3.5 I
NSTALLING THE
D
UCTWORK AND
R
EGISTERS
(
CONT
’
D
)
3.5.2 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 3.5.1)
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 distribution
port of the HRV (use
steel
duct
, see figure beside).
• Make sure the HRV duct form 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 distribution
port of the HRV
(see figure beside).
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 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. Also, use a steel duct.
0
!
VD0172
B
A
VD010
8
MINIMUM
18”
(0.5
M
)
A+B=
NOT LESS
THAN
10’ (3.1
M
)
STEEL DUCT
- 7 -
3. INSTALLATION
(CONT’D)
3.5.3 S
IMPLIFIED
I
NSTALLATION
(
AS ILLUSTRATED IN
S
ECTION
2.3)
There are 2 methods for connecting the unit to the furnace/air handler:
Method 1: Supply-return connection
Method 2: Return-retur
Stale air intake
• Cut an opening into the furnace/air handler return duct not less than 10 feet (3.1 m) from the furnace/air handler (A+B).
• Connect this opening to the
Exhaust air from building
port of the HRV.
WARNING
When performing duct connections, always use approved tools and materials. Respect all corresponding laws and/or safety
regulations. Please refer to your local building code.
CAUTION
When performing duct connections to the furnace supply duct (Method 1), this duct must be sized to support the additional
airflow produced by the HRV. Also, use a steel duct. For a Return-Return installation, the furnace blower must be in operation
when the HRV is in operation.
0
!
B
A
VD0171
A+B=
NOT LESS
THAN
10’ (3.1
M
)
MINIMUM
18”
(0.5
M
)
STEEL DUCT
B
A
VD0111
A+B=
NOT LESS
THAN
10’ (3.1
M
)
MINIMUM
3’
(0.9
M
)
