Installation manual

RETURN AIR
DIRECT CONNECTION of the SUPPLY AIR STREAM to the FURNACE COLD AIR RETURN
(Stale air drawn from key areas of the home)
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
Exhaust Air from different
areas of the home
(bathrooms, kitchen)
Partially Dedicated Installation Diagrams (150ERV and 200ERV)
Partially Dedicated System
This installation enables stale air to be drawn from the
poorest air quality areas of the home (bathrooms,
kitchen).
Key Points
• The ERV must be balanced.
• It is recommended that the furnace blower run
continuously or ERV operation be interlocked with the
furnace blower to evenly distribute the fresh air
throughout the house.
• 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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