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9
For the Installer
6.2.3 CENTRAL DRAW POINT SYSTEM - RETURN SIDE
Stale air exhaust ductwork
• Same as for fully ducted system (see section 6.2.1)
Fresh air distribution ductwork
• Cut an opening into the furnace return duct not less than 10 feet (3.1 m) away
from the furnace/air handler (A+B)
• Connect this opening to the Fresh air distribution port of the unit (see figure
beside)
NOTE: For this type of installation, it is recommended, however not essential,
that the furnace blower be synchronized with the unit.
VH0127
B
A
A + B = AT LEAST
10’ (3.1 M)
6.2.4 SIMPLIFIED INSTALLATION - SUPPLY/RETURN
Stale air intake
• Cut an opening into the furnace return duct not less than 10 feet (3.1 m) away from
the furnace/air handler (A+B).
• Connect this opening to the Exhaust air from building port of the unit.
Fresh air distribution ductwork
• Cut an opening into the furnace supply duct at least 18 inches (0.5 m) away from
the furnace/air handler
• Connect this opening to the Fresh air distribution port of the unit (use a metal
duct, see figure aside)
• Make sure the unit duct forms an elbow inside the furnace/air handler ductwork.
NOTE: For this type of installation, it is recommended, however not essential, that the
furnace blower be synchronized with the unit.
When performing duct connections to the furnace supply duct, use
metal ducts appropriately sized to support the additional airflow
produced by the unit.
CAUTION
VH0129
A
B
A + B = AT LEAST
10’ (3.1 M)
18” (0.5 M)
MINIMUM
6.2.5 SIMPLIFIED INSTALLATION - RETURN/RETURN
Stale air intake
• Cut an opening into the furnace return duct not less than 10 feet (3.1 m) away from
the furnace/air handler (A+B).
• Connect this opening to the Exhaust air from building port of the unit.
Fresh air distribution ductwork
• Cut an opening into the furnace return duct at least 18 inches (0.5 m) away from
the furnace/air handler
• Connect this opening to the Fresh air distribution port of the unit (use a metal
duct, see figure aside)
• Make sure the unit duct forms an elbow inside the furnace/air handler ductwork.
• Make sure that both connections to the furnace return duct are at least 3 feet (1 m) apart (C).
VH0128
C
A
B
A + B = AT LEAST
10’ (3.1 M)
C = AT LEAST
3’ (1 M)
For this type of installation, the furnace must always be synchronized
with the unit. See section 6.
CAUTION
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