Aprilaire 110 Installation page 2

No. 10 Water Panel Evaporator Installation
Aprilaire
Model 220 Models 500,
500A & 500M
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1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Turn off water supply. Move 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. 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).
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.
6. Slide the Water Panel evaporator (7) out of the scale control insert
(8). 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 (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 (2) firmly back into the
distribution tray (5) and replace the front cover (1).
9. Remove the drain line (9) 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.
10. Turn on the water supply. Return integral bypass damper (3) to
appropriate position.
11. Check system operation:
Manual Humidifier Control: With the furnace blower operating,
turn up manual humidifier control and check system operation.
Automatic 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, 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.
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
4. Flush the in-line strainer clean or replace with a new strainer, Service
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
10010434 6.13
B2206149A
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Water Line Inspection and Service Instructions for All Models
WATER
FEED TUBE
using a small nail or wire.
Department, Part No. 4004.
for cracks or signs of wear. Replace tube if it is cracked, brittle, or has
been damaged.
P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357 • www.aprilaire.com
Aprilaire
Models 550, 550A & 558
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90-1076
1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Turn off water supply. Move the integral bypass damper (10), if present, to the
SUMMER position.
3. At the side of the humidifier opposite the airflow duct, pull front cover (1) off
holding with both hands and set aside.
4. Carefully pull the feed tube (2) out of the nozzle (3) at the top of the evaporative
assembly (4). Pull this assembly out by grasping at top and tipping out.
5. Remove the distribution tray (5) from the Water Panel evaporator assembly (4) by
unsnapping the plastic ends of the scale control insert (8), from the tabs at the end
of the tray. 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. 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.
6. Slide the Water Panel evaporator (7) out of the scale control insert (8). 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 (5) back into place.
7. Inspect 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. 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 against the beveled tabs that will hold it in place. Push the end of the
feed tube (2) firmly back into the nozzle (3) and replace the front cover (1).
9. Remove the drain line (9) 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.
10. Turn on the water supply. Return integral bypass damper (10), if present, to
appropriate position.
11. Check system operation:
Manual Humidifier Control: With the furnace blower operating, turn up manual
humidifier control and check system operation.
Automatic Humidifier Control: (Automatic or Manual mode) Check system
operation by turning the knob to "Test". With furnace blower operating, humidifier
will operate for one minute. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL
NOT OPERATE. For Controls with Change Water Panel indicator light, turning knob
to "Test/Reset" will reset Change Water Panel indicator.
12. Set Humidifier Control to its original position.
OUTLET
COMPRESSION SOLENOID
ORIFICE
NUT VALVE
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. 4007 (white – Models 110 and 220) or
Part No. 4231 (yellow – Models 500, 500A, 500M, 550, 550A and 558) and
reconnect the water feed tube. Double Wrench to Prevent Leaking.
10. Turn on water supply and reconnect electrical power to the furnace.
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INLET
IN-LINE COMPRESSION
INLET
STRAINER NUT
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90-1053
© 2013 Aprilaire – A division of
Research Products Corporation