4
H120A,B BY-PASS DRUM HUMIDIFIER
69-1110—1
OPERATING YOUR HUMIDIFIER
Your HE120A Honeywell humidifier is controlled by the H908A
Convertible Humidity Control that is installed either on the
return air duct or on an interior wall in your living area. Choose
the humidity control setting using the combination relative
humidity/outdoor temperature setting scale on your humidity
control. Match the dial setting to the outdoor temperature for
optimizing the humidity level while reducing the moisture
condensation on your windows. The table below can also be
used to adjust the humidity control to the recommended
setting.
NOTE:
As the outside temperature drops, the recommended humidity control setting is
lowered to accommodate for the effects of dewpoint. These settings should reduce the
accumulation of moisture and ice on your windows and in other areas of your home.
Some indoor activities such as cooking,
showering and clothes drying can cause
excessive levels of humidity and start the
accumulation of moisture on your windows.
NOTE:
If this condition persists for more
than a few hours, set the humidity
control to the lowest setting to turn
off the humidifier. If the condition
does not improve, ventilate your
home to remove the moisture.
Your Honeywell
HE120B
Humidifier is
controlled by
the Honeywell
H1008 Auto-
matic Humidity
Control with
Hum
Software. The
automatic
humidity control
is mounted in
the return air duct where it can be exposed to
the air stream of the return air. The
Hum
Software inside your auto-
matic humidity control is designed to auto-
matically adjust the humidity level based on
indoor temperature and humidity, inferred or
measured outdoor temperature, and the
setting of the frost factor dial. The frost factor
allows for variations in furnace size, window
insulation and average daily climate tempera-
ture.
The Automatic Humidity Control with
Hum
Software requires an initial
adjustment period. Set the frost factor dial on
5 and use the following table to adjust the
frost factor—only one setting at a time—
increasing the dial setting if you feel you need
more humidity, or reducing the setting if you
see moisture on the inside of your windows.
For more precise humidity adjustment, set
the frost factor between dial settings. Allow
two days for the humidity level to subside
before making further adjustments. Once you
have tuned in the proper setting, you should
never have to adjust it again. Hum
Software takes over and makes any future
adjustments caused by varying outdoor
temperatures, thus reducing moisture build-
up on windows while maintaining the optimal
humidity level.
At Outside
Temperature
Recommended
Setting
At Outside
Temperature
Recommended
Setting
-20°F (-29°C)
15
+10°F (-12°C)
30
-10°F (-23°C)
20
+20°F (-7°C)
35
0°F (-18°C)
25
Above 20° (-7°C)
40
M12817
H1008A
M13155
H908A
