Installation manual

RETURN AIR
DIRECT CONNECTION of both the ERV SUPPLY AIR STREAM and
EXHAUST AIR STREAM to the FURNACE COLD AIR RETURN
Stale Air to
Outside
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.
3' min.
recommended
Forced Air
Furnace
Spring-Loaded Backdraft Damper
Install the Backdraft Damper with the leaf hinge vertical.
The damper is installed on the “Stale Air to Outside Collar”.
6” (152mm) Backdraft Damper Part No. 99-RSK6
The Stale Air to Outside air duct requires
a Backdraft Damper. This damper prevents
outdoor air from entering the ERV
during the operation of the Furnace/
Airhandler while the ERV is in either
standby or OFF.
WARNING
Fresh Air from
Outside
Dampers for balancing air flows
Spring Loaded Backdraft Damper
40” (1 m) MINIMUM
Simplified Installation Diagrams (150ERV and 200ERV)
Simplified Installation (Return/Return Method)
Key Points
• The ERV must be balanced.
• It is mandatory that the furnace blower run
continuously or ERV operation be interlocked with
the furnace blower.
• The duct configuration may change depending on
the 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/Airhandler is running and the unit
is in either Standby or OFF.
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 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.
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