9
T
ransiTioninG
To
6-
in
.
ducTs
(
for
110, 130
and
150
cfm
uniTs
onlY
)
If using 6-in. ducts, install 5-in. to 6-in. transitions on the ports, and secure using duct tape only. If rigid ducting is used, install a 12-in.
section of flexible duct between the transition and the rigid ducting (see above).
r
iGid
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 c
onnecting
the
D
ucts
to
the
u
nit
i
nsulaTed
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.
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.
VJ0157
•
If ducts have to go through an unconditioned space (e.g.: attic), always use insulated ducts to prevent condensation formation inside
and outside ducts, which could cause material damage and/or mold growth.
•
Do not use screws to connect the ducts or transitions to the ports so as not to interfere with ports inner dampers operation. A
non-functioning damper could freeze the unit, which could cause damages.
CAUTION
The vapor barrier should remain intact and free of cracks or openings. An opening could produce condensation inside or outside duct,
which could cause material damage and/or mold growth in the long run.
CAUTION
2.5 i
nstAlling
the
e
xterior
h
ooDs
To avoid cross-contamination:
• Keep at least 10 feet between both hoods OR use approved combined hoods
model VTYIK1.
• Install hood(s) at least at 18 inches away from the ground OR depth of expected
snow accumulation, whichever is greater.
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.
VD0028
e
xhausT
h
ood
i
nTake
h
ood
18
”
18
”
6
” ø
10
’
6
’
18
”
o
pTional
ducT
locaTion
T
ape
and
ducT
Tie
c
aulkinG
Make sure intake hood is at least 6 feet (1.8 m) away from any of the following:
• Dryer exhaust, high efficiency central forced-air system vent, central vacuum
vent
• Gas meter exhaust, gas barbecue-grill
• Any exhaust from a combustion source
• Garbage bin and any other source of contamination.
Ignoring these recommendations could significantly degrade the quality of the
incoming air which, in some cases, could result in health consequences.
In the event of a conflict between our conditions and local requirements, the
latter will have priority.
WARNING
!
NOTE: It is recommended to use 6
"
ducting instead of 5
"
ducting for 150H75NT, 150H75NS, 150E75NT and 150E75NS units if
required airflow is over 130 CFM. It will prevent having too high static pressure in the ducting.
