II. OPERATING INSTRUCTIONS- 448, 558, 568, 768
There are two possible modes of operation of your Aprilaire Humidifier Control - Automatic and Manual. An explanation of both follows:
Automatic Mode: (Manual Mode-see pg 6)
Your Humidifier Control is installed in the cold air return. During the first heating season, your Humidifier Control needs to be set initially to match your home’s condition. Please follow these steps when adjusting your control (refer to Figure A).
1.Turn the dial setting knob to “5,” which is within the normal range. During the next
2.During the coldest portion of the first heating season, minor adjustments may be necessary. This is dependent upon your individual home construction, refer to the “Operation Guide” (Table 1).
TABLE 1 – Operation Guide
Condition | Solution |
Condensation on windows | Reduce the setting on the control dial |
| by 1 increment. |
Lack of humidity | Increase the setting on the control dial |
| by 1 increment. |
Humidifier does not operate | Turn dial to “Test.” Make certain furnace |
| blower is operating and furnace is calling |
| for heat. If unit still doesn’t operate, |
| consult a heating contractor. |
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|
Humidifier won’t shut off | Turn dial to “Off.” If unit continues to |
| operate, consult a heating contractor. |
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|
Test mode | System operation is checked by setting the |
| knob to “Test.” Make certain furnace blower |
| is operating and furnace is calling for heat. |
| Humidifier will operate for one minute. |
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The relative humidity in your home will now be accurately controlled to meet your needs and should not need further adjustment during future heating seasons. Make note of the dial setting in the event you temporarily move the knob when performing annual maintenance of the Aprilaire Humidifier.
FIGURE A
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| 7 |
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| A | L | 6 |
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| M |
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O | R | 5 |
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N |
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| 4 |
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3 |
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2 | 1 |
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T e
s t
Off
AUTOMATIC MODE
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