Backdraft Damper
Leaf Hinge
Installed Vertically
(Recommended)
Outdoors
Damper for
balancing
airflows
Return Air
Cold Air
Return
Forced Air
Furnace
Stale Air to Outside
Airflow:
Fresh Air from Outside
Stale Air from Inside
Fresh Air to Inside
The simplified method draws stale air from the cold air return duct of the air handler/furnace
and introduces an equal amount of fresh air farther downstream into the cold air return as
illustrated in the following figures.
Key Points
The ERV unit must be balanced.
• It is mandatory (to eliminate recirculation) that either the furnace blower run continuously
or ERV unit operation be interlocked with the furnace blower.
* Refer to “Interlocking ERV to Air Handler / Furnace Blower” on page 24.
• The duct configuration may change depending on the ERV model. See specifications for
your unit.
• Check local codes and authority having jurisdiction for acceptance.
Installation Methods - Simplified (Return/Return)
Figure 13. Simplified Installation (Return/Return)
Figure 12. Simplified Installation (Return/
Return)
Installation Notes:
• See unit specifications for exact port locations.
• Unit is normally balanced on HIGH speed with the furnace blower ON.
• Ensure as much distance as possible between the supply and exhaust connections to the cold air return of the furnace.
• The exhaust air connection should be upstream of the supply air connection to prevent exhausting any fresh air.
• Weatherhood arrangement is for drawing purposes only. The weatherhoods are to be installed in accordance with local building
codes or manufacturer recommendations.
• The airflow can be confirmed on site using the balancing procedures found in this manual.
Residential Energy Recovery Ventilators
15
®
