Aprilaire 220 - Manual (Page 12)

APRILAIRE HUMIDIFIER MODELS 768-760
WARNING! 120 volts may cause serious injuiv from electrical shock. Disconnect
power and shut off water supply before servicing.
MAINTENANCE INSTRUCTIONS
for
1. Front Cover
2. Base
3. Evaporative
Assembly
4. Distribution Tray
5. ”V” Notches
6. Water Pane!
7. Scale Control Insert
8. Drain Hose
9. Power Cord
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1. Note humidistat or control setting and turn dial to the “OFF” position.
2. Disconnect electrical power and turn off water supply,
3. Unlatch humidifier cover assembly (1) from base assembly {2) at the bottom of the
cover, lift, and set aside.
4. Pull out the evaporative assembly (3} by grasping at the top and tipping out,
5. Remove the black distribution tray (4} from the evaporative assembly (3) by unsnap­
ping the white plastic holding strips from the tabs at the end of the tray. Lightly scr^e
out any calcium deposits and clean the “V” notches {5} but
do not scrape off the
granular coating from the bottom. This textured surface helps ensure even water
flow for maximum performance.
6. Slide the Water Panel evaporator {6) out from the white plastic sc^e control insert {7).
Cleén ihe insert frame by twisting and flexing it to loosen the cácium deposits or use
a putty knife. Replace Water Panel evaporator annually with a new Water Panel evapo­
rator (Stock No. 35). Slide toe Water Pane! evaporator back into the scale control insert
with the red colored spot up and snap the Wack distribution tray (4) back into place.
7. Re-install the evaporative assembly (3) into the base assembly (2). Push the evaporative
assembly (3) in at the top between the retaining ribs that hold the asssnbly in place in
a vertical position.
8. Remove the drain hose (8} from the bottom of the unit. Bend and flex it to loosen the
internal calcium deposits. Then flush it with water under pressure ^d slip it back onto
the drain fitting.
9. Reinstall cover assembly (1) by hooking at the top of the base assembly (2) and
latching at the bottom.
10. Reconnect electrical power (9) turn on the water supply.
11. Check system operation:
Manual Humidistat: Turn up humidistat to highest setting and make sure the
furnace blower is operating. Humidifier will operate if BH is less than 50%.
Automatic Humidifier Control: Check system operation by setting the knob
to “Test.” With furnace blower operating and furnace calling for heat,
humidifier will operate for one minute.
12. Set humidistat or control to its original position.
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