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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/ERV must be balanced.
• It is recommended that the furnace blower run
continuously or HRV/ERV operation be interlocked
with the furnace blower to evenly distribute the fresh air
throughout the house.(Refer to "Interlocking the
HRV/ERV to an Air Handler/Furnace Blower.")
• 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/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.
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.
• 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 the SUPPLY AIR STREAM to the FURNACE COLD AIR RETURN
(Stale air drawn from key areas of home)
EXHAUST AIR from various parts of home.
i.e. bathrooms (if required), kitchens (if required).
Outdoors
Backdraft
Damper
(not included)
Return Air
Dampers for
balancing
airflows
leaf hinge
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.
15
3' min.
recommended
Cool Air
Return
Forced Air
Furnace
WARNING
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