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1. Note Humidifier 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 distribution tray (4) from the water panel evaporator assembly (3) by
unsnapping the 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 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 colored spot up and snap the 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 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 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 and reset change
water panel indicator by setting the knob to “Test/Reset”. With furnace blower operating
and furnace calling for heat, humidifier will operate for one minute.
12. Set Humidifier Control to its original position.
NOTE: The motor is permanently lubricated and does not need to be oiled.
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.
MODEL 700
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