How do I operate the humidifier?
Once the humidifier is installed and running, operation is automatic. Use the humidity control provided to
make any changes to the setpoint.
If you have questions about how to operate the humidifier, ask your installer.
• How do I use the humidity control? When humidity
in the home is lower than the humidity control's
setpoint, the control will call for humidity. Some
controls will also monitor outdoor conditions to
ensure indoor humidity does not condense on
windows and walls.
• What should my humidity setpoint be? The outdoor
air temperature affects how much humidity can be
retained by the air in your home. Use this table as a
starting point. Then adjust the humidity control to
your own comfort or until condensation appears on
the windows, at which point you should lower the
setpoint.
• What is a frost setting? Some humidity controls (such as Prestige, VisionPRO IAQ, and TrueIAQ) contain
a Window Frost Protection feature that limits humidity output based on outdoor conditions. For example,
on colder days, the air in your home can hold less humidity. The humidity control automatically lowers the
humidity setpoint accordingly, to prevent frost from appearing on the inside of your windows.
Lower the frost setting by one value each morning that you see frost or condensation on windows. Allow
24 hours for the new setting to take effect before re-adjusting. Once you have this set to a comfortable
level without condensation, you will not need to adjust further. You can adjust your humidity setpoint
without worrying about condensation.
Manual humidity controls (such as the H8908) do not have built-in frost settings. They require you to adjust
the humidity setpoint when the outdoor temperature changes. Use higher humidity setpoints when the
temperature is warmer, and lower setpoints when the temperature is cooler.
Humidifier 69-2414EFS—01
Outdoor
Temperature
-20
F (-29
C)
°
°
-10
F (-2-3
C)
°
°
0
F (-18
C)
°
°
10
F (-12
C)
°
°
20
F (-7
C)
°
°
>20
F (-1
C)
°
°
Recommended Relative
Humidity Setting
15%
20%
25%
30%
35%
35%
M27982
9