Broan ERV140 ECM, Руководство по установке

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8
2. INSTALLATION (
CONT
'
D
)
2.6 I
NSTALLING THE
D
UCTWORK AND
R
EGISTERS
(
CONT
’
D
)
2.6.3 S
IMPLIFIED
I
NSTALLATION
Method 3: Supply-return connection
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/AHU supply
duct (Method 1), this duct must be sized to support the
additional airflow produced by the unit. Also, the use of metal
duct is highly recommended. For a Return-Return installation,
the furnace/AHU blower must be in operation when the unit is
in operation. See Section 4.
VJ0063
A
B
M
ETAL DUCT
A+B =
NOT LESS
THAN
10’
M
INIMUM
18"
B
A
VJ0064
M
INIMUM
3'
A+B =
NOT LESS
THAN
10’
Stale air intake
• Cut an opening into the furnace/air handler return duct not less than 10 feet from the
furnace/air handler (A+B)*.
* This 10-ft. distance applies only in areas where the outside temperature falls below the
freezing point (32°F).
• Connect this opening to the Exhaust air from building port of the unit.
Fresh air distribution
• Cut an opening into the furnace/air handler supply duct at least 18 inches from the
furnace/air handler.
• Connect this opening to the Fresh air distribution port of the unit (use metal duct ,
see figure at right).
• Make sure the unit duct forms an elbow inside the furnace/air handler ductwork.
NOTE: If it is impossible to make an elbow inside the furnace/air handler supply ductwork, a backdraft damper must be installed
to prevent damages to the ventilation unit.
NOTE: For Method 3, it is not essential to synchronize the furnace/AHU blower operation with the unit operation, but we recommend it.
VH0073
Method 4: Return-return connection
Stale air intake
• Cut an opening into the furnace/air handler return duct at least
3 feet ahead of the fresh air distribution duct connection.
• Connect this opening to the Exhaust air from building port of the
unit.
Fresh air distribution
• Cut an opening into the furnace/air handler return duct not less
than 10 feet from the furnace/air handler (A+B)*.
* This 10-ft. distance applies only in areas where the outside temperature
falls below the freezing point (32°F).
• Connect this opening to the Fresh air distribution port of the unit.