Powered Flow-Through Humidifier
PRODUCT DATA
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
this unit may not exactly match the listed specifications. Also, this product is tested and calibrated
under closely controlled conditions and some minor
differences in performance can be expected if those
conditions are changed.
Models Available:
Includes humidifier, antimicrobial humidifier pad, mounting
template, self-piercing saddle valve and Convertible Humidity
Control.
Capacity:
At 120 °F (49 °C) plenum temperature and 0.20 static
pressure drop across supply and return: 18 gallons per day
(gpd), 68 liters per day (lpd).
APPLICATION
The Powered Flow-through Humidifiers use the warm air
furnace blower to provide humidification for the whole house.
FEATURES/BENEFITS
• Antimicrobial coating on pad prevents the surface
growth and migration of bacteria, mold, fungus and
algae on the humidifier pad.
• Bold look with blue and white styling.
• Capable of humidifying up to 4200 sq ft (390 sq m).
• Includes water distribution tray for optimal efficiency
and water usage.
• Narrower footprint than popular compatible model
while maintaining a common humidifier pad and
comparable humidification performance.
• Interior components designed for quick maintenance
and service.
• Humidifier includes a convertible humidity control that
mounts on the wall or duct for more flexibility.
• Continuous flushing reduces the frequency of
maintenance in a hard water installation.
Humidified Area:
House
Description
Loose Two 1,900 175
Average One 2,700 248
Tight One-half 4,200 386
Electrical Ratings:
120 Vac, 60 Hz, 0.7A.
Humidifier Pad Dimensions (height x width x depth):
13 in. x 10 in. x 1-1/2 in. (330 mm x 254 mm x 38 mm).
Plenum Opening Dimensions (height x width):
14-1/16 in. x 13-1/2 in. (357 mm x 343 mm).
Drain Connection:
1/2 in. (13 mm) I.D. plastic hose connected directly to drain fit-
ting on unit.
Dimensions:
Refer to Fig. 1.
Air Changes
Per Hour
Area (Up To)
Sq ft. Sq m.
68-3074-01
POWERED FLOW-THROUGH HUMIDIFIER
CAUTION
CAUTION
M28930
15-1/4
(387)
14 (356)
10-1/4 (260)
Fig. 1. Humidifier dimensions in in. (mm).
Approvals:
Underwriters Laboratories Inc.: 56BL.
Canadian Underwriters laboratories Inc.: 56BL.
Standards:
Air Conditioning and Refrigeration Institute Tested: Standard
610.
Accessories:
HC26E Humidifier Antimicrobial Pad.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service technician.
4. After installation is complete, check out product operation as provided in these instructions.
Property or Equipment Hazard.
Can cause property or equipment damage.
• Locate the humidifier where the ambient
temperature is between 32°F (0°C) and 160°F
(71°C).
• Do not install where freezing temperatures could
occur.
• Be sure supply plenum static pressure is no greater
than 0.4 in. wc and water pressure is no greater than
125 psi.
Location and Mounting
IMPORTANT
Mount the humidifier at least 3 in. (76 mm) above the
furnace jacket to allow adequate space for the drain
line. Check that there is adequate space above the
humidifier to remove and install the humidifier cover.
Do not install on a furnace jacket.
1. Determine the best location for the humidifier and draw a
level line on the plenum. See Fig. 2 and 3.
IMPORTANT
Be sure the template is level before marking to assure
optimal product performance.
2. Tape the template in position and trace around the template.
3. Remove the template and carefully cut the rectangular
opening.
4. Loosen the thumbscrew on the bottom of the humidifier
and remove the cover.
5. Remove the humidifier pad assembly by grasping the top
of the tray and pulling the assembly out of the housing.
See Fig. 4.
6. Position the securing clips as shown in Fig. 5. Do not
completely seat them.
RETURN
HORIZONTAL
Personal Injury or Equipment Hazard. Improper
drilling can cause equipment damage or personal
injury.
Do not cut or drill into any air conditioning or electrical
accessory.
68-3074—01 2
RETURN
RETURN
RETURN
LOWBOY
DOWN
FLO
Fig. 2. Typical humidifier installation locations.
HIGHBOY
M12808B
Fig. 3. Humidifier location in relation to air conditioning coils.
WARNING
M12812
M12813
CLIP
CLIP
HUMIDIFIER
MECHANICAL
HUMIDISTAT
120 VAC
TO BLOWER
MOTOR
IGNITION BOX
M12686
YELLOW WIRES
1
1
2
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
24V WIRING.
CURRENT
SENSING
RELAY
HUMIDIFIER
120 VAC
BLOWER
MOTOR
C
LO
HI
M12684
YELLOW WIRES
1
1
2
2
POWER SUPPLY.
PROVIDE DISCONNECT
MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
24V WIRING.
MECHANICAL
HUMIDISTAT
FEED TUBE NOZZLE
WATER
DISTRIBUTION TRAY
HUMIDIFIER
PAD ASSEMBLY
HUMIDIFIER
THUMB
SCREW
COVER
ASSEMBLY
HOUSING
M28929
POWERED FLOW-THROUGH HUMIDIFIER
WIRING HUMIDIFIER
Serious Personal Injury or Equipment Hazard.
Moving parts can cause electrical shock and injury.
• Disconnect power supply before installation or
servicing.
• This device contains a moving fan blade; do not
operate the humidifier without the cover securely
attached.
All wiring must comply with applicable local codes, ordinances
and regulations.
For Convertible Humidity Control Wiring
Connections:
IMPORTANT
• Select models of fan centers include humidifier taps
so the current sensing relay or sail switch is not
needed.
• If not using a current sensing relay or sail switch, the
120V humidifier plug must be energized during
blower motor cycles for proper operation.
1. Wire the current sensing relay or sail switch.
2. Connect only the two yellow wires to the humidity control
(red wire connections are not used for mechanical
humidity control). See the typical wiring diagrams in Fig.
6 through 8.
For additional mounting and wiring information, refer to the
humidity control installation instructions.
Fig. 4. Humidifier components.
Fig. 5. Position securing clips.
7. Position the humidifier housing in the hole (be sure it is
level), so the locking tabs are in place on the upper and
lower sheet metal edges of the hole.
8. Push in the securing clips until completely seated.
9. Drill holes and install the three sheet metal screws at the
top of the humidifier housing. Secure the housing with
the three remaining screws at the bottom of the housing.
10. Reinstall the humidifier pad assembly in the humidifier
housing.
IMPORTANT
For proper operation, be sure the mark on the end of
the humidifier pad is facing up. Check that the water
11. Hook the top of the cover to the housing and secure with
feed tube is placed in the guide slots of the humidifier
housing.
the thumbscrew located at the bottom of the cover.
Fig. 6. Typical wiring diagram for humidifier using fan
control to cycle blower motor fan and humidifier
simultaneously.
Fig. 7. Typical wiring diagram of current sensing relay with
humidifier.
3 68-3074—01
POWERED FLOW-THROUGH HUMIDIFIER
CAUTION
SAIL
SWITCH
HUMIDIFIER
120 VAC
M12685
YELLOW WIRES
1
1
2
2
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
24V WIRING.
MECHANICAL
HUMIDISTAT
Fig. 8. Typical wiring diagram of sail switch with
humidifier.
CHECKING INSTALLATION
1. Open the saddle valve.
NOTE: The furnace blower must be operating for the humidi-
fier to work.
2. Set the thermostat setpoint 10 °F (12 °C) above the room
temperature.
3. Set the humidity control to a high humidity setting, or
place the humidity control in the test position.
4. Observe the water running out of the drain line to be sure
the humidifier is working correctly.
5. Check for leaks.
6. Reset the thermostat and humidity control to comfortable
settings.
Plumbing Saddle Valve
Hot or cold water, either hard or softened, can be used in the
humidifier.
1. Use the self-piercing saddle valve included to tap into the
water supply line at an appropriate location.
Equipment Hazard.
Improper installation can cause equipment
damage.
Do not use any line connected to an air conditioner.
IMPORTANT
• The saddle valve is not designed to regulate water
flow; the valve is either open or closed.
• Be sure to install the saddle valve handle pointing
toward the ceiling to prevent debris from clogging the
solenoid in-line filter.
NOTE: Lightly clean the copper tubing ends with fine sandpa-
per before making any connections.
2. Use 1/4 in. O.D. copper tubing and connect the saddle
valve to the inlet side of the solenoid valve.
a. Place the brass compression nut over the copper
tubing.
b. Slide the brass ferrule over the tubing.
OPERATING HUMIDIFIER
The humidifier is controlled by the Convertible Humidity
Control. The convertible humidity control is installed either on
an interior wall in the living area, or on the return air duct.
Choose the humidity control setting using the combination
relative humidity/outdoor temperature setting scale on the
humidity control dial.
Match the dial setting to the outdoor temperature for optimizing
the humidity level to reduce the moisture condensation on your
windows. The table below can also be used to adjust the
humidity control to the recommended setting.
NOTE: As outside temperature drops, the recommended
humidity control setting is lowered to accommodate
the effects of dewpoint. These settings should reduce
the accumulation of moisture and ice on the windows
and in other areas of the house.
Some indoor activities such as cooking, showering and clothes
drying can cause excessive levels of humidity and start the
accumulation of moisture on the windows. If this condition
persists for more than a few hours, set the humidistat to the
lowest setting to turn off the humidifier. If the condition does not
improve, ventilate the house to remove the moisture.
OPERATION
NOTE: Do not over-tighten the compression nut. Moderate
tightness prevents leaking.
c. Insert the tubing into the solenoid valve fitting and
support the valve while tightening the compression
nut.
3. Connect a 1/2 in. hose to the humidifier drain fitting and
run it to a suitable drain.
NOTE: Slope the hose downward for correct drainage.
68-3074—01 4
The humidifier uses the principle that vapor (evaporated water)
is created when warm dry air blows over a water-soaked area.
As the vapor circulates, the relative humidity rises.
The humidity control monitors the relative humidity and
activates the humidifier accordingly. The humidifier has a water
supply that disburses water over a humidifier pad. The warm
dry air from the furnace passes over the humidifier pad,
collects moisture, and circulates it through the house.
Since humidified air feels warmer and more comfortable, the
homeowner may decide to lower the thermostat setpoint, thus
saving money on heating bills. The end result is that the
humidifier provides a more comfortable environment that is
also energy efficient.
POWERED FLOW-THROUGH HUMIDIFIER
CAUTION
Table 1. Recommended Humidity Control Settings.
Outside Temperature Recommended Setting Outside Temperature Recommended Setting
-20°F (-29°C) 15 +10°F (-12°C) 30
-10°F (-23°C) 20 +20°F (-7°C) 35
0°F (-18°C) 25 +20°F (-7°C) 40
MAINTENANCE
A regular maintenance program prolongs the life of the
humidifier and provides a more comfortable environment.
Frequency of cleanings depends on water conditions.
Either hard or soft water can be used in the humidifier, but hard
water mineral deposits are more difficult to clean then soft
water deposits.
Use the following procedure to clean the humidifier.
Personal Injury or Equipment Hazard.
Power Supply can cause electrical shock or
equipment damage.
Disconnect power supply before performing humidifier
maintenance.
IMPORTANT
Every 1 To 3 Months
(Depending on Water Quality)
Never oil any part of the humidifier.
1. Disconnect the power and turn off the humidifier water
supply.
2. Remove the humidifier cover. See Fig. 9.
FEED TUBE NOZZLE
WATER
DISTRIBUTION TRAY
HUMIDIFIER
PAD ASSEMBLY
5. Gently pinch the water nozzle catches inward until the
water nozzle can be lifted off the tray.
6. Slide the humidifier pad out of the frame.
7. Carefully scrape any mineral deposits from the tray and
frame. Be sure the frame drain hole has nothing blocking
it.
8. Check the humidifier pad and if excessive mineral
deposits are present, replace with a new HC26E Antimicrobial Pad.
9. Disconnect the drain hose from the drain fitting on the
bottom of the humidifier housing.
10. Clean the drain fitting, if necessary.
11. Bend the drain hose to loosen any mineral deposits.
12. Flush the drain hose with pressurized water (a running
tap) to clean the hose.
13. Reattach the drain hose to the drain fitting.
14. Slide the humidifier pad back into the frame.
IMPORTANT
To maintain the antimicrobial properties of the humidifier, use only an HC26E Antimicrobial Pad. Be sure
the marked side of the antimicrobial humidifier pad is
facing up for proper performance.
15. Reattach the tray to the frame.
16. Snap the water nozzle back on the tray.
17. Place the antimicrobial humidifier pad assembly in the
humidifier housing and press until the assembly is
seated.
18. Be sure the water feed tube is placed in the guide slots
of the humidifier housing.
19. Replace the humidifier cover.
20. Verify the humidifier operation by following the steps in
the Checkout Procedure section.
End of Humidification Season
The humidifier needs to be cleaned and shut off at the end of
the heating season. Follow steps 1 through 19 from the Every
1 To 3 Months section.
THUMB
SCREW
3. Remove the humidifier pad assembly from the humidifier
by grasping the tray and pulling it toward you.
4. Pull one side of the humidifier pad assembly frame
toward you and remove the tray from the frame.
HUMIDIFIER
COVER
ASSEMBLY
HOUSING
M28929
Fig. 9. Location of humidifier parts.
IMPORTANT
Be sure the humidifier power is off.
Beginning of Humidification Season
Refer to the Checkout Procedure section for complete
humidifier startup instructions.
Vacation
Turn off the humidifier water supply and the humidity control
while on vacation. When you return, turn on the humidifier
water supply and reset the humidity control to restart the
humidifier.
5 68-3074—01
POWERED FLOW-THROUGH HUMIDIFIER
CHECKOUT PROCEDURE
After winter startup or servicing, use the following steps to
check the humidifier operation.
1. Turn on the humidifier power and water supply.
2. Turn the humidity control to its highest setting and set the
thermostat to 10 °F (12 °C) above the room temperature.
3. Observe that water is flowing out of the drain hose.
NOTE: The furnace blower must be operating for the humidi-
fier to work.
4. Reset the thermostat and humidity control to a comfortable setting for automatic operation.
TROUBLESHOOTING
Refer to Table 2 for troubleshooting procedures.
Table 2. Troubleshooting Procedures.
Problem What To Look For What To Do
• Reset circuit breaker or check for blown fuse.
Furnace blower not operating.
Low humidity
Rapid air changes. Drafts (cold air is dry
and is an added load to the humidifier).
Condensation on walls.
High humidity
Heavy condensation on windows.
• Check that the furnace power is on.
• Check all external wiring connections.
• Check the humidity control setting.
• Call a professional heating contractor.
• Keep doors and windows closed.
• Close fireplace damper when not in use.
• Keep exhaust fan running time to a minimum.
• Seal around doors and windows.
• Turn off humidity control and water until condensation is
completely evaporated.
• Turn humidity control down low enough to eliminate
condensation caused by moisture from bathing, mopping,
cooking, etc. If moisture persists, more ventilation is needed.
REPLACEMENT PARTS
Refer to Fig. 10 and Table 3 when ordering replacement parts.
Table 3. List of Replacement Parts.
1 Water Distribution Tray 32001630-001
2 Solenoid Valve Assembly (Includes water feed tube) 32001876-001
3 Antimicrobial Humidifier Pad HC26E1004
4 PWB Assembly 32001676-001
5 Bag Assembly, Saddle Valve 32001616-001
6 Convertible Humidity Control H8908ASPST
Not Shown Hardware Kit for Solenoid Assembly (same as Solenoid Valve Assembly without the solenoid valve) 32001752-001
68-3074—01 6
POWERED FLOW-THROUGH HUMIDIFIER
1
M28931
2
5
3
6
4
Fig. 10. Key to Replacement Parts.
7 68-3074—01
POWERED FLOW-THROUGH HUMIDIFIER
® U.S. Registered Trademark
© 2010
68-3074—01 M.S. 08-10
Printed in U.S.A.
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