Model 500; Model 600 - Aprilaire 600 Owner's Manual

REQUIRED MAINTENANCE INSTRUCTIONS
(APRILAIRE HUMIDIFIER MODELS 500 & 600)
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
Evaporator
8. Scale Control Insert
9. Drain Line
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 2 if removed.
6. Slide the Water Panel evaporator (7) out from the scale control insert (8). Clean the scale
control insert of mineral deposits. Replace the Water Panel evaporator (Stock No. 35 for
Model 600 and Stock No. 10 for Model 500) 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 (5) 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. Reinstall the Water Panel evaporator assembly (4) into the humidifier by fitting its drain into the
round receptacle at the base of the humidifier. Push the assembly in at the top until it snaps into
place. Push the end of the feed tube back firmly into the distribution tray and replace the front cover.
9. Remove the drain line (9) from the bottom of the humidifier. If applicable, flex it to loosen any
mineral deposits or blockage. Then flush it with water under pressure. If it does not properly
clear, replace it. Slip drain line back onto the drain fitting. Make sure the drain line 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:
Manual Humidistat (Model 500): With the furnace blower operating and the furnace calling
for heat, turn up Humidistat and check system operation.
Humidifier Control (Model 600): (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 Manual Humidistat or Humidifier Control to its original position.
CAUTION
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