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Refer to TABLE 3 – Operation Guide. 2. During the coldest portion of the first heating season, minor adjustments may be necessary. This is dependent upon your home’s construction. Refer to TABLE 3 – Operation Guide. The RH 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 to “OFF” when performing annual maintenance of your Aprilaire humidifier. - 4-- 5 MANUAL MODE WATER PANEL CHANGE INDICATOR FIGURE B – Manual Mode 90-1236 Manual Mode Label and Resistor When installed in the Manual Mode (see Figure B), 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% RH. 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. See Table 1 for the recommended settings. These settings, which are based on years of research, represent a compromise between RH levels that would be most desirable for comfort and humidity levels that are suitable for protection of your home and to avoid condensation on your windows. For example, a wintertime indoor RH of 50% may be considered ideal for comfort, but unfortunately, it probably would result in condensation, which can cause damage to your home. Observing the recommended RH levels on your Humidifier Control is an important safeguard. Condensation of water on the inside surface of windows in the form of fogging or frost is usually an indication of too much RH. This same condensation can occur in other areas in your home, possibly resulting in damage. The control keeps track of humidifier operation time. The yellow “Change Water Panel” light flashes after a preset amount of running time has elapsed. This running time is preset by the installer based on the humidifier model and water characteristics. Refer to the Annual Maintenance section for instructions on changing the Water Panel or call your heating and air conditioning dealer for service. After the Water Panel is replaced, turn the Control knob to the “Test/Reset” position until the green “Humidifier ON” light flashes, to reset the Water Panel change timer. TEST/RESET The Test/Reset feature allows the humidifier operation to be checked even if there is no call for humidity. See “Check the Humidifier Operation” on page 9. ADDITIONAL INFORMATION Your humidifier is a precision system that will accurately maintain the RH in your home. For every 2°F change in outdoor temperature, the Automatic Digital Humidifier Control will automatically adjust the indoor RH by 1%. The Automatic Digital Humidifier Control will accurately control the humidity in your home to a maximum of 45% RH and a minimum of 10% RH. The RH Values in Table 2 are targets based on outdoor temperature and the ADHC control setting. The actual RH may vary due to conditions in the home (cooking, showering, etc.). TABLE 1 – Outdoor Temperature/ Indoor Relative Humidity Outside Temperature Recommended RH +40°F 45% +30°F 40% +20°F 35% +10°F 30% 0°F 25% –10°F 20% –20°F 15% TABLE 2 % Relative Humidity Guide Outdoor Temperature (°F) -10°F 0°F 10°F 20°F 30°F 40°F Dial Setting1 10% 10% 10% 15% 20% 25% Relative Humidity 2 10% 10% 15% 20% 25% 30% 3 10% 15% 20% 25% 30% 35% 4 15% 20% 25% 30% 35% 40% 5 20% 25% 30% 35% 40% 45% 6 25% 30% 35% 40% 45% 45% 7 30% 35% 40% 45% 45% 45% - 6-- 7 TABLE 3 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. (Solenoid does not “click” when control is moved to “Test/Reset” position.) Turn dial to “Test/Reset”. Make certain HVAC blower is operating and HVAC is calling for heat. If unit still does not operate, consult a heating contractor. Humidifier won’t shut off. Turn dial to “Off”. If unit continues to operate, consult a heating contractor. Test mode. System operation is checked by setting the knob to “Test/Reset”. Make certain HVAC blower is operating and HVAC is calling for heat. Humidifier will operate for one minute. NOTE: Placing the knob in “Test/Reset” resets the Water Panel change timer. Red “Call Dealer for Service” light flashes (Figure A). Note the error code on the display (E1, E2, E3 or E4) and call your heating and air conditioning dealer. Yellow “Change Water Panel” light flashes (Figure A). Refer to the Annual Maintenance section (page 11) for instructions on changing the Water Panel or call your heating and air conditioning dealer for service. After the Water Panel is replaced, turn the Control knob to the “Test/Reset” position until the green “Humidifier On” light flashes, to reset the Water Panel change timer. OPERATING INSTRUCTIONS – MODELS 350, 360, 500M, 600M & 700M F...

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