Models 220 & 224 - Aprilaire 110 Owner's Manual

MAINTENANCE INSTRUCTIONS for
APRILAIRE HUMIDIFIER MODELS 220-224
CAUTION! Sudden operation may cause personal injury or property
damage. Turn humidistat to "off" or lowest setting before servicing.
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1. Note Humidistat setting and turn dial to the "off" position.
2. Turn off water supply and turn down humidistat.
3. Remove three "Z" clips (1) that hold top half of unit to furnace plenum.
4. Slide off four closure clips (2 & 3) that hold two halves of unit together.
5. Loosen compression fitting (4) on copper feed tube (6) and remove.
6. Remove top screw holding sheet metal elbow to humidifier.
7. Remove top half of unit (lift straight up).
8. Remove the water distribution pan cover (5) and clean "V" openings in water
distribution section but do not scrape off granular coating from bottom. This helps
to insure proper, even water flow for maximum performance. See page 3 if removed.
9. Remove Water Panel evaporator and Scale Control Insert. Remove Water Panel
evaporator from Insert and clean Insert by flexing or using putty knife. Inspect
Water Panel evaporator and replace with a new Water Panel evaporator
(Stock No. 10 for Model 220 and Stock No. 12 for Model 224), with colored spot up.
10. Remove the drain hose from the bottom of the unit and flex it to loosen the internal
calcium deposits. Then flush it with water under pressure and slip it back onto the
black drain fitting. Make sure the drain hose has a constant downward slope and is
not flattened or blocked.
11. IMPORTANT: When installing the Scale Control Insert and Water Panel evaporator
in the humidifier, the Insert spout must discharge directly into unit drain.
12. Reassemble unit, position feed tube in compression fitting, tighten compression
nuts and secure copper feed tube to upper housing with feed tube clamp. Attach to
furnace plenum.
13. Turn on water supply, turn up humidistat and check unit operation.
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1. "Z" Clip
2. Closure Clip
3. Closure Clip
4. Compression Fitting
5. Distribution Pan Cover
6. Feed Tube