Model 558; Models 560 & 568 - Aprilaire 110 Owner's Manual

MAINTENANCE INSTRUCTIONS for
APRILAIRE HUMIDIFIER MODELS 558-560-568
CAUTION! Sudden operation may cause personal injury or
property damage. Turn humidistat or control to "off" or lowest
setting before servicing.
1
1. Note humidistat or Humidifier Control setting and turn dial to the "OFF" position.
2. Turn off water supply.
3. At the side of the unit opposite the airflow duct pull front cover (1) off holding with both hands
and set aside.
4. Carefully pull the plastic feed tube (2) out of the nozzle (3) at the top of the Water Panel
evaporative assembly (4). Pull this assembly out by grasping at top and tipping out.
5. Remove the plastic distribution tray (5) from the evaporative assembly by unsnapping the
plastic holding strips from the tabs at the end of the tray. Follow 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. 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 plastic Scale Control Insert (8). Clean the
insert frame by twisting and flexing it to loosen the calcium deposits, or use a putty knife.
Inspect the Water Panel evaporator (Stock No. 35 for Model 560) and substitute a new one if
necessary. Slide the pad back into the insert frame with the colored spot up and snap the
distributor tray 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 evaporative 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 nozzle and replace
the front cover.
9. Remove the drain hose (9) from the bottom of the unit and flex it to loosen the internal mineral
deposits. Then flush it with water under pressure and slip it back onto the black drain fitting.
Make sure the drain hose has a constant downward slope and is not flattened or blocked.
10. Turn on water supply.
11. Check system operation:
Manual Humidistat: Turn up humidistat to highest setting and make sure the furnace blower
is operating. Humidifier will operate if RH is less than 50%.
Humidifier Control: Check system operation by setting the knob to "Test." With furnace
blower operating and furnace calling for heat, humidifier will operate for one minute.
12. Set humidistat or Control to its original position.
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7
9
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4
8
1. Front Cover
2. Feed Tube
3. Nozzle
4. Water Panel
Evaporative Assembly
5. Distribution Tray
6. "V" Notches
7. Water Panel
8. Scale Control Insert
9. Drain Hose