9
2. INSTALLATION (
CONT
’
D
)
2.6
I
NSTALLING
THE
D
UCTWORK
AND
R
EGISTERS
(
CONT
'
D
)
2.6.2 C
ENTRAL
D
RAW
P
OINT
S
YSTEM
(
AS
ILLUSTRATED
IN
S
ECTIONS
1.1.2
AND
1.2.2)
Stale air exhaust ductwork:
Same as for Fully Ducted System, described on point 2.6.1
Fresh air distribution ductwork:
There are 2 methods for connecting the unit to the furnace/air handler:
Method 1: Supply side connection (All units)
• Cut an opening into the furnace supply duct at least 18 inches from the furnace/air handler.
• Connect this opening to the
Fresh air to building
port of the ERV (use
steel duct
, see
figure at right).
• Make sure the ERV duct forms an elbow inside the furnace/air handler ductwork.
• If desired, interlock (synchronize) the furnace/air handler blower operation (see Section 4).
Method 2: Return side connection (exclusively for ERV100SP unit only)
• 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 to building
port of the ERV (see figure at right).
NOTE: For Method 2, it is not essential that the furnace/air handler runs when the unit
is in operation, but we recommend it. If desired, interlock (synchronize) the
furnace/air handler blower operation (see Section 4).
WARNING
When performing duct connections, always use approved tools and materials. Respect all corresponding laws and
safety regulations. Please refer to your local building code.
!
CAUTION
When performing duct connections to the furnace supply duct, this duct must be sized to support the additional
airflow produced by the ERV. Also, use a steel duct.
VJ0112
S
TEEL
DUCT
M
INIMUM
18"
B
A
VJ0113
A+B=
NOT
LESS
THAN
10'
