Broan ERV70S Guia De Instalacion página 7

4. I
( '
NSTALLATION
CONT
4.4 I D
NSTALLING THE UCTWORK AND
4.4.2 C D
ENTRAL RAW
Stale air exhaust ductwork
Same as for Fully Ducted System, described on point 4.4.1
When performing duct connections, always use approved tools and materials. Respect all corresponding
laws and safety regulations. Please refer to your local building code.
When performing duct connections to the furnace supply duct, this duct must be sized to support the
additional airflow produced by the unit. Also, the use of metal duct is highly recommended.
Fresh air distribution ductwork
There are 2 methods for connecting the unit to the furnace/air handler:
Method 1: Supply side connection
• Cut an opening into the furnace supply duct at least 18 inches from the
furnace/air handler.
• Connect this opening to the Fresh air distribution port of the unit (use metal
duct, see figure at right).
• Make sure the unit duct forms an elbow inside the furnace/air handler ductwork.
• If desired, interlock (synchronize) the furnace/air handler blower operation (see
Section 6 Electrical Connection to the Furnace).
Method 2: Return side connection
• Cut an opening into the furnace return duct not less than 10 feet from the
furnace/air handler (A+B).
• Connect this opening to the Fresh air distribution port of the unit (see figure
at right).
NOTE: For Method 2, it is not essential that the furnace/air handler runs when the
unit is operation, but we recommend it. If desired, interlock (synchronize)
the furnace/air handler blower operation (see Section 6 Electrical
Connection to the Furnace).
)
D
R
(
EGISTERS
CONT
P ( S
OINT AS ILLUSTRATED IN
' )
D
3.2)
ECTION
!
WARNING
CAUTION
7
M
ETAL DUCT
VJ0075
A+B =
THAN
VJ0076
M 18"
INIMUM
A
B
NOT LESS
10'