DIRECT CONNECTION of the SUPPLY AIR STREAM to the FURNACE COLD AIR RETURN
(Stale air drawn from key areas of home)
Forced Air
Furnace
Outdoors
EXHAUST AIR
from various parts of home.
i.e. bathrooms (if required), kitchens (if required).
Cool Air
Return
Return Air
3' min.
recommended
Installation Notes
• Unit is normally balanced on HIGH speed with the furnace blower ON.
• 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.
Dampers for
balancing
airflows
Backdraft
Damper
leaf hinge
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
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/
Airhandler while the HRV is in standby,
OFF or Recirculate.
WARNING
Partially Dedicated Installation Diagrams
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 HRV must be balanced.
• It is recommended that the furnace blower run
continuously or HRV operation be interlocked with
the furnace blower to evenly distribute the fresh air
throughout the house.
• The duct configuration may change depending on the
HRV 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 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 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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