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1111
For the Installer
5.3.5 SimPliFieD inStallation - RetuRn/RetuRn
Fresh air to building ductwork:
• Cut an opening into the furnace return duct at least 10 feet (3 m) away from the
furnace.
• Connect this opening to the fresh air to building port of the unit (use metal ducts,
see illustration at right).
Stale air from building ductwork:
• Cut an opening into the furnace return at least 3 feet (1 m) ahead of the fresh air
to building ductwork connection to the furnace return.
• Connect this opening to the stale air from building port of the unit.
• Make sure that both connections to the furnace return duct are at least 3feet
(1m) apart.
CAUTION
For this type of installation, the furnace must always be synchronized
with the unit. See section 7.
5.4 connecting tHe DuctS to tHe unit
CAUTION
• If ducts have to go through an unconditioned space (e.g.: attic), always use insulated ducts.
• Make sure the vapor barrier on the insulated ducts does not tear during installation to avoid condensation
within the ducts.
• Always use insulated ducts to connect the Fresh air from outdoors and Stale air to outdoors ports with the
exterior hood(s).
5.4.1 inSulateD FlexiBle DuctS
1. Pull back the insulation to expose the flexible 6 in. round duct.
2. Attach the flexible duct to the port using tie wrap.
3. Pull the insulation over the joint and tuck in between the inner and outer rings of the double collar without compressing it to minimize
possible condensation buildup within the duct, as well as minimize building heat loss and gain.
4. Pull down the vapor barrier (shaded part in illustrations below) over the outer ring to cover it completely. Fasten in place the vapor
barrier using the port strap (included in unit parts bag). To do so, insert one collar pin through the vapor barrier and first strap hole,
then insert the other collar pin through the vapor barrier and center strap hole and close the loop by inserting the first collar pin in the
last strap hole to create an air-tight path and to minimize building heat loss and gain and reduce the potential for condensation.
5.4.2 non-inSulateD FlexiBle DuctS
Use tie wraps to perform connections, then seal with duct tape.
5.4.3 non-inSulateD RigiD DuctS
To avoid transmission of vibrations, always use a 6-inch section of flexible duct to connect rigid ducts to the unit. Use tie wraps to
perform connections, then seal with duct tape.
Make sure to replace insulation around any openings made in the building envelope when installing unit or
ducting. Seal insulation with tape or caulk to minimize building heat loss and gain and to reduce the potential for
condensation.
CAUTION
COLLAR PINS
STRAP
VJ0132
VH0160
B
A
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