Combining With An Ahu - Broan SKY Series Installation And User Manual

3 Installation

3.2 Combining with an AHU

3.2.1 Recommended configurations
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.
o 1
ption
Return grille
of AHU
Distribution of
fresh air in AHU
ERV
Stale air from home
(flexible duct
Stale air
4 ft minimum length)
to outdoors
with backdraft
damper
from outdoors
VH0112A
VJ0162A
3.2.2 Prohibited configurations
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.
Return grille
of AHU
ERV
Stale air
to outdoors
with backdraft
damper
VH0114A
(cont'd)
AHU supply ducting
and grille to home
Fresh air
Stale air
from home
Fresh air
from outdoors
o 2
ption
Distribution
of fresh air
using plastic grille
Stale air
to outdoors
with backdraft
damper
ERV
Fresh air
from outdoors
VH0113A
o 1 - If AHU return duct static
ption
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.
Distribution
of fresh air
connected to return
ducting of AHU
Stale air
to outdoors
with backdraft
damper
VH0115A
7
Stale air from home
connected to return
ducting of AHU
AHU supply ducting
and grille to home
o
ption
Unit can be installed on a fully
ducted system (not shown)
ERV
Stale air from home
connected to return
ducting of AHU
AHU supply ducting
and grille to home
Fresh air
from outdoors
3