III.OPERATING INSTRUCTIONS- 110, 112, 220, 224, 350, 360, 440, 560, 760
Your new Aprilaire Humidifier is controlled by a manual humidistat installed either in the living area or in the cold air return. It is important to anticipate a drop in temperature and reduce the setting accordingly to avoid excessive condensation. For example. with an outside 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 (see table 3).
The humidistat is a precision instrument that can be used to determine the RH accurately in your home during the winter. Turn the dial to a lower setting, then reverse the dial direction slowly until a “click” is heard. At this point, read the RH on the dial. This will be very close to the actual RH in your home.
IV. ADDITIONAL INFORMATION- ALL MODELS
To check the humidifier operation, set the Humidifier Control above the click point, make sure that the water saddle valve is open and that there is electricity to the unit. With all models except the 350 and 360 Aprilaire Humidifiers, the furnace blower motor must be operating for the Aprilaire Humidifier to function. After the humidifier has operated for several minutes and water is entering the unit and coming out at the drain, reduce the setting below the click point and the unit should automatically shut off.
Be sure to keep fireplace dampers closed when not in use. They provide an excellent escape route for heat, as well as humidity.
On occasion, indoor moisture producing activities such as clothes drying, cooking, showers, etc., may raise the relative humidity level higher than it should be, even though the Aprilaire Humidifier is not operating. Telltale indications are condensation or frost on cold surfaces such as windows, doors, walls, etc. If such condensation persists for several hours, your home should be ventilated to dissipate the potential damaging excess moisture levels.
V. EFFECT OF WATER CHARACTERISTICS
Your humidifier will operate effectively using either hot, cold, hard or mechanically softened water. Whether to use available tap water, even though it may be quite hard, or chemically softened water, is a common concern to homeowners when installing a humidifier.
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