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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. Inspect the plastic feed tube (2) 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 (4) 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 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. 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.
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
MODEL 600