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air duct opening or filter rack located in the bottom of the
unit. Accessing the filter does not require tools and can
be removed from the front of the unit by removing the filter
door. See Unit Maintenance (page 13) for filter sizes and
installation information.
WARNING:
Never operate the air handler without a filter
or with doors removed. Dust and lint can build
up on internal components, resulting in loss of
efficiency, equipment damage, and possible fire.
AIR HANDLER INStALLAtIoN
These Installation procedures are suggested for typical
air handler installations. Since all installations are different
from each other, the sequence of these steps may
differ from the actual installation. only qualified HVAc
technicians should install this furnace.
The B6BV series air handler is shipped ready for vertical
upflow installation and is approved for attic, basement,
alcove/closet or crawlspace installation with zero clearance
to combustibles. See Table 1 (page 4) for required
installation clearances. this appliance is approved only
for indoor use.
• Remove the shipping crate and User's Manual from the
equipment.
• The unit must be leveled at installation and attached to
a properly installed duct system.
• The surface that the air handler is mounted on must
provide sound physical support of the unit.
• The air handler must be installed so that all electrical
components are protected from water.
• If a louvered door is installed across the front of this
unit, the appliance must be mounted flush or behind
front edge of finished wall.
upflow Installations
All air handlers are factory shipped, ready for upflow
installation. All return air must enter from the bottom of the
unit when installed in the upflow configuration. A typical
upflow unit is shown in Figure 1.
Position the air handler on top of the return air duct and
secure together with sheet metal screws. The screws must
penetrate the sheet metal cabinet and duct. Tape or seal
all seams if required by local code.
To attach the supply air duct to the air handler, bend the
perforated flanges (Figure 3, page 7) upward 90° with a
pair of wide duct pliers. Position the duct on top of the
air handler and secure together with sheet metal screws.
Make sure the screws penetrate the sheet metal casing and
flanges. Tape or seal all seams if required by local code.
NotE: If an upflow pedestal mounting stand is fabricated
in the field, the stand must be constructed strong
enough to support the unit with all accessories installed
6
UPFLOW
Return
Air
Figure 1. Installation configurations
(approximately 130 lbs. for B-cabinet models and 200 lbs.
for C-cabinet models). The construction of the pedestal
stand must also allow for at least 235 in
2
(300 in
for C-cabinet models) in the application. Field
fabricated upflow pedestal mounting stands must be
constructed of noncombustible materials. Position the air
handler on top of the mounting stand and secure together
with sheet metal screws. The screws must penetrate the
sheet metal cabinet and duct. Tape or seal all seams if
required by local code.
Downflow Installations
B6BV air handlers can be converted to downflow operation
by flipping an upflow unit 180°. A typical installation of
the unit in a downflow application is shown in Figure 1.
NotE: Downflow installations require the use of a plenum
connector (or its equivalent) if the supply air ducts pass
through the floor of the structure. This factory supplied
accessory must be installed in the floor cavity and attached
to the supply air duct before the downflow unit is installed.
Available plenum connectors for all B6BV air Handlers
are listed in Table 2 (page 7). All return air in downflow
applications must enter through the top of the unit.
Position the air handler on top of the plenum connector and
secure together with sheet metal screws. The screws must
penetrate the sheet metal cabinet and plenum connector.
Tape or seal all seams if required by local code.
Plenum Connector Installation
The plenum connector is designed for use with trunk ducts
having a minimum width of 12". If sufficient space is not
available to adequately bend and secure duct tabs it may
be necessary to attach the connector to the duct using
Return
Air
DOWNFLOW
2
free opening
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