Installation manual

Simplified Installation Diagrams (120ERV)
A Backdraft Damper is required in the Stale
Air to Outside air duct to prevent outdoor air
from entering the ERV when the
Furnace/Airhandler is operating and the ERV
is in either Standby or OFF.
Air
Handler
*Unit is normally balanced on
HIGH speed with air handler
b
lower ON.
Return Air
3' (915 mm)
MINIMUM
recommended
40" (1m) MINIMUM
High efficiency filter
or electronic air cleaner
Exhaust Air
to Outside
Fresh Air
from Outside
Damper for
balancing airflow
Install backdraft
damper to ERV
collar with leaf hinge
vertical
Damper for
balancing airflow
Key Points
• The ERV must be balanced.
•
It is mandatory that the furnace blower run
continuosly or ERV operation be interlocked
with the furnace blower.
• The duct configuration may change depending on
the ERV 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/Airhandler is
r
unning and the unit is in either Standby or OFF.
S
izing the Ductwork
T
he installer must ensure that all duct work is
sized and installed as designed to ensure the
system will perform as intended.
The amount of air (cfm) that an 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
n
umber of fittings used in the duct work.
Installation Notes
• Unit is normally balanced on HIGH speed with the furnace blower ON.
• A minimum separation of 40 inches (1m) is recommended between the
two direct connections.
• The exhaust air connection should be upstream of the supply air
connection to prevent exhausting fresh air.
• Weatherhood arrangement is for drawing purposes only. Six feet (2m)
minimum separation is recommended. The Weatherhood must also be
a minimum of 18” (460 mm) above grade.
• The airflow must be confirmed on site using the balancing procedures
explained in this manual.
Spring-Loaded Backdraft Damper (Not Included)
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 No. 99-RSK5
WARNING
15