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MODEL 700
- 12 -
4
5
6
7
8
9
1
2
3
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
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. Inspect the plastic feed tube by gently flexing it and looking for cracks or signs of wear. Replace tube
if it is cracked, brittle, or has been damaged.
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 and flex it to loosen any mineral deposits or
blockage. Then flush it with water under pressure and slip it back onto the drain fitting. Make sure the
drain hose has a constant downward slope and is not flattened or blocked.
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.
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.