Installation, Cont’d) caution, Warning – Broan HRV90H User Manual
Page 12: Caution, Ab c
3.6 I
NSTALLING THE
D
UCTWORK AND
R
EGISTERS
(
CONT
’
D
)
3.6.3 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 2A: Return-return without
Method 2B: Return-return with
Automatic fresh air bypass
Automatic fresh air bypass
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/ERV.
Fresh air distribution
• Same instructions as for Method 1 or Method 2, Section 3.6.2.
For Method 2 (Return-return), make sure there is a distance of at least 3 feet (0.9 m) between the 2 connections to the furnace/air
handler.
NOTE: For Method 1, it is not essential to synchronize the furnace blower operation with the unit operation, but we recommend it.
3. INSTALLATION
(CONT’D)
CAUTION
If using Method 2, unless the optional Automatic fresh air bypass (part #15391) is installed, make sure the furnace/air handler
blower operation is synchronized with the unit operation! See Section 5.
- 12 -
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, unless using the optional Automatic fresh air bypass
(part #15391), this duct must be sized to support the additional airflow produced by the HRV/ERV. Also, use a steel duct. For a
Return-Return installation, installing the optional Automatic fresh air bypass (part #15391) eliminates the obligation to operate
the furnace blower when the HRV/ERV is in operation.
0
!
B
A
VJ0037
A+B=
NOT LESS
THAN
10’ (3.1
M
)
MINIMUM
18”
(0.5
M
)
STEEL DUCT
B
A
VJ0038
A+B=
NOT LESS
THAN
10’ (3.1
M
)
MINIMUM
3’
(0.9
M
)
VJ0034
A
B
C
D
ISTANCE
A:
MINIMUM
3’ (0.9
M
)
B+C=
NOT LESS THAN
10’ (3.1
M
)
A
UTOMATIC FRESH
AIR BYPASS