3.5 I
NSTALLING THE
D
UCTWORK AND
R
EGISTERS
(
CONT
’
D
)
3.5.3 S
IMPLIFIED
I
NSTALLATION
(
AS ILLUSTRATED IN
S
ECTION
2.3) (
CONT
’
D
)
Fresh air distribution
• Same instructions as for Method 1 or Method 2, Section 2.7.2.
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.
3. INSTALLATION
(CONT’D)
- 8 -
CAUTION
If using Method 2, make sure the furnace/air handler blower operation is synchronized with the unit operation! See Section 5.
Rigid ducts
Use duct tape to connect the rigid ducts to the unit ports.
Make sure both balancing dampers are left in a fully open position before connecting the ducts to these ports (
Fresh air to building
port
and
Exhaust air from building port
) as shown below.
3.6 C
ONNECTING THE
D
UCTS TO THE
U
NIT
Insulated flexible ducts
Use the following procedure for connecting the insulated flexible ducts to the ports of the unit (
Exhaust air to outside
and
Fresh air
from outside
ports).
CAUTION
Make sure the vapor
barrier on the insulat-
ed ducts does not tear
during installation to
avoid condensation
within the ducts.
CAUTION
Do not use screws to connect the rigid ducts to the unit ports.
VJ0002
VJ0004
VJ0005
VJ0001
Pull back the insulation
to expose the flexible
duct.
Attach the flexible duct to
the port using tie wrap.
Pull the vapor barrier
over the insulation and
over the outer ring of the
double collar.
Apply duct tape to the
joint making an airtight
seal. Avoid compressing
the insulation when
pulling the tape tightly
around the joint.
Compressed insulation
loses its R value and
causes water dripping
due to condensation on
the exterior surface of
the duct.
VJ000
3
Pull the insulation over
the joint and tuck in
between the inner and
outer rings of the double
collar.
VJ0011
