This is an instruction manual that introduces the features and usage of Aprilaire ® humidifiers.
The document serves as an owner's manual for Aprilaire Models 400, 500, 600, and 700. It explains the evaporative principle of operation where water flows over a Water Panel evaporator to add moisture to air circulated by a furnace blower.
| Relative Humidity Range | 10% to 45% |
|---|---|
| Water Panel Replacement Frequency | Annually (Model 400: Twice per season) |
Set the thermostat to activate the blower, turn the humidifier dial off and on slowly until you hear clicks, then note the setting against Table 2.
Reduce the setting on the control dial by one increment.