Aprilaire 10-112 Maintenance Instructions Manual Download Page 9

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1. Note humidistat or Humidifier Control setting and turn dial to the “OFF” position.
2. Disconnect electrical power and turn off water supply.
3. Unlatch humidifier cover assembly (1) from base assembly (2) at the bottom of the cover, lift, and

set aside.

4. Pull out the evaporative assembly (3) by grasping at the top and tipping out.
5. Remove the distribution tray (4) from the evaporative assembly (3) 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 (6) out from the plastic scale control insert (7). Clean the insert

frame by twisting and flexing it to loosen the mineral deposits or use a putty knife. Replace Water
Panel evaporator annually with a new Water Panel evaporator (Stock No. 35). 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 evaporative assembly (3) into the base assembly (2). Push the evaporative assembly

(3) 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. Flex it to loosen the internal mineral

deposits. 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. Reinstall 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:

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.

13. Set humidistat or Humidifier Control to its original position.