TWO ZONE – PRIMARY AND SECONDARY ZONED INSTALLATION
In this installation the dehumidifier controls the humidity in two separate
zones, Primary and Secondary. The dehumidifier will dehumidify the Primary
Zone as the first priority, and will switch to the Secondary Zone after the
dehumidification needs of the Primary Zone have been satisfied. The dryness
level set on the dehumidifier control knob will be the setting for both zones. If
a Model 76 Control, Model 8910 Home Comfort Control, or Third-Party Control
(external control) is installed, the dehumidifier will control to both the control
knob and external control setting. If an external control is used, it must be
installed in the Primary Zone. Common examples of Two Zone installations
include the whole-home as the Primary Zone and the basement as the
Secondary Zone, or the basement as the Primary Zone and the whole-home
as the Secondary Zone. IMPORTANT: Normally Closed dampers must be
installed in the ducts serving the Primary Zone and Normally Open
dampers installed in the ducts serving the Secondary Zone.
Required Components
Duct Work
18 – 22 AWG Wire
Grilles
2 – Aprilaire Model 6508, 8” Normally Closed Damper
2 – Aprilaire Model 6608, 8” Normally Open Damper
24 VAC Transformer (40VA min.) for Dampers
NOTE: 4522 Basement Kit includes 2 – 6508 Dampers,
2 – 6608 Dampers and a 24 VAC Transformer.
Optional Components
Condensate Pan & Normally Closed Float Switch
Model 76 Control
Model 8910 Home Comfort Control
™
Third-Party Control
FIGURE 17a – Two Zone Installation, Whole-Home as
Primary Zone
FIGURE 17b – Two Zone Installation, Basement as
Primary Zone
NORMALLY CLOSED
DAMPER
NORMALLY OPEN DAMPER
NORMALLY CLOSED
DAMPER
NORMALLY
OPEN DAMPER
SUPPLY TO
SECONDARY ZONE
TO/FROM
PRIMARY ZONE
GRILLE WITH
DUCT COLLAR
(SEE NOTE)
RETURN FROM
SECONDARY AREA
GRILLE WITH DUCT
COLLAR (SEE NOTE)
NORMALLY OPEN
DAMPER
NORMALLY CLOSED DAMPER
NORMALLY OPEN
DAMPER
NORMALLY
CLOSED
DAMPER
SUPPLY TO
PRIMARY ZONE
TO/FROM
SECONDARY ZONE
GRILLE WITH
DUCT COLLAR
(SEE NOTE)
RETURN FROM
PRIMARY AREA
GRILLE WITH DUCT
COLLAR (SEE NOTE)
90-1536 90-1536
DUCTING
Ducting Note: The 1770A delivers approximately 500 CFM and the 1750A delivers approximately 275 CFM. Size ductwork and install multiple
branches and grilles as needed to reduce airflow velocities to acceptable levels for the application.
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