ideal for
comfort, but unfortunately, it probably would result in condensation, which can
cause damage to your home. Observing the recommended humidity levels on
your Humidifier Control is an important safeguard. Condensation of water on the
inside surface of windows in the form of fogging or frost is usually an indication
of too much humidity. This same condensation can occur in other areas in your
home, possibly resulting in damage.
TABLE 2 – Outdoor Temperature/Indoor Relative Humidity
Outside Temperature Recommended RH
+40°F 45%
+30°F 40%
+20°F 35%
+10°F 30%
0°F 25%
–10°F 20%
–20°F 15%
FIGURE 3 – Manual Mode
90-1236B