24
Installation Methods - Partially Dedicated
The partially dedicated installation draws stale air from specific points in the house and introduces an equal amount of
fresh air into the cold air return as illustrated in the following figures.
Figure 20. Partially Dedicated System
Stale air ducts should be installed in areas of the home where the poorest indoor air quality exists (bathrooms and kitch-
en). Each location with a stale air duct should have a timer to initiate high−speed ventilation. Refer to “H/C 20/40/60 Minute
Timer (Y2169) (Optional) and H/C Ventilation Wireless Timer (Y8251)” on page 21.
The air handler/furnace blower should be running when the HRV is operating to evenly distribute the fresh air throughout
the house. Refer to “Interlocking ERV/HRV Blower to Air Handler/Furnace Blower” on page 33.
Key Points
The ERV/HRV must be balanced.
• It is recommended that the furnace blower run continuously or ERV/HRV operation be interlocked with the furnace
blower to evenly distribute the fresh air throughout the house. Refer to building code.
•
The duct configuration may change depending on the ERV/HRV model. See specifications for your unit.
• Check local codes and authority having jurisdiction for acceptance.
Installation Notes
See unit specifications for exact port locations.
Unit is normally balanced on HIGH speed with the furnace blower ON.
The airflow must be confirmed on site using the balancing procedures found in this manual.
Forced Air
Furnace
Cool Air
Return
Dampers for
Balancing
Airflows
Return Air
Outdoors
EXHAUST AIR from various parts of home.
(i.e. bathrooms, kitchens, utility areas)
36"
(914mm) Min.
Recommended
Leaf Hinge
Install the Backdraft Damper with the leaf hinge vertical.
The
5" (127 mm) Backdraft Damper (Y3728)
6" (152 mm) Backdraft Damper (Y3727)
Spring−Loaded
Backdraft
Damper
Weatherhoods are to be installed in accordance with local building codes or
manufacturer recommendations.
Figure 21. Direct Connection of Supply Air Stream to the Furnace Cold Air Return
(Stale air drawn from key areas of home)
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