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Installation MethodsSimplified (Return/Return)
Simplified Installation (Return/Return Method)
The simplified method draws stale air from the cold air re-
turn duct of the air handler/furnace and introduces an
equal amount of fresh air farther downstream into the cold
air return (see figures 8 and 9).
Key points
S
The HRV
/
ERV unit must be balanced.
S
It is mandatory (to eliminate recirculation) that either
the furnace blower run continuously or HRV
/
ERV unit
operation be interlocked with the furnace blower.
S
The duct configuration may change depending on the
HRV
/
ERV model. See specifications for your unit.
S
Check local codes and authority having jurisdiction for
acceptance.
Figure 8. Simplified Installation (Return/Return)
Installation Notes
S
See unit specifications for exact port locations.
S
Unit is normally balanced on HIGH speed with the furnace blower ON.
S
A minimum separation of 40 inches (1m) is recommended between the two direct connections.
S
The exhaust air connection should be upstream of the supply air connection to prevent exhausting any fresh air.
S
Weatherhood arrangement is for drawing purposes only. Six feet (2m) minimum separation is recommended. The
weatherhood must be 18" (460mm) above grade minimum.
S
The airflow must be confirmed on site using the balancing procedures found in this manual.
Forced Air
Furnace
Cool Air
Return
36"
(914mm) Min.
Recommended
Dampers for
Balancing
Airflows
40" (1 m)
Minimum
Outdoors
Return
Air
Return Air
Leaf Hinge
Install the Backdraft Damper with the leaf hinge vertical.
The damper is installed on the Stale Air to Outside Collar".
5" (127 mm) Backdraft Damper (Y3728)
6" (152 mm) Backdraft Damper (Y3727)
Spring−Loaded
Backdraft
Damper
Figure 9. Direct Connection of both HRV/ERV Supply Air Stream &
Exhaust Air Stream to Furnace Cold Air Return
