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This installation is used to dehumidify a
whole house and also a separate conditioned
space like a finished basement. Two dampers
are installed, one normally-closed damper
(6508) is installed in the branch leading from
the dehumidifier to the supply duct, and one
normally-open damper (6608) is installed in
the branch leading from the dehumidifier back
to the conditioned space. For convenience, a
basement kit (4522), which includes a
normally-closed damper (6508), a normally-open
damper (6608), and a 40VA, 24 VAC plug in
transformer (8027) can be ordered.
When the HVAC blower and the dehumidifier
are on, the dampers will energize and the
dehumidifier will operate in a whole-house
mode (Figure 4).
When the HVAC blower is off, the dampers
will be de-energized and the dehumidifier will
operate in a localized mode (Figure 5).
Note: The dampers will also be de-energized
when the dehumidifier is off preventing
backflow of air when only the HVAC blower
is on.
WHOLE-HOUSE, WITH LOCALIZED OPTION FOR CONDITIONED SPACE
In this configuration, the dehumidifier will automatically switch between whole-house dehumidification when the HVAC equipment
is on, and localized dehumidification when the HVAC equipment is off.
VENTILATION (OUTSIDE AIR)
CONTROL DAMPER (OPTIONAL)
CONDITIONED SPACE
DEHUMIDIFIER
CONDENSATE HOSE
(TO COMMON DRAIN)
DEHUMIDIFIER CONTROL
WITH SET POINT KNOB
115VAC
SUPPLY DUCT
RETURN DUCT
NORMALLY-CLOSED POWER DAMPER:
OPEN
“T” FITTING
NORMALLY-OPEN POWER DAMPER:
CLOSED
INLET GRILL
OUTLET GRILL
FIGURE 4 – DEHUMIDIFIER OPERATING AS WHOLE-HOUSE SYSTEM
90-778
NORMALLY-OPEN POWER DAMPER:
OPEN
“T” FITTING
NORMALLY-CLOSED POWER DAMPER:
CLOSED
RETURN DUCT
SUPPLY DUCT
115VAC
DEHUMIDIFIER CONTROL
WITH SET POINT KNOB
CONDENSATE HOSE
(TO COMMON DRAIN)
DEHUMIDIFIER
CONDITIONED SPACE
VENTILATION (OUTSIDE AIR)
CONTROL DAMPER (OPTIONAL)
INLET GRILL
OUTLET GRILL
FIGURE 5 – DEHUMIDIFIER OPERATING AS LOCALIZED SYSTEM
90-778
WHOLE-HOUSE CONVERTIBLE TO LOCALIZED DEHUMIDIFIER OPERATION AND INSTALLATION