11
3. INSTALLATION
(
CONT
’
D
)
3.6 I
NSTALLING
THE
D
UCTWORK
AND
R
EGISTERS
(
CONT
’
D
)
3.6.2
C
ENTRAL
D
RAW
P
OINT
S
YSTEM
(
AS
ILLUSTRATED
IN
S
ECTION
2.2)
Stale air exhaust ductwork:
Same as for Fully Ducted System, described on point 3.6.1
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 (0.5 m) from the
furnace/air handler.
• Connect this opening to the
Fresh air to building
port of the HRV/ERV (use
steel
duct
, see figure at right).
• Make sure the HRV/ERV duct forms an elbow inside the furnace/air handler ductwork.
• If desired, interlock (synchronize) the furnace/air handler blower operation (see
Section 5).
Method 2: Return side connection
• Cut an opening into the furnace return duct not less than 10 feet (3.1 m) from the
furnace/air handler (A+B).
• Connect this opening to the
Fresh air to building
port of the HRV/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 5).
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 HRV/ERV. Also, use a steel duct. It is recommended that the HRV/ERV is running when the furnace is in
operation to prevent backdrafting inside HRV/ERV.
VJ0036
S
TEEL
DUCT
M
INIMUM
18"
(0.5
M
)
B
A
VJ0035
A+B=
NOT
LESS
THAN
10' (3.1
M
)
