5. Remove the black distribution tray (4) from the evaporative assembly (3) by unsnapping the white plastic holding strips from the tabs at the end of the tray. Lightly scrape out any calcium deposits and clean the “V” notches (5) but do not scrape off the granular coating from the bottom. This textured surface helps ensure even water flow for maximum performance. 6. Slide the Water Panel evaporator (6) out from the white plastic scale control insert (7). Clean the insert frame by twisting and flexing it to loosen the calcium deposits or use a putty knife. Replace Water Panel evaporator annually with a new Water Panel evaporator (Stock No. 35). Slide the Water Panel evaporator back into the scale control insert with the red colored spot up and snap the black distribution tray (4) back into place. 7. Re-install the evaporative assembly (3) into the base assembly (2). Push the evaporative assembly (3) in at the top between the retaining ribs that hold the assembly in place in a vertical position. 8. Remove the drain hose (8) from the bottom of the unit. Bend and flex it to loosen the internal calcium deposits. Then flush it with water under pressure and slip it back onto the drain fitting. 9. Reinstall cover assembly (1) by hooking at the top of the base assembly (2) and latching at the bottom. 10. Reconnect electrical power (9) and turn on the water supply. 11. Check system operation: Manual Humidistat: Turn up humidistat to highest setting and make sure the furnace blower is operating. Humidifier will operate if RH is less than 50%. Automatic Humidifier Control: Check system operation by setting the knob to “Test.” With furnace blower operating and furnace calling for heat, humidifier will operate for one minute. 12. Set humidistat or control to its original position. - 10 MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 440 CAUTION! Sudden operation may cause personal injury or property damage. Turn humidistat to “off” or lowest setting before servicing. 1. Note humidistat setting and turn dial to the “Off” position. 2. Remove two aluminum knobs (1), swing up and remove top cover (2) from humidifier. 3. Place finger under white plastic water outlet (3) at top of black water distribution pan (4). Lift up to pop outlet loose from hole and notch in black distribution pan. 4. Tip forward and lift the complete plastic framed evaporative assembly out of the humidifier. 5. To remove black plastic water distribution pan from evaporative assembly, push down on pan and out on white plastic frame (Scale Control Insert). Clean “V” openings in water distribution section of upper housing but do not scrape off granular coating from bottom. This helps to ensure proper even water flow for maximum performance. 6. Remove Water Panel evaporator from Scale Control Insert and clean Insert by flexing or using putty knife. Inspect Water Panel evaporator (Stock No. 12) and replace if necessary with colored spot up. Snap plastic water distribution pan back in place. 7. Reinstall evaporative section in the humidifier with notch and hole in black plastic water distribution pan toward you. Pop nozzle fitting on end of feed tube into black plastic water distribution pan. 8. To reinstall top cover, hook back under lip of metal frame (5), drop in place and tighten two aluminum knobs. 9. Remove drain hose and flush with water under pressure. Lime in hose may be loosened by flexing hose. 10. Reattach drain hose. MODELS 440, 448 & 445 1. Cover Knob 3 4 5 1 2 1 2. Top Cover 11. Turn up humidistat to highest 3. Feed Nozzle setting and make sure the 4. Distribution Tray furnace blower is operating. 5. Metal Frame Humidifier will operate if RH is less than 50%. 12. Set humidistat to its original position. MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODELS 448-445 WARNING! 120 volts may cause serious injury from electrical shock. Disconnect power and shut off water supply before servicing. 1. Note humidistat or c...

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