Broan ERV90HCS - Manual (Page 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 beside).
• Make sure the HRV/ERV 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 to building port of the HRV/ERV
(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/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.
0
!
VJ0036
B
A
VJ0035
M INIMUM 18”
(0.5 M )
A+B= N OT LESS
THAN 10’ (3.1 M )
S TEEL DUCT
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