(Table 2) % Relative Humidity Guide
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| Outdoor Temperature (ºF) |
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| 0 | 10 | 20 | 30 | 40 | |
| 1 | 10 | 10 | 10 | 15 | 20 | 25 |
| 2 | 10 | 10 | 15 | 20 | 25 | 30 |
Setting | 3 | 10 | 15 | 20 | 25 | 30 | 35 |
4 | 15 | 20 | 25 | 30 | 35 | 40 | |
Dial | 5 | 20 | 25 | 30 | 35 | 40 | 45 |
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| 6 | 25 | 30 | 35 | 40 | 45 | 45 |
| 7 | 30 | 35 | 40 | 45 | 45 | 45 |
As an example, if the outdoor temperature is 20º F, and, following step 3, the humidifier turns off at “5” on the dial range, then the RH in your home is 35%.
Manual Mode:
(Automatic Mode – see pg 3)
Your Aprilaire Humidifier Control is installed in the cold air return. It is important to anticipate a drop in outdoor temperature and reduce the setting accordingly to avoid excessive condensation. For exam- ple, with an outdoor temperature of 20° the correct setting will be 35% relative humidity. If the temperature is expected to fall to 0° that evening, then merely reduce the setting to 25% several hours prior to the temperature change.
The recommended settings on the humidistat are based on years of research (see table 3) and experience as to what is best for the average home. These settings represent a compromise between RH levels that would be most desirable for comfort reasons and humidity levels that are suitable for protection of your home and to avoid condensation on your windows. For example, a wintertime indoor RH of 50% may be considered ideal, but unfortu- nately, it probably would result in damage to your home. Observance of the recommended RH levels on your humidistat, therefore, is an important safeguard. Condensation of water on inside windows in the form of fogging or frost is usually an indica- tion of too high relative humidities. This same condensation can take place in other areas in your home with the possibility of dam- age resulting.
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