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positively or negatively, depending upon the inside and
outside air conditions. Consult the factory by calling 1-
800-255-7749 for recommendations regarding the use
of higher flows with your specific application.
The outside air duct should be connected to the 6”
round collar on the filter enclosure of the unit. The 6”
round collar includes a manual damper. Adjust the
manual damper to provide the desired amount of fresh
air for ventilation. The amount of fresh air should be
based on the size and occupancy of the residence. If
you are unsure of your ventilation air requirements,
consult the factory by calling 1-800-255-7749 for
assistance.
2.4D Constant Airflow Regulator and Vent
Hood Options
American ALDES offers the fresh air vent hood and
constant airflow regulators (CAR) to control the amount
of fresh air entering the home. These are used in lieu
of the manual damper in the 6” collar on the main unit.
The CAR, inserted in the vent hood collar,
automatically maintains the desired airflow,
independent of pressure. A CAR is recommended for
installations where the DHV draws return air from a
shared HVAC system return duct, to avoid excessive
ventilation when the HVAC fan cycles on. If the indoor
air return is independent of the HVAC system, the CAR
is not necessary, as the manual damper may be set to
the desired airflow.
2.4E Installation in a Basement or Crawl
Space with an Existing Forced Air
HVAC System
If the structure in which the DHV-150H is to be installed
has an existing forced air HVAC system, utilize the
HVAC system to make the DHV-150H installation
easier.
Basement Installation: Install a separate return for the
DHV-150H in a central area of the structure. Duct the
supply of the DHV-150H to a 10” x 10” x 10”
tee/damper that is 30% open to the basement. Duct the
other side of the tee to the air supply of the existing
HVAC system. Connect an insulated duct from outside
to the 6” collar of the DHV-150H if you wish to provide
optional fresh make-up air.
Crawl Space Installation: Install a separate return for
the DHV-150H in a central area of the structure. Duct
the supply of the DHV-150H to a 10” x 10” x 10”
tee/damper that is 30% open to the crawl space if
desired. Duct the other side of the tee to the air supply
of the existing HVAC system. Connect an insulated
duct from outside to the 6” collar of the DHV-150H if
you wish to provide optional fresh make-up air.
2.4F Installation in an Attic with an
Existing Forced Air HVAC System
ALWAYS install a catch pan with a drain or float
interrupt for condensate under the DHV-150H in an attic
or condensate may drip down on the ceiling of the living
space below.
Locate a separate return for the DHV-150H in a central
area of the structure. Duct the supply of the DHV-150H
to the air supply of the existing HVAC system. Connect
an insulated duct from outside to the 6” collar of the
DHV-150H if you wish to provide fresh make-up air.
2.4G Installation in a Structure with Two
Forced Air HVAC Systems
Attach the DHV-150H return to an independent return
from the upper level. Attach the DHV-150H supply to
the supply of the basement HVAC system. This will
promote circulation of air through the whole structure
from the upper level to the lower level through the
DHV-150H. If the DHV-150H is not connected to both
areas, it will not control the humidity and ventilation of
the entire structure. Connect an insulated duct from
outside to the 6” collar of the DHV-150H if you wish to
provide fresh make-up air.
2.4H Installation in a Structure with No
Existing Forced Air HVAC System
When installing the DHV-150H in a structure that does
not have a forced air HVAC system, a single return for
the DHV-150H should be installed in central open area
of the structure. DO NOT locate the return in a
bathroom or a kitchen. The supply of the DHV-150H
should be located in the remote areas of the structure
(such as bedrooms, den, etc.). By ducting this way, the
air inside the structure will circulate through the DHV-
150H to be filtered and dehumidified. 4" diameter duct
is recommended for branches to the bedrooms, 6"
diameter duct is recommended for branches to larger
areas. Refer to section 2.4B for branch duct sizing.
Connect an insulated duct from outside to the 6” collar
of the DHV-150H if you wish to provide fresh make-up
air.