MAINTENANCE INSTRUCTIONS for
APRILAIRE HUMIDIFIER MODEL 440
CAUTION! Sudden operation |
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may cause personal injury or |
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property damage. Turn |
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humidistat to “off” or lowest |
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setting before servicing. | 1 |
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1. Note humidistat setting and turn |
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dial to the “Off” position. |
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2. Remove two aluminum knobs (1), swing up and remove top cover (2) from humidifier.
3. Place finger under plastic water nozzle (3) at top of water distribution tray (4). Lift up to pop
outlet loose from hole and notch in distribution tray.
4. Tip forward and lift the complete plastic framed evaporative assembly out of the humidifier.
5. To remove plastic water distribution tray from evaporative assembly, push down on pan and out on plastic frame (Scale Control Insert). Follow instructions below depending upon the type of distribution tray in your humidifier.
For trays with a synthetic fabric liner: Lightly scrape out or brush off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar or a
For trays with granular coating: Do not scrape off the granular coating, but lightly scrape out any mineral deposits and clean the “V” notches. This textured surface helps ensure even water flow for maximum performance. See page 3 if removed.
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 tray back in place.
7.For units with plastic feed tubes, inspect the tube by gently flexing it and looking for cracks or signs of wear. Replace tube if it is cracked, brittle or has been damaged.
8.Reinstall evaporative section in the humidifier with notch and hole in plastic water distribution pan toward you. Pop nozzle fitting on end of feed tube into plastic water distribution pan.
9.To reinstall top cover, hook back under lip of metal frame (5), drop in place and tighten two aluminum knobs.
10.Remove drain hose and flush with water under pressure. Mineral deposits in hose may be loosened by flexing hose.
11.Reattach drain hose. Make sure the drain hose has a constant downward slope and is not flattened or blocked.
12.Turn humidistat to highest setting and make sure the furnace blower is operating. Humidifier will operate if RH is less than 50%.
13.Set humidistat to its original position.
MODEL 440
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