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The Automatic Humidifier will accurately control the humidity in your home to a maximum of 45% RH and a minimum of 10% RH. The values of outdoor temperature and dial settings may fall in between or outside of the listed values in Table 2. In these cases, you can only approximate your home’s actual indoor RH. - 4 To check the humidifier’s operation, note the current setting and set the Automatic Humidifier Control to the test mode when the furnace blower motor is operating. Water will flow into the humidifier for 1 minute and then it will turn off. This insures the unit is operating properly. Do not leave the control in the test mode as it will not operate. Reset the control to it’s original setting. Model HUMD200A with Manual Mode: (Automatic Humidifier Control – see pg 3) Your new Humidifier is controlled by a humidifier control installed either in the living area (typically near the thermostat) or 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°F the correct setting will be 35% relative humidity. If the temperature is expected to fall to 0°F 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 (see Table 3) and experience as to what is best for the average home. 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. For example, a wintertime indoor RH of 50% may be considered ideal by some, but unfortunately, it probably would result in damage to your home. Observance of the recommended RH levels on your humidistat, therefore, is an important safeguard. Condensation of water on inside windows in the form of fogging or frost is usually an indication of too high relative humidities. This same condensation can take place in other areas in your home with the possibility of damage resulting. TABLE 3 – Outdoor-Indoor Relative Humidity +40°F 45% +30°F 40% +20°F 35% +10°F 30% 0°F 25% – 10°F 20% – 20°F 15% 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 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. Outside Temperature Recommended RH - 5 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. Generally, the furnace and blower motor must be operating for the humidifier control to function. After the humidifier has operated for several minutes and water is entering the unit and coming out at the drain, reduce the humidifier control 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 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 potentially damaging excess moisture. 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. Because of the humidifier’s design, most of these solids are effectively controlled by flushing them down the drain. 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 Humidifier Pad may be extended by using hard water, but in either case, the Humidifier Pad should be changed once a year. This is why proper maintenance is important and necessary. Service hot water ...

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