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7
2.2.3 SIMPLIFIED INSTALLATION (T-4) (THIS CONFIGURATION DOES NOT ALLOW RECIRCULATION MODE TO OPERATE.)
The central forced-air system must be synchronized with the unit since fresh air evacuation and distribution
come from the same section. The central forced-air system must operate to avoid fresh air to be directly
drawn by the evacuation, which would reduce signifi cantly fresh air supply to the building. See Section 3.3
for ducting.
CAUTION
Duct connection to the central forced-air system can be regulated by some codes and standards. It is your
responsibility to consider and comply with your local requirements to avoid any non-compliance.
WARNING
!
VH0168
Fresh air and exhaust air fl ow through the central forced-air
system ducts, which simplifi es the installation.
The use of bathroom fans and a range hood is suggested to
exhaust stale air.
STALE AIR FROM BUILDING:
Connect the stale air intake port of the unit to the central forced-
air system return duct at least 3 feet ahead of the fresh air
distribution from the unit.
FRESH AIR TO BUILDING:
Connect the fresh air distribution duct of the unit to the central
forced-air system return duct at least 10 feet away from the
central forced-air system (A+B)*.
* This 10-ft. distance applies only in areas where the outside
temperature falls below the freezing point 0°C (32°F).
VH0167
C
B
A
A+B= MIN 10’
C=3’
ALTERNATE INSTALLATION (T-5) (THIS CONFIGURATION DOES NOT ALLOW
RECIRCULATION MODE TO OPERATE.)
Unit should be synchronized with central forced-air system
operation to avoid condensation and mold growth in central
forced-air system distribution ducting if cooling mode of central
forced-air system is used.
Fresh air
to building
Stale air from
building
Stale air to
outdoors
Fresh air from
outdoors
This confi guration is not recommended with high velocity
central forced-air system. High pressures produced by
these systems could affect unit proper operation and
generate errors.
CAUTION
NOTE: For this type of confi guration, the T-5 option must be
selected on the LCD screen when auto-balancing the unit.
Stale air to
outdoors
Fresh air from
outdoors
Fresh air to
building
Stale air from
building
NOTE: For this type of confi guration, the T-4 option must be
selected on the LCD screen when auto-balancing the unit.
VH0166
ALTERNATE INSTALLATION (T-3) (THIS CONFIGURATION ALLOWS RECIRCULATION
MODE TO OPERATE.)
Unit should be synchronized with central forced-air system
operation to avoid condensation and mold growth in central forced-
air system distribution ducting if cooling mode of central forced-air
system is used.
This confi guration is not recommended with high velocity
central forced-air system. High pressures produced by these
systems could affect unit proper operation and generate
errors.
CAUTION
NOTE: For this type of confi guration, the T-3 option must be
selected on the LCD screen when auto-balancing the unit.
Stale air from
bathroom
Fresh air to
building
Stale air to
outdoors
Fresh air from
outdoors
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