9
3. INSTALLATION
(
CONT
’
D
)
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 2: Return-return
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 (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.
VJ0063
A
B
M
ETAL
DUCT
A+B =
NOT
LESS
THAN
10’ (3.1
M
)
M
INIMUM
18"
(0.5
M
)
B
A
VJ0064
M
INIMUM
3'
(0.9
M
)
A+B =
NOT
LESS
THAN
10’ (3.1
M
)
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.
NOTE: For Method 1, it is not essential to synchronize the furnace blower operation with the unit operation, but we recommend it.
CAUTION
If using Method 2, make sure the furnace/air handler blower operation is synchronized with the unit operation!
See Section 5.
