Model 600 - Aprilaire 400 Owner's Manual

MAINTENANCE INSTRUCTIONS FOR
APRILAIRE HUMIDIFIER MODEL 600
CAUTION! Sudden operation may cause personal injury or
property damage. Turn Humidifier Control to "off" or
lowest setting before servicing.
1. Front Cover
2. Feed Tube
3. Integral Bypass
Damper
4. Water Panel
Evaporator
Assembly
5. Distribution Tray
6. "V" Notches
7. Water Panel
8. Scale Control
Insert
9. Drain Hose
1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Turn off water supply. Turn the integral bypass damper (3) to the SUMMER position.
3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base
with both hands. Set aside.
4. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water
Panel evaporator assembly (4). Pull this assembly out by grasping at top and tipping out.
5. Unsnap the distribution tray (5) from the scale control insert (8). 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 (6). This textured surface helps ensure
even water flow for maximum performance. See page 3 if removed.
6. Slide the Water Panel evaporator (7) out from the Scale Control Insert (8). Clean the insert
frame of calcium deposits. Replace the Water Panel evaporator (Stock No. 35) and with a
new Genuine Aprilaire Water Panel. Slide the Water Panel back into the scale control insert
with the colored spot up and snap the distribution tray 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 into the unit by fitting its drain into the
round receptacle at the base of the unit. Push the assembly in at the top against the
beveled tabs that will hold it in place. Push the end of the feed tube back firmly into the
distribution tray and replace the front cover.
9. Remove the drain hose (9) from the bottom of the unit and 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. Turn on the water supply. Return integral bypass damper to appropriate position.
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. DO NOT LEAVE IN TEST
MODE AS HUMIDIFIER WILL NOT OPERATE.
12. Set Humidifier Control to its original position.
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