Aprilaire 110 MODELS 445-448

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MAINTENANCE INSTRUCTIONS for

1. Note humidistat or 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 up and remove top cover (2)

from humidifier.

4. 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.

5. Tip forward and lift the complete plastic framed evaporative

section out of the humidifier.

6. To remove plastic water distribution tray from evaporative

section, 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 lime-removing agent is helpful when trying to remove

stubborn mineral deposits.

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.

7. 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, if

necessary, with colored spot up.

8. Re-install water distribution tray. Reinstall evaporative section in the humidifier,

with notch and hole in distribution tray toward you. Pop hose fitting on end of feed

tube into distribution tray.

9. See page 15 for reservoir and pump cleaning.

MODELS

440, 445 & 448

1. Cover Knob

2. Top Cover

3. Feed Nozzle

4. Distribution Tray

5. Metal Frame

MODELS 445-448