MODEL 448
MAINTENANCE INSTRUCTIONS
for
APRILAIRE HUMIDIFIER MODEL 448
WARNING! 120 volts may cause serious injury from electrical shock. Disconnect
power and shut off water supply before servicing.
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 distribu-
tion 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 nec-
essary, 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 page 9 for reservoir and pump cleaning.
MODEL
448
1. Cover Knob
2. Top Cover
3. Feed Nozzle
4. Distribution Tray
5. Metal Frame
3
4
5
1
2
1