Filter
Top Products
Operating Manual
69-2035EFS—05 4
With automatic controls like TrueIAQ and VisionPRO
IAQ, you need only calibrate this setting once. The
automatic feature will adjust by itself as outdoor condi-
tions change, based on your initial settings. After set-
ting your auto control to the desired RH% level, check
for condensation or frost forming on windows on the
first cold day. If present, adjust your frost settings on
the control (see control owner’s manual if needed).
The Window Frost Protection feature protects your
home by limiting humidity output based on outdoor
conditions (for example, on colder days, your home can hold less humidity).
Frost Settings should be lowered by one value each morning that you see frost or condensa-
tion on windows. Allow 24 hours for the adjustment to take affect. Once you have this set to a
comfortable level without condensation forming, you will not need to adjust this again. You can
adjust your humidity settings without worrying about condensation.
With Manual Humidity Controls—such as the H8908—you
will need to adjust your RH% settings each time the outdoor
conditions change (more humidity with warmer outdoor con-
ditions, lower humidity with colder conditions). These con-
trols provide accurate operation, but require more hands on
adjustment. These controls are a good choice for homeown-
ers who desire continuous interaction with humidity settings.
Setting the controls
The colder it is outside, the less humidity can be retained by the air. Initially setting your humidi-
stat to ideal comfort levels will help your TrueSTEAM deliver optimal humidification. The table
below provides suggested control settings based on outdoor conditions.
M24830
1 2 3 4 5 6 7 8 9
LESS HUMIDITY
LOOSE HOME/SINGLE-PANE WINDOWS
MORE HUMIDIT
Y
TIGHT HOME/TRIPLE-PANE WINDOWS
You may experience that your home needs
humidity levels to be slightly higher or lower
than the suggested levels given in the table, in
order to prevent window condensation or dry-
ness. This is because your home is unique in
size, shape, building tightness, and age. These
variables play an active role in how your indoor
humidity fluctuates. Use the table as a start-
ing point, but adjust according to your comfort
and observations of condensation.
Outdoor
Temperature
Recommended RH %
Setting
-20°F (-29°C) 15%
-10°F (-23°C) 20%
0°F (-18°C) 25%
10°F (-12°C) 30%
20°F (-7°C) 35%
>20°F (-1°C) 40%