6
AIR HANDLER INSTALLATION
The B4VM-E 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 Figure 1 (page 4)
for required installation clearances. This appliance is
only for indoor use.
• 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.
Packaging Removal
Remove the shipping crate and User’s Manual from the
equipment. When removing the crate, use extra care so
tubing connectios are not damaged.
Mounting Applications
Vertical only air handlers are factory ready for upflow
applications. These units may be applied in downflow
or horizontal left and right discharge applications when
applied with the appropriate field kit.
Factory ready horizontal air handlers may be applied in
upflow or horizontal-left and -right discharge applications.
These units may also be applied in downflow discharge
when applied with the appropriate field kit as specified in
the units Technical Specifications.
Through-the-floor installations require a 1/4” thick
noncombustible resilient gasket to be used whenever the
supply or return air ducts pass through the floor. The gasket
should be positioned between the duct, unit, and floor.
Upflow Installations
All air handlers are factory shipped, ready for upflow
installation. The horizontal drain pan should be removed
from the air handler when installing the unit in an upflow
configuration. All return air must enter from the bottom of
the unit. A typical upflow unit is shown in Figure 2.
Downflow Installations
The downflow accessory kit (See Technical Specifications)
is required for downflow applications. Instructions for
installing the downflow accessory kit are included with the
kit. It is recommended that the accessory be installed prior
to installing the unit. All return air in downflow applications
must enter through the top of the unit. A typical installation
of the unit in a downflow application is shown in Figure 3.
Figure 2. Upflow Installation
Horizontal
Drain Pan
Return
Air
Figure 3. Downflow Installation
Tube
Close-off
Plate
Coil
Cabinet
Adaptor Kit
noise eminating from the air handler. These treatments
can produce a quieter installation, particularly in the
heated space. However, they can increase the pressure
drop in the duct system. Care must be taken to maintain
the proper maximum pressure differential across the
air handler, temperature rise and flow rate. This may
mean increasing the duct size and/or reducing the
blower speed. These treatments must be constructed
and installed in accordance with NFPA and SMACNA
construction standards. Consult with local codes for
special requirements. For best sound performance, be
sure to install all the needed gaskets and grommets
around penetrations into the air handler, such as for
electrical wiring.
