TrueEASE Owner's Manual
EVERYDAY
OPERATION
Once the humidier 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 humidier, ask your installer.
How do I operate the humidier?
• 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.
M27982
• 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.
Outdoor Recommended Relative
Temperature Humidity Setting
-20°F (-29°C) 15%
-10°F (-2-3°C) 20%
0°F (-18°C) 25%
10°F (-12°C) 30%
20°F (-7°C) 35%
>20°F (-1°C) 35%
Humidier 69-2414EF—09
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