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.
MODELS 440-448-445
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%.
5 | 3 |
2 |
|
| 4 |
1 | 1 |
|
MODELS
440, 448 & 445
1. Cover Knob
2. Top Cover
3. Feed Nozzle
4. Distribution Tray
5. Metal Frame
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.
9.See page 12 for reservoir and pump cleaning.
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