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3. INSTALLATION (
CONT
3.6 I
D
NSTALLING THE
UCTWORK AND
3.6.3 S
I
IMPLIFIED
NSTALLATION
When performing duct connections, always use approved tools and materials. Respect all corresponding laws and
safety regulations. Please refer to your local building code.
When performing duct connections to the furnace 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 blower must be in operation when the unit is in operation.
There are 2 methods for connecting the unit to the furnace/air handler:
Method 1: Supply-return connection
M
ETAL DUCT
A+B =
VJ0063
THAN
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 unit.
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.
If using Method 2, make sure the furnace/air handler blower operation is synchronized with the unit operation!
See Section 5.
NOTE: For Method 1, it is not essential to synchronize the furnace blower operation with the unit operation, but we recommend it.
'
)
D
R
(
'
)
EGISTERS
CONT
D
(
S
AS ILLUSTRATED IN
ECTION
M
18"
INIMUM
(0.5
)
M
B
A
NOT LESS
10' (3.1
)
M
2.3)
!
WARNING
CAUTION
VJ0064
CAUTION
9
Method 2: Return-return
A
M
3'
INIMUM
(0.9
)
M
B
A+B =
NOT LESS
10' (3.1
)
THAN
M
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