OVERVIEW
The Aprilaire
®
Dehumidifier is designed to control humidity inside the whole home . The dehumidifier uses a dew point calculation to control the
humidity based on the dryness setting on the dehumidifier control . An optional Model 76 Control, Model 8910 Home Comfort Control
™
, or other
third-party control can be used in place of the onboard control .
Do not use a dehumidifier to prevent window condensation in the winter . Indoor humidity levels must typically get lower than what dehumidifiers
can achieve during cold winter months . Use ventilation to lower indoor humidity levels in the winter .
The dehumidifier has a built in feature to allow ventilation or air cycling . Air cycling allows activation of the HVAC fan to cycle air throughout the
home for airflow balance and comfort . Ventilation brings fresh air into the home and is designed to meet ASHRAE 62 .2 Standard for Ventilation .
There are three main installation options, Single Zone – Ducted to HVAC System, Single Zone – Not Ducted to HVAC System, Two Zone –
Primary and Secondary Zoned .
SINGlE ZONE – DUCTED TO HVAC
SySTEM,
see page 7
SINGlE ZONE – NOT DUCTED TO
HVAC SySTEM,
see page 9
TWO ZONE – PRIMARy AND
SECONDARy ZONED,
see page 11
In a Single Zone – Ducted to HVAC System
installation, the dehumidifier works in
conjunction with the HVAC system, offering
the optimum solution for year-round, whole-
home control . This installation is typically
in basement or attic locations . In a typical
setup, air is pulled from the return duct,
dehumidified, and returned to the return or
supply duct . Alternate duct configurations
are possible .
In a Single Zone – Not Ducted to HVAC
System installation, the dehumidifier is not
ducted to the HVAC system and is used to
dehumidify a specific area . This installation
is typically in basements or crawl spaces,
with the dehumidifier ducted to the area
requiring dehumidification .
In a Two Zone – Primary and Secondary
Zoned installation, the dehumidifier controls
humidity in two zones . The dehumidifier
will dehumidify the primary zone as the first
priority, switching to the secondary zone
after the primary zone dehumidification need
has been met .
RETURN
DUCT
SUPPLY DUCT
DEHUMIDIFIER
HVAC / FURNACE
LIVING
SPACE
SUPPLY DUCT
RETURN DUCT
DEHUMIDIFIER
HVAC FURNACE
SUPPLY DUCT
RETURN
DUCT
90-1536
90-1536
90-1536
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