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MAINTENANCE INSTRUCTIONS
for
APRILAIRE HUMIDIFIER MODELS 768-760
i
WARNING! 120 volts may cause serious injury from electrical shock, Disconnect
power and shut off water supply before servicing,
1. Front Cover
2. Base
3. Evaporative /
Assembly
4. Distribution Tray
5. "V" Notches
6. Water Panel
7. Scale Control Insert
8. Drain Hose
9. Power Cord
1. Note humidistat or control setting and turn dial to the "OFF" position.
2. Disconnect alectrical power and turn off water supply.
3. Unlatch humidifiercover 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. Removethe black distributiontray (4)from the evaporativeassembly(3)by unsnap-
pingthe whiteplasticholdingstripsfrom thetabsat theend ofthetray. Lightlyscrape
out anycalcium depositsand cleanthe "V" notches (5)but do not scrape off the
granular coatingfrom the bottom. This texturedsurfacehelps ensureevenwater
flow formaximumperformance.
6. Slide the Water Panel evaporator (6) out from the white plastic scale control insert(7).
Clean the insert frame by twisting and flexing it to loosenthe calcium deposits or use
a putty knife. Replace Water Panel evaporator annually with a new Water Panel evapo-
rator (Stock No. 35). Slide the Water Panelevaporator back into the scale control insert
v_r[hthe red colored spot up and snapthe b4ackdistribution tray (4)back into place.
7. Reinstall 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 assembly in place in
avertical position.
8. Remove the drain hose (8)from the bottom of the unit. Bend and flex it to loosen the
intemal calcium deposits. Then flush it with water under pressure and 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)and tum on the water supply.
11. Check system operation:
Manual Humidiatat: Tum up humidistat to highest setting and make sure the
furnace blower is operating. Humidifier will operate if RH 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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