Aprilaire 8840 User Manual

INDOOR AIR QUALITY FUNCTIONS
HUMIDITY CONTROL (continued)
Manual Mode
In manual mode, it is important to anticipate
a drop in outdoor temperature and to reduce
the setting accordingly to avoid excessive
condensation. Use the table on the right side of
the Humidifier Control screen to determine the
proper RH setting.
4. Touch the or arrows to adjust the
RH accordingly, and then touch Done when
finished.
Dehumidification
The thermostat will allow you to set the desired
RH level in your home and can be used to turn
dehumidification on or off.
5. Touch the arrow to increase the amount
of humidity the dehumidifier will allow. The
air will be less dry and the dehumidifier will
run less.
6. Touch the arrow to decrease the amount
of humidity the dehumidifier will allow. The
air will be less humid and the dehumidifier
may run more.
If dehumidification is done with the air
conditioner, the thermostat will cool up to 3°F
beyond the cooling setpoint for dehumidification.
Note: Overcooling may not be sufficient to meet
the dehumidification setpoint.
Use the dehumidification adjustment to set the
dehumidification setpoint to 60% when first
installed. Allow dehumidification to run until the
initial setpoint is reached, before deciding if you
want to change the humidity setting.
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 the
moisture back into the air until they are again at
the same level. As a result, it is not uncommon
for dehumidification to operate for an extended
period of time when it is first installed.
Energy Saving Tip #1: Adjust the setting to be as high as is comfortable
to reduce dehumidification run time – if it feels clammy or smells damp or
moldy, lower the setting. Set the Dehumidifier Control to Off when you open
your windows.
Energy Saving Tip #2: If your home will be unoccupied for an extended
period during the summer, set the Dehumidifier Control setpoint to 60%
RH and your cooling setpoint as high as you feel comfortable. Consult
appropriate professionals regarding the highest temperature that is safe for
your pets or possessions. This will keep the humidity at a controlled level to
help prevent mold while minimizing the amount of the cooling energy used.
Vacation hold is a convenient way to adjust the dehumidification and cooling
setpoint while you are away.
29
4
5
6

Aprilaire 8840 Specifications

General

Brand	Aprilaire
Model	8840
Category	Thermostat
Language	English