Honeywell HE420A Owner's Manual - Page 3

HE420A STEAM POWER HUMIDIFIER OPERATING YOUR HUMIDIFIER The HE420A Honeywell Humidifier is controlled by an Automatic Humidity Control. The Automatic Humidity Control is mounted in the return air duct where it can be exposed to the air stream of the return air and is designed to automatically adjust the humidity level based on indoor temperature and humidity, inferred or measured outdoor temperature, and the dial setting. The control allows for variations in furnace size, window insulation and average daily climate temperature. The Automatic Humidity Control requires an initial adjustment period. Set the frost factor dial on 5 and use the following table to adjust the frost factor-only one setting at a time-increasing the dial setting if you feel you need more humidity, or reducing the setting if you see moisture on the inside of your windows. For more precise humidity adjustment, set the frost factor between dial settings. Allow two days for the humidity level to subside before making further adjustments. Once you have tuned in the proper setting, you should never have to adjust it again. The control takes over and makes any future adjustments caused by varying outdoor temperatures, thus reducing moisture buildup on windows while maintaining the optimal humidity level. Humidity Level Insufficient humidity Condensation on windows Recommended Adjustment Increase the frost factor dial by one setting. Decrease the frost factor dial by one setting. The Automatic Humidity Control can also be set for manual operation. Once the control is installed in the cold air return and internally set to MANUAL, turn the dial to the expected outdoor temperature. The corresponding optimal humidity level has been calibrated for you. For example, by setting the dial to an anticipated 20°F, the control automatically maintains the indoor relative humidity in the safe, comfortable 35% range (see table below). Outside Temperature +40°F +30°F +20°F +10°F 0°F -10°F -20°F Recommended RH 45% 40% 35% 30% 25% 20% 15% 3 69-1112-2