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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 water panel evaporator assembly (3) by grasping at the top and tipping
out.
5. Remove the black distribution tray (4) from the water panel evaporator assembly (3) by
unsnapping the white plastic holding strips from the tabs at the end of the tray. Lightly
scrape 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 Scale Control Insert (7).
Clean the
Scale Control Insert
by twisting and flexing it to loosen the calcium
deposits or use a putty knife. Inspect the Water Panel evaporator (Stock No. 35) and
replace with a new Genuine Aprilaire Water Panel if necessary. Slide the Water Panel
evaporator back into the scale control insert with the red colored spot up and snap the
black distribution tray (4) back into place.
7. Re-install the water panel evaporator assembly (3) into the base assembly (2). Push it in
at the top between the retaining ribs that hold the assembly in place in a vertical posi-
tion.
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 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 turn on the water supply.
11.
Check system operation:
Humidifier Control:
(Automatic or Manual) Check system operation by set-
ting the knob to “Test.” With furnace blower operating and furnace calling
for heat, humidifier will operate for one minute.
12.
Set Humidifier or control to its original position
.
MAINTENANCE INSTRUCTIONS
for
APRILAIRE HUMIDIFIER MODEL 700
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. Water Panel Evaporator
Assembly
4. Distribution Tray
5. ”V” Notches
6. Water Panel
7. Scale Control Insert
8. Drain Hose
9. Power Cord
MODEL 700