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7
3.2 Combining with an AHU
3.2.1 Recommended con gurations
When the distribution of fresh air from the ERV is connected to the return of an AHU (such as in the image below, on the left),
the connection should be done as close as possible from one AHU return grille to ensure proper functionning of the built-in
fresh air damper.
ERV
AHU
Stale air
to outdoors
with backdraft
damper
Return grille
of AHU
Fresh air
from outdoors
Stale air
from home
VH0114A
Return grille
of AHU
Distribution of
fresh air in AHU
Stale air
from home
ERV
Fresh air
from outdoors
Stale air
to outdoors
with backdraft
damper
AHU supply ducting
and grille to home
AHU
VH0112A
Stale air from home
connected to return
ducting of AHU
Distribution
of fresh air
using plastic grille
AHU
AHU supply ducting
and grille to home
Stale air
to outdoors
with backdraft
damper
Fresh air
from outdoors
VH0113A
ERV
OPTION 2OPTION 1
3 Installation (cont'd)
ERV
VH0115A
AHU supply ducting
and grille to home
Stale air from home
connected to return
ducting of AHU
Distribution
of fresh air
connected to return
ducting of AHU
Stale air
to outdoors
with backdraft
damper
Fresh air
from outdoors
3.2.2 Prohibited con gurations
Distribution of fresh air from the ERV in the distribution ducting from the AHU (such as in the image below, on the left) may
cause condensation issues during cooling season and must be avoided.
Connecting both distribution of fresh air from the ERV and stale air exhaust in the AHU return ducting (such as in the image
below, on the right) must be avoided.
VJ0162
OPTION 1 - If AHU return duct static
pressure exceeds the -0.15 in w.g.
threshold during AHU operation, indirect
connection combined with a supplemental
return grille or "T" connection with the
conditioned space shall be used to ensure
proper functioning of the built-in fresh air
damper.
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