Installation Guide
Fits Models 112, 136, 224, 440, 445 & 445A. Also Fits Chippewa
®
Models 224 & 225
NOTE: Replacement instructions on reverse side. For peak performance, change annually,
using only genuine Aprilaire Water Panels.
Stock No. 12
For Aprilaire Humidifiers Models
112, 136, 224, 440, 445 & 445A
and Chippewa
®
Humidifiers
Models 224 & 225
Stock No. 12
Stock No. 12
For Aprilaire Humidifiers Models
112, 136, 224, 440, 445 & 445A
and Chippewa
®
Humidifiers
Models 224 & 225
Stock No. 12
For Aprilaire Humidifiers Models
112, 136, 224, 440, 445 & 445A
and Chippewa
®
Humidifiers
Models 224 & 225
10006965
B2204197C
For continued
trouble-free performance,
check feed tube and drain line
when replacing Water Panel.
See instructions on back.
You can enjoy the ultimate in comfort, convenience, and preservation with the #60 Aprilaire
®
Automatic Digital Humidifier Control. Its exclusive, automated “no-touch” operation enables your
humidifier to provide up to 50% more moisture, while eliminating the need for constant manual
adjustments. This results in optimum humidity levels as outdoor temperatures change – all
automatically. For installation or more information, contact your heating and cooling contractor.
AIR FILTER UNIT
AS TO FLAMMABILITY ONLY
697A
Aprilaire has a full range of indoor air quality solutions that work together to make your home more healthy, comfortable and energy efficient. From whole-home
air cleaners and humidity control to ventilation and zoned temperature solutions, we can help you maintain an optimum indoor environment for your home and family.
For more information about the Aprilaire family of whole-home comfort solutions, visit www.aprilaire.com.
1. Note humidistat setting and turn dial to the “OFF” position.
2. Turn off water supply.
3. Remove the three “Z” clips (1) that hold the top half of
humidifier to furnace plenum.
4. Slide off four closure clips (2 & 3) that hold the two humidifier
halves together.
5. Loosen compression fitting (4) on copper feed tube (5) and
remove.
6. Remove top screw holding sheet metal ductwork to humidifier.
7. Remove top half of humidifier (lift straight up). Remove water
distribution pan cover (6) and remove any mineral deposits
from the “V” notches. DO NOT scrape off granular coating
from the bottom. This textured surface helps ensure even
water flow for maximum performance. If the granular coating
has been removed, place several drops of liquid dishwashing
soap on the distribution tray. This will only need to be done
once if there is no granular coating.
8. Remove Water Panel evaporator and scale control insert
(if used).
9. Remove Water Panel evaporator from scale control insert
(if used). Clean scale control insert of mineral deposits.
If scale control insert is not used, contact your dealer about
obtaining one.
10. Install a new Water Panel evaporator, with colored spot UP,
in scale control insert (if used), or directly into the humidifier if
insert is not used. IMPORTANT: When installing scale control
insert and Water Panel evaporator into the humidifier, the
insert spout must discharge directly into the drain.
11. Remove drain line (7) from the bottom of the humidifier. If
applicable, flex it to loosen internal mineral deposits or
blockages. 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.
12. Following Water Panel evaporator replacement and
maintenance, reassemble humidifier.
13. Turn on water supply.
14. Check system operation: With the furnace blower operating
and the furnace calling for heat, turn up humidistat and check
system operation.
15. Set humidistat to its original position.
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Aprilaire / Chippewa
Model 224
Aprilaire
Models 440, 445 & 445A
Aprilaire Model 112
(Serial number 84647 and higher)
1. Note humidistat setting and turn dial to the “OFF” position.
2. Disconnect electrical power and turn off water supply.
3. Disconnect: a) 120 volt electrical service.
b) Copper water supply line (1) and feed tube (2).
c) Drain line (7). d) 24 volt leads (8).
4. Turn two swing locks (3), one at either side of lower housing of
humidifier flange.
5. Lift humidifier straight up until bottom of humidifier clears lip of
lower housing. Pull humidifier out at bottom, lower and remove.
6. Slide off three closure clips (4 & 5) that hold 2 halves of humidifier
together.
7. Remove upper half of humidifier. Remove water distribution pan
cover (6) and remove any mineral deposits from the “V” notches.
DO NOT scrape off granular coating from the bottom. This textured
surface helps ensure even water flow for maximum performance. If
the granular coating has been removed, place several drops of liquid
dishwashing soap on the distribution tray. This will only need to be
done once if there is no granular coating.
8. Remove Water Panel evaporator and scale control insert (if used).
9. Remove Water Panel evaporator from scale control insert (if used).
Clean scale control insert of mineral deposits. If scale control insert
is not used, contact your dealer about obtaining one.
10. Install a new Water Panel evaporator, with colored spot UP, in
scale control insert (if used), or directly into the humidifier if insert is
not used. IMPORTANT: When installing scale control insert and
Water Panel evaporator into the humidifier, the insert spout must
discharge directly into the drain.
11. Remove drain line (7) from the bottom of the humidifier. If applicable,
flex it to loosen any mineral deposits or blockages. 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.
12. Following Water Panel evaporator replacement and maintenance,
reassemble humidifier.
13. Reconnect electrical power.
14. Turn on water supply.
15. Check system operation: With the furnace blower operating and the
furnace calling for heat, turn up humidistat and check system
operation.
16. Set humidistat to its original position.
120 Volts may cause serious injury from electrical shock. Disconnect power and shut off water supply before servicing.
WARNING
Water Line Inspection
and Service Instructions
for All Models
The humidifier is equipped
with an in-line water strainer.
See the following instructions
for strainer cleaning.
1. Disconnect electrical power to the furnace and
shut off water supply.
2. Disconnect the water line at the inlet
compression nut.
3. Remove the in-line strainer from inside the inlet
side of the valve by using a small nail or wire.
4. Flush the in-line strainer clean or replace with a
new strainer, Service Department, Part No. 4004.
5. Reconnect the inlet water line. Double Wrench
to Prevent Leaking.
6. Disconnect the water feed tube at the outlet
compression nut.
7. Inspect the water feed tube (plastic only) by
gently flexing it and looking for cracks or signs of
wear. Replace tube if it is cracked, brittle, or has
been damaged.
8. Remove the orifice from the copper or plastic
water feed tube and make sure this small
opening is unplugged.
9. Replace the orifice with Part No. 4232 (blue –
Model 440) or Part No. 4021 (red – Models 112
and 224) and reconnect the water feed tube.
Double Wrench to Prevent Leaking.
10. Turn on water supply and reconnect electrical
power to the furnace.
90-1053
INLET
COMPRESSION
NUT
INLET
SOLENOID
VALVE
ORIFICE
OUTLET
COMPRESSION
NUT
IN-LINE
STRAINER
WATER
FEED TUBE
1. Note Humidifier Control setting
and turn dial to the “OFF” position.
2. Disconnect electrical power and turn off water supply.
3. Remove two aluminum knobs (1). Swing top cover up and remove from humidifier.
4. Place finger under white feed nozzle (3) at top of water distribution tray (4). Lift up to pop feed
nozzle loose from hole and notch in distribution tray.
5. Pull out the water panel evaporator assembly by grasping at the top and tipping out.
6. Unsnap the distribution tray (4) from the scale control insert. 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 (5). This textured surface helps ensure even
water flow for maximum performance. If the granular coating has been removed, place several
drops of liquid dishwashing soap on the distribution tray. This will only need to be done once if
there is no granular coating.
7. Slide the Water Panel evaporator out from the scale control insert. Clean the scale control insert
of mineral deposits. Slide the new Water Panel evaporator into the scale control insert with the
colored spot up and snap the distribution tray (4) back into place.
8. Inspect 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.
9. Reinstall the Water Panel evaporator assembly into the humidifier (with the hole in the
distribution tray toward you) by fitting its drain directly over the round receptacle at the base of
the humidifier. Push the assembly in at the top to a vertical position. Pop feed nozzle (3) on the
end of the feed tube into hole and notch in distrubution tray (4).
10. Replace top cover (2) hooking back of cover under lip of metal frame (5) and tighten two knobs (1).
11. Remove the drain line (if applicable) from the bottom of the humidifier. Flex it to loosen any
mineral deposits or blockage. Then flush it with water under pressure. If it does not 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.
12. Reconnect electrical power and turn on the water supply.
13. Check system operation:
Manual Humidistat: With the furnace blower operating and the furnace calling for heat,
turn up humidistat and check system operation.
Humidifier Control: (Automatic or Manual mode) Check system operation and reset
Change Water Panel indicator by turning 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.
14. Set Humidifier Control to its original position.
NOTE: For additional instructions for cleaning the reservoir on Models 445 & 445A, see
Owner’s Manual.
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Aprilaire • P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357 • www.aprilairepartners.com
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