Model 700 - Aprilaire 400 Owner's Manual

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 Assembly
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
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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 front 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. Unsnap the distribution tray (4) from the scale control insert (7). Follow the instructions
below depending upon the type of distribution tray in your humidifier:
For trays with a synthetic fabric liner: Lightly scrape out or brush off any mineral deposits,
being careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar
or a lime-removing agent is helpful when trying to remove stubborn mineral deposits.
For trays with granular coating: Do not scrape off the granular coating, but lightly scrape
out any mineral deposits and clean the "V" notches (5). This textured surface helps ensure
even water flow for maximum performance. See page 3 if removed.
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. Replace the Water
Panel evaporator (Stock No. 35) and with a new Genuine Aprilaire Water Panel. 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. Check the condition of the feed tube and replace if tube is damaged or brittle.
8. 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.
9. 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.
10. Re-install front cover assembly (1) by hooking at the top of the base assembly (2) and
latching at the bottom.
11. Reconnect electrical power (9) and turn on the water supply.
12. 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. DO NOT LEAVE IN TEST
MODE AS HUMIDIFIER WILL NOT OPERATE.
13. Set Humidifier Control to its original position.
NOTE: The motor is permanently lubricated and does not need to be oiled.
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