Maintenance Instructions:
Aprilaire Models 440, 445 & 445A
1. Note Humidifier Control setting and turn dial to the “OFF” position.
2. Disconnect electrical power and turn off water supply.
3. Remove two aluminum knobs (1). Swing top cover up and remove from
humidifier.
4. Place finger under white feed nozzle (3) at top of water distribution tray (4).
Lift up to pop feed nozzle loose from hole and notch in distribution tray.
5. Pull out the water panel evaporator assembly by grasping at the top and
tipping out.
6. Unsnap the distribution tray (4) from the scale control insert. Follow the
instructions below depending upon the type of distribution tray in your
humidifier:
a. 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 lime-removing
agent is helpful when trying to remove stubborn mineral deposits.
b. For trays with granular coating: Do not scrape off the granular
coating. Lightly scrape out any mineral deposits and clean the “V”
notches (5). This textured surface helps ensure even water flow for
maximum performance. If the granular coating has been removed,
place several drops of liquid dishwashing soap on the distribution tray.
This will only need to be done once if there is no granular coating.
7. Slide the Water Panel evaporator out from the scale control insert. Clean the
scale control insert of mineral deposits. Slide the new Water Panel evaporator
into the scale control insert with the colored spot up and snap the
distribution tray (4) back into place.
8. Inspect feed tube by gently flexing it and looking for cracks or signs of wear.
Replace tube if it is cracked, brittle, or has been damaged.
9. Reinstall the Water Panel evaporator assembly into the humidifier (with the
whole in the distribution tray toward you) by fitting its drain directly over the
round receptacle at the base of the humidifier. Push the assembly in at the
top to a vertical position. Pop feed nozzle (3) on the end of the feed tube into
hole and notch in distribution tray (4).
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