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MODELS 440-448-445
MAINTENANCE INSTRUCTIONS for
APRILAIRE HUMIDIFIER MODEL 440
CAUTION! Sudden operation may cause personal injury or property damage. Turn
humidistat to “off” or lowest setting before servicing.
1. Note humidistat setting and turn dial to the “Off” position.
2. Remove two aluminum knobs (1), swing up and remove top cover (2) from
humidifier.
3. 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.
4. Tip forward and lift the complete plastic framed evaporative assembly out of the
humidifier.
5. To remove black plastic water distribution pan from evaporative assembly,
push down on pan and out on white plastic frame (Scale Control Insert). Clean “V”
openings in water distribution section of upper housing but do not scrape off
granular coating from bottom. This helps to ensure proper even water flow for
maximum performance.
6. Remove Water Panel evaporator from Scale Control Insert and clean Insert by flexing
or using putty knife. Inspect Water Panel evaporator (Stock No. 12) and replace if
necessary with colored spot up. Snap plastic water distribution pan back in place.
7. Reinstall evaporative section
in the humidifier with notch
and hole in black plastic
water distribution pan
toward you. Pop nozzle fit-
ting on end of feed tube into
black plastic water distribu-
tion pan.
8. To reinstall top cover, hook
back under lip of metal frame
(5), drop in place and tighten
two aluminum knobs.
9. Remove drain hose and flush
with water under pressure.
Lime in hose may be loos-
ened by flexing hose.
10. Reattach drain hose.
11.Turn up humidistat to highest
setting and make sure the
furnace blower is operating.
Humidifier will operate if RH
is less than 50%.
12. Set humidistat to its original position.
MAINTENANCE INSTRUCTIONS for
APRILAIRE HUMIDIFIER MODELS 448-445
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 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 page 12 for reservoir and pump cleaning.
MODELS
440, 448 & 445
1. Cover Knob
2. Top Cover
3. Feed Nozzle
4. Distribution Tray
5. Metal Frame
3
4
5
1
2
1
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