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Partially Dedicated System
Installation Notes
The HRV/ERV must be balanced.
Unit should be balanced on high speed with the furnace
blower on.
It is recommended that the furnace blower run
continuously or HRV/ERV operation be interlocked with
the furnace blower. Refer to building code.
The duct configuration may change depending on the
HRV/ERV model.
A backdraft damper is recommended in the exhaust air
duct to prevent outdoor air from entering the unit.
The airflow must be confirmed on site using the
balancing procedures found in this guide.
Spring-Loaded Backdraft Damper (Recommended)
Install the Backdraft Damper with the leaf hinge vertical. The damper is installed on the "Stale Air to
Outside Collar"
EXHAUST AIR from various parts of home. i.e.
bathrooms (if required), kitchens (if required)
Outdoors
Attention/Warning
Check local codes/authority having jurisdiction for acceptance.
Applications such as greenhouses, atriums, swimming pools, saunas, etc. have unique ventilation requirements
which should be addressed with an isolated ventilation system.
Weatherhood arrangement is for drawing purposes only. Check local codes/authority having jurisdiction for
acceptance.
Backdraft dampers are recommended for the stale air to outside air duct. This damper prevents outdoor air from
entering the HRV/ERV during the operation of the furnace/air handler while the HRV/ERV is in standby, off, or
recirculating.
Dampers for
balancing
airflows
Backdraft Damper
Leaf Hinge
Installed Vertically
(Recommended)
RETURN AIR
Cool Air
Return
Forced Air
Furnace
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