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Simplified Installation Diagrams
Simplified Installation (Return/Return Method)
Key Points
• The HRV/ERV must be balanced.
• It is mandatory that the furnace blower run continuously or
HRV/ERV operation be interlocked with the furnace
blower. (Refer to "Interlocking the HRV/ERV to an Air
Handler/Furnace Blower.")
• The duct configuration may change depending on the
HRV/ERV model. See specifications for your unit.
• Check local codes / authority having jurisdiction for
acceptance.
• A backdraft damper is required in the exhaust air duct to
prevent outdoor air from entering the unit when the
Furnace/Air Handler is running and the unit is in Standby,
OFF or Recirculate.
Sizing the Ductwork
It is the responsibility of the installer to ensure all ductwork is
sized and installed as designed to ensure the system will
perform as intended.
The amount of air (cfm) that an HRV/ERV will deliver is
directly related to the total external static pressure (E.S.P.) of
the system. Static pressure is a measure of resistance imposed
on the blower by length of duct work plus the number of
fittings used in the duct work.
Outdoors
Spring-Loaded Backdraft Damper
Install the Backdraft Damper with the leaf hinge vertical.
The damper is installed on the "Stale Air to Outside Collar".
4" (102mm) Backdraft Damper Part No. 99-RSK4
5" (127mm) Backdraft Damper Part No. 99-RSK5
6" (152mm) Backdraft Damper Part No. 99-RSK6
8" (203mm) Backdraft Damper Part No. 99-RSK8
Installation Notes
• Unit is normally balanced on HIGH speed with the furnace blower ON.
• A minimum separation of 40 inches (1m) is recommended between the
two direct connections.
• 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. Six feet (2m)
minimum separation is recommended. The Weatherhood must also be 18"
(460mm) above grade minimum.
• The airflow must be confirmed on site using the balancing procedures found in this manual
All manuals and user guides at all-guides.com
DIRECT CONNECTION of both the HRV SUPPLY AIR STREAM and
DIRECT CONNECTION of the SUPPLY AIR STREAM and
EXHAUST AIR STREAM to the FURNACE COLD AIR RETURN
EXHAUST AIR STREAM to the FURNACE COLD AIR RETURN.
RETURN AIR
Backdraft
Damper
40" (1m) MINIMUM
Dampers for
balancing
airflows
Leaf Hinge
(not included)
14
3' min.
recommended
Cool Air
Return
Forced Air
Furnace
WARNING
The Stale Air to Outside air duct requires
a Backdraft Damper. This damper prevents
outdoor air from entering the HRV
during the operation of the Furnace/
Air Handler while the HRV is in standby,
OFF or Recirculate.
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