Manual Mode - Aprilaire 800 Owner's Manual

MANUAL MODE

FIGURE 3 – 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 recommended 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
+40°F
+30°F
+20°F
+10°F
–10°F
–20°F
0°F
Recommended RH
- 11 -
45%
40%
35%
30%
25%
20%
15%
90-1236B