Aprilaire 448 Owner's Manual

APRILAIRE HUMIDIFIER MODELS 448-445A-445
WARNING! 120 volts may cause serious injury from electrical shock. Disconnect power and shut off water supply
before servicing.

Maintenance Instructions

1. Note humidistat or 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 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.
5. Tip forward and lift the complete plastic framed evaporative section out of the humidifier.
6. To remove black plastic water distribution pan from evaporative section, push down on pan and out on white plastic
frame (Scale Control Insert). Clean "V" openings in water distribution panel but do not scrape coating off bottom
surface.
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 black water distribution pan. Reinstall evaporative section in the humidifier, with notch and hole in
distribution pan toward you. Pop hose fitting on end of feed tube into distribution pan.
9. See below for reservoir and pump cleaning.
MAINTENANCE INSTRUCTIONS
for
Key
1. Cover Knob
2. Top Cover
3. Feed Nozzle
4. Distribution Tray
5. Metal Frame