TABLE 2 – % Relative Humidity Guide
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| Outdoor Temperature (°F) |
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| 0 | 10 | 20 | 30 | 40 | |
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| 1 | 10 | 10 | 10 |
| 20 | 25 |
| 15 | ||||||
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| 2 | 10 | 10 | 15 |
| 25 | 30 |
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| 20 | ||||||
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| 3 | 10 | 15 | 20 |
| 30 | 35 |
Setting | 25 | ||||||
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4 | 15 | 20 | 25 |
| 35 | 40 | |
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30 | |||||||
Dial |
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5 | 20 | 25 | 30 | 35 | 40 | 45 | |
| 6 | 25 | 30 | 35 | 40 | 45 | 45 |
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| 7 | 30 | 35 | 40 | 45 | 45 | 45 |
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As an example, if the outdoor temperature is 20°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 4)
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 example, 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 Humidifier Control are based on years of research and experience (see Table 3). 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 unfortunately, it probably would result in damage to your home. Observance of the recommended RH levels on your Humidifier Control, therefore, is an important safeguard. Condensation of water on inside windows in the form of fogging or frost is usually an indication of too much relative humidity. This same condensation can take place in other areas in your home with the possibility of damage resulting.
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