HUM Series Owner’s Manual 1
Owner’s Manual
Model HUM-SFTBP, HUM-LFTBP, HUM-FP
Home Humidifiers
Includes Safety, Operating and Maintenance Instructions
Contractor: Fill in for homeowner reference:
Model HUM-SFTBP Model HUM-LFTBP Model HUM-FP
Serial No.
Installation Date
Installing Contractor
IO-634 February 2006
Amana ® is a trademark of Maytag Corporation and is used under license to Goodman Company, L.P.
Goodman® is a registered trademark of Goodman Manufacturing Company, L.P.
HUM Series Owner’s Manual 2
Contents
Principle of Operation..........................................................................................................1
Operating Instructions..........................................................................................................2
Checking for Proper Operation............................................................................................3
Maintenance for Models......................................................................................................4
Water Hardness and Maintenance Schedule........................................................................4
Homeowner Tips..................................................................................................................5
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HUM Series Owner’s Manual 3
About Your Humidifier
Principle of Operation
Your Humidifier uses the same method of evaporation you observe in nature after a
summer shower. Mother Nature’s technique is simple: warm air passes over a thin layer
of water spread over a large area, causing the water to evaporate and raising the level of
humidity. Your humidifier creates the same natural response with an evaporator pad that
dispenses water evenly in front of a warm air stream.
You’ll notice that the evaporator pad has many holes and connecting strands. These
significantly increase the surface from which water can evaporate. This warm air
evaporative process, intensified by the warm air from your furnace, is what makes your
humidifier perform efficiently.
The system is controlled by a humidistat that monitors the relative humidity in your
home, and activates or deactivates the humidifier accordingly. Water evaporated from the
humidifier leaves behind all it impurities (e.g., calcium, iron, lime, bacteria, etc.), thus
creating a purified vapor that doesn’t pollute your indoor air. As a result, your home will
be freer from these contaminants.
How Your Humidifier Works
Models HUM-SFTBP & HUMLFTBP. When your home’s air is dryer than the selected
level of humidity, the humidistat activates the low-voltage solenoid in your humidifier,
allowing water to flow across the unit’s media. Warm, dry air is then forced through the
humidifier cabinet by the furnace blower. As the warm air evaporates the water, the
resulting moist (or humidified) air is circulated throughout your home by the heating
system.
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HUM Series Owner’s Manual 4
Model HUM-FP. (Model HUM-FP operates identically to Models HUM-SFTBP and
HUM-LFTBP, except that warm air is forced through the humidifier cabinet by a
humidifier fan rather than by the furnace blower.)
Operating Instructions
Your new humidifier is controlled by a humidistat that is installed either on the cold air
return of your furnace, or on an interior wall of your home. The recommended settings
for this control may seem illogical until you understand the principle behind them….
As you can see from the Humidistat Settings chart below, the recommended setting goes
down as the outside temperature decreases—just the opposite of how you operate your
furnace’s thermostat. To understand the reason for this, think of what happens to an icecold drink when it’s outside on a hot summer day…water (condensation) forms on the
outside of the glass. Condensation occurs because the hot summer air contains humidity,
and the cold surface of the glass cools the surrounding air. Once cooled, the air molecules
become smaller and can no longer hold as much moisture. The result is that water
droplets accumulate on the glass.
The same principle applies to your home during the winter, when the outside temperature
drops and the inside air remains warm and humid. In order to retain moisture in your
home and prevent condensation, it’s necessary to turn your humidistat down as outside
temperatures fall.
Recommended Humidistat Settings
At Outside Temperature Recommended Setting At Outside Temperature Recommended Setting
-20ºF 15 (Low) + 10ºF 30 (Medium)
-10ºF 20 + 20ºF 30 (Medium-High)
0ºF 25 (Low-Medium) Above 20ºF 40
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Checking the Humidifier for Proper Operation
To check your humidifier for proper operation after servicing or winter startup, follow
these procedures:
1. Turn the furnace blower to the OFF position, making sure the solenoid valve is
closed.
2. Turn the furnace blower ON and set the humidistat to the ON position. The solenoid
valve should open.
3. Make sure the water flow from the solenoid falls directly into the distribution tray.
(The solenoid valve should limit the flow to approximately four gallons per hour at a
line pressure of 60 PSI.)
4. To avoid overflow, run the humidifier long enough to be sure the drain tubing is
carrying water to the waste line.
WARNING: DO NOT SET HUMIDITY CONTROL TOO HIGH. Use the
recommended settings shown on the humidistat cover plate.
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HUM Series Owner’s Manual 6
Maintenance Instructions for Models
HUM-SFTBP, HUM-LFTBP & HUM-FP
DANGER: TO AVOID ELECTRICAL SHOCK OR BURN, turn off power
supplying this equipment before servicing!
1. Shut off water supply.
2. Remove the humidifier cover by turning the screw located at the bottom of the cover
and pulling the cover out toward you.
3. Tilt out the distribution tray and evaporator pad assembly.
4. Wash all plastic and metal parts (except electrical parts and components) in
humidifier cleaner or a 50% solution of vinegar and water.
5. If cleaning is not satisfactory, replace evaporator media. This unit also contains a one-
piece wick. This wick must be changed along with the evaporator pad. The wick can
easily be changed by lifting out the old one and replacing it with the new wick
provided with the evaporator pad.
6. Evaporative media should be replaced at least once a year (once each heating season).
7. Wipe any loose sediment from the water tray, making certain no particles are allowed
to plug the drain hole.
Water Hardness and Maintenance Schedule
Your humidifier will accumulate minerals, such as calcium and lime, after operating for a
short period. (Accumulation of minerals is a sure sign the humidifier is producing
humidity.) The amount of accumulation is dependent on the hardness of the water supply
in your area. Therefore, the time between cleaning is unpredictable.
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NOTE: Excessive buildup of these minerals is detrimental to internal parts as well as
evaporative efficiency. Refer to the maintenance instructions above to achieve years of
satisfactory performance from your Humidifier.
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HUM Series Owner’s Manual 8
Homeowner Tips
• In a home that has had little or no humidification, allow approximately three weeks
for your new humidifier to attain the desired humidity level. Your furniture,
woodwork, carpeting, plaster, houseplants and family members all need time to
absorb lost moisture.
• To eliminate drafts that allow heat and humidified air to escape, keep fireplace
dampers closed when not in use.
• If excessive moisture appears on windows or walls, reduce the humidity setting on
your humidistat. If the situation continues, turn off the water valve and consult your
HVAC contractor.
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