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Turn the dial to the 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. - 5 To check the humidifier operation, set the humidistat above the click point, make sure that the water saddle valve is open and that there is electricity to the unit. Generally, 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 humidistat setting below the click point and the unit should automatically shut off. Now set the humidistat dial at the recommended inside relative humidity, depending on the outside temperature. Follow the suggested settings prior to a drop in the outside temperature. Additional Information Be sure to keep fireplace dampers closed when not in use. They provide an excellent escape route for heat, as well as humidity. Humidity is lost at an even faster rate than heat because water vapor tends to seek its own level and your humidifier would not be able to replace it even when running at full capacity. 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, again, 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. III. 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. Water used in homes contains varying amounts of minerals. The residue remaining as a result of hard water evaporation is primarily calcium and magnesium components and is usually quite hard, scaly, and dense. Residue from softened water tends to be soft and fluffy and has a greater volume than hard water scale. The service life of a Water Panel evaporator may be extended by using hard water, but in - 6 either case, the Water Panel evaporator is usually changed once a year. In the Models 448 and 445 Aprilaire Humidifiers, these solids will build up on the evaporator surface, in the reservoir and pump section. This is why proper maintenance is important and necessary. Service hot water, 140° maximum, is recommended with drain type units for increasing capacity and for heat pump applications. In the drain-equipped models, most of these solids are effectively controlled by flushing them down the drain. IV. ANNUAL MAINTENANCE For best performance, we recommend that you replace the water panel evaporator in your Aprilaire Humidifier annually. • Call the installer of your Aprilaire Humidifier. This information is often found on your equipment. • Call your heating and air conditioning dealer. • Use our “Dealer Locator” at: • Look in the Yellow Pages under Humidifying Apparatus or Heating & Air Conditioner Contractors. • If none of the above is successful and you still need information, please feel free to write us. V. ANNUAL SUMMER SHUTDOWN For Models 220, 224, 440, 445, 448, 550, 558, 560, and 568 close the bypass damper if provided. For the Models 445 and 448, empty the reservoir. AUTOMATIC HUMIDIFIER CONTROL: Humidifiers controlled by the Automatic Humidifier Control require no control adjustment. Shut off the water supply to the humidifier by closing the saddle valve. MANUAL HUMIDISTAT: Humidifiers controlled by a manual humidistat, simply turn the humidistat to the “Off” position. Shut of...

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