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WHOLE-HOUSE, RETURN TO SUPPLY
3' MIN
CONDENSATE HOSE
(TO COMMON DRAIN)
VENTILATION (OUTSIDE AIR)
CONTROL DAMPER (OPTIONAL)
RETURN DUCT
DEHUMIDIFIER CONTROL
WITH SET POINT KNOB
SUPPLY DUCT
CONDENSATE HOSE
(TO COMMON DRAIN)
115 VAC
AIR FILTER
ACCESS PANEL
HVAC/FURNACE SYSTEM SHOWN
IN HORIZONTAL ORIENTATION
COOLING COIL
DEHUMIDIFIER
DEHUMIDIFIER CONTROL
WITH SET POINT KNOB
EQUIPMENT ROOM:
• BASEMENT (SHOWN)
• ATTIC (SHOWN)
• GARAGE
• CLOSET
• CRAWL SPACE
DEHUMIDIFIED AIR IS SUPPLIED
DOWN STREAM FROM COOLING COIL TO
MINIMIZE EVAPORATION OFF COOLING COIL
VENTILATION (OUTSIDE AIR)
CONTROL DAMPER (OPTIONAL)
AIR IS PULLED FROM
RETURN DUCT
COOLING COIL
(A-COIL SHOWN)
RETURN
DUCT
SUPPLY DUCT
115VAC
HVAC / FURNACE
DAMPER
(OPTIONAL)
DAMPER
(OPTIONAL)
DEHUMIDIFIED AIR IS SUPPLIED
DOWN STREAM FROM COOLING COIL
TO MINIMIZE EVAPORATION OFF COOLING COIL
In this configuration (Figure 3), the dehumidifier will pull air from the principle living space and return it to the same space. If wired
to the HVAC system (necessary for whole house air cycling, see CONTROL AND SETUP section on page 12 for detailed information),
the dehumidifier will still turn on with the first HVAC blower call in each time interval. If no HVAC blower call occurs during a time
interval or the unit is not wired to the HVAC, the dehumidifier will activate its own internal blower and take an air sample. If the
incoming air is above the set point, the dehumidifier (compressor) will turn on and run until the set point is satisfied. We recommend
air cycling be enabled to move this drier air throughout the house.
PRINCIPLE
LIVING SPACE
SUPPLY DUCT
RETURN DUCT
AIR FILTER ACCESS PANEL
115VAC
HVAC/FURNACE
CONDENSATE HOSE
(TO COMMON DRAIN)
VENTILATION (OUTSIDE AIR)
CONTROL DAMPER (OPTIONAL)
6' MIN.
AIR FILTER
ACCESS PANEL
COOLING COIL
HVAC/FURNACE SYSTEM SHOWN
IN HORIZONTAL ORIENTATION
CONDENSATE HOSE
(TO COMMON DRAIN)
115 VAC
PRINCIPLE
LIVING SPACE
INLET GRILL
DEHUMIDIFIER CONTROL
WITH SET POINT KNOB
SUPPLY DUCT
VENTILATION (OUTSIDE AIR)
CONTROL DAMPER (OPTIONAL)
RETURN DUCT
INLET GRILL
OUTLET
GRILL
DEHUMIDIFIER CONTROL
WITH SET POINT KNOB
6' MIN.
OUTLET GRILL
FIGURE 3 – LOCALIZED DEHUMIDIFIER CONFIGURATION
90-777
90-776
FIGURE 2
LOCALIZED DEHUMIDIFIER OPERATION AND INSTALLATION
This installation (Figure 2) is similar to the “Principle Living Space to Supply” installation, except that the inlet to the dehumidifier
will come from a bypass duct from the HVAC system’s return duct rather than the principle living space.
Note: An optional powered damper (6508) is recommended to be installed on the dehumidifier outlet to prevent airflow from
recirculating through the dehumidifier when the HVAC system is on and dehumidifier is off. A wiring connection is provided. A 24-volt
transformer (not provided) is required to power the damper.
A barometric or other backdraft damper should not be used due to the large pressure drop.