Aprilaire 1850W, 1850 User Manual
Model 1830, 1850 & 1850W Dehumidifier
Owner’s Manual
PLEASE LEAVE THIS MANUAL WITH THE HOMEOWNER
Installed by: _________________________________ Installer Phone: _______________________ Date Installed: _______________
ON/OFF button
used to turn
dehumidifier on
and off
MODE button
used for optional
ventilation feature
Up/ Down
buttons used to
change humidity
setting
Dehumidifer Control
Inlet Filter Access
Door
Outlet
Drain Power
Switch
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WHOLE HOME DEHUMIDIFICATION
The Aprilaire® Dehumidifier controls the humidity level in your entire home. A powerful blower inside the dehumidifier draws air into the cabinet,
filters the air and removes moisture, then discharges the dry air into the HVAC system or dedicated area of the home. Inside the cabinet, a
sealed refrigeration system removes moisture by moving the air through a series of tubes and fins that are kept colder than the dew point of
the incoming air. The dew point is the temperature at which moisture in the air will condense, much like what occurs on the outside of a cold
glass on a hot summer day. The condensed moisture drips into the dehumidifier drain pan to a drain tube routed to the nearest floor drain or
condensate pump. After the moisture is removed, the air moves through a second coil where it is reheated before being sent back into the home.
The air leaving the dehumidifier will be warmer and drier than the air entering the dehumidifier.
You can reduce the amount of humidity that enters the home by closing windows, doors, and fireplace flues when outdoor humidity is high,
and by drying clothes outside. Direct exhaust from kitchen vents and bath fans is the best means of controlling humidity due to cooking and
showers/baths. The dehumidifier is not designed to prevent window condensation in winter. Use ventilation to lower indoor humidity levels
in the winter.
SETTING THE DESIRED HUMIDITY LEVEL
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The dehumidifier on-board control will display the humidity setting when not running,
and displays the measured humidity when running.
The UP and DOWN arrow buttons allow the humidity level to be set from 40% to 80%
relative humidity. Use the ON/OFF button to turn the dehumidifier ON or OFF.
Set the control at 55%RH when first
installed. Allow the dehumidifier to run
until it reaches the setting before deciding
if you want to change the setting.
• Ifyouprefertheairtobemoredry,
decrease the humidity setting.
• Ifyouprefertheairtobelessdry,
increase the humidity setting.
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Your comfort is the best measure of how to adjust your setting. When first installed,
your dehumidifier has to remove all the moisture that is initially in your home. The home
acts like a sponge so the moisture in the materials of your home is at the same level as
the air. After drying the air, the materials of the home will release moisture back into
the air until they are again at the same level. As a result, it is not uncommon for the
dehumidifier to operate for an extended period when first installed.
HOW DOES THE DEHUMIDIFIER WORK?
ENERGY SAVINGS TIPS
EnergySavingsTip#1: Adjust the humidity
setting to be as high as is comfortable to
reduce dehumidifier run time. If it feels
clammy or “smells musty”, lower the humidity
setting. To save energy, turn the dehumidifier
to OFF when you open your windows, just as
you would with air conditioning.
EnergySavingsTip#2: If vacating your home
for an extended period in the summer, set the
RH at 55% and set your thermostat as high as
you are comfortable setting it to in the cooling
mode. Consult with appropriate professionals
regarding the highest temperature that is safe
for your pets or possessions. This will keep the
humidity at a controlled level while minimizing
the amount of cooling energy used.
Once per hour the dehumidifier will measure the humidity level of the air and compare it to the humidity setting. If the humidity in your home is
higher than the setting, the dehumidifier will dehumidify the air until the humidity level drops below the setting. NOTE: The dehumidifier will
continue to dehumidify until the humidity level is 3%RH below the setting.
When the dehumidifier turns on, the blower circulates the air for 3 minutes before measuring the
humidity level of the air. The on-board control will display AIR SAMPLING, along with the measured
humidity on the control screen.
If the humidity of the air is higher than the setting, the compressor turns on and the control will display
DEHUMIDIFYING, along with the measured humidity on the control screen.
Your dehumidifier is equipped with two features that protect against unwanted energy consumption. Defrost is a normal operating mode that
helps to prevent significant ice formation on the refrigeration system coil. The dehumidifier display will show “DEFROSTING” when operating
in this mode. This mode can occur when there is not enough air moving through the dehumidifier or if the temperature and/or humidity of
the incoming air is too low. The second protection feature is the E8 code. E8 on the dehumidifier display indicates that the air entering the
dehumidifier is below 50°F or above 104°F, or the dew point of the incoming air is below 40°F. There would be a significant reduction in
dehumidifier efficiency if the dehumidifier operated outside of these conditions. Low dew point conditions can be seen in some basements
or crawl spaces and usually occur in the Winter and Spring months. The dehumidifier continues to monitor the incoming air and when the
conditions are within the operating range, E8 will be removed from the display and dehumidification will begin as needed.
OPTIONAL – HEATING AND COOLING SYSTEM BLOWER OPERATION
Your installing contractor may have configured the dehumidifier to turn on the heating and cooling system blower when the dehumidifier turns on
to allow for improved circulation of the dry air.
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