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
90-153690-153690-1536
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