User Guide

9
TRANSITIONING TO 6-IN. DUCTS
If using 6-in. ducts, install 5-in. to 6-in. transitions on the ports, and secure using duct tape only (do NOT use screws). If rigid ducting is
used, install a 12-in. section of flexible duct between the transition and the rigid ducting (see below).
RIGID DUCTS
To prevent potential water leakage in cold side rigid ducting insulation, seal all rigid ducting joints with duct tape.
To avoid transmission of vibrations, always use a 12-inch section of flexible duct to connect rigid ducts to the unit. To connect insulated
rigid ducts to the unit (cold side) using insulated flexible ducts, follow instructions in section 2.5. To connect regular rigid ducts (warm
side) to the unit using non-insulated flexible ducts, use a tie wrap.
2.6 CONNECTING THE DUCTS TO THE UNIT
INSULATED FLEXIBLE DUCTS
Use the following procedure to connect the insulated flexible ducts to the ports of the unit (exhaust to outside and fresh air from outside).
1. Expose the flexible duct by pulling back the insulation, and place it over the inner port ring.
2. Attach the flexible duct to the port using a tie wrap, making sure that the tie wrap is positioned over the foam band on the port.
3. Seal the joint using duct tape.
4. Pull the insulation and vapor barrier over the joint, tuck them between the inner and outer rings of the double collar and fasten them
in place using duct tape.
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• If ducts have to go through an unconditioned space (e.g.: attic), always use insulated ducts.
• Do not use screws to connect the ducts or transitions to the ports.
CAUTION
Avoid tearing the vapor barrier on the insulated ducts during installation to avoid condensation within the ducts.
CAUTION
2.5 INSTALLING THE EXTERIOR HOODS
Choose an appropriate location for the exterior hoods:
• At least 6 feet between both hoods to avoid cross-contamination
• At least 18 inches away from the ground
Refer to illustration at right for proper connection method of the insulated ducts to
the hoods. An “Anti-Gust Intake Hood” should be installed in regions where a lot of
snow is expected to fall.
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EXHAUST
HOOD
INTAKE
HOOD
18”
18”
6” ø
6’
6’
18”
O
PTIONAL
DUCT
LOCATION
TAPE AND DUCT TIE
CAULKING
Make sure the intake hood is at least 6 feet away from any of the
following:
• Dryer exhaust, high efficiency furnace vent,
central vacuum vent
• Gas meter exhaust, gas barbecue-grill
• Any exhaust from a combustion source
• Garbage bin and any other source of contamination.
WARNING
!
2.4 INSTALLING DUAL EXTERIOR HOOD USING TANDEM
®
TRANSITION KIT (OPTIONAL)
If desired, a Tandem transition kit can be used instead of 2 exterior hoods; but take into account this
device will generate approximately an additional 0.2 in w.g. static pressure depending on the installation.
If using the Tandem hood, we recommend to use 6-in. ducts to minimize the reduction caused by the
tandem hood restriction.
The minimum joist opening needed to install the Tandem
®
transition is 9¾”. The maximum height of the
Tandem transition is 8¾”.
To connect the insulated flexible ducts to the Tandem transition (Exhaust air to outdoors and Fresh air
from outdoors), follow the instructions included with the Tandem transition kit (part no.VTYIK1).
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