Wall-Mount Unit Installation - Bard D36A2P/BLD.10304 Installation And Service Instructions Manual

MOUNTING THE UNITS
WARNING
!
Heavy item hazard.
Use more than one person to handle unit.
Failure to do so could result in unit damage or
serious injury.
NOTE: It may be best to spot some electrical knockouts
(such as those located on the back of the wall-
mount unit) before units are mounted and access is
unavailable or limited (see Figure 1.2 to locate pre-
punched knockouts).
Two holes for the supply and return air openings must
be cut through the wall as shown in Figure 1.3 on page
12. On wood frame walls, the wall construction must
be strong and rigid enough to carry the weight of the
unit without transmitting any unit vibration. Concrete
block walls must be thoroughly inspected to insure that
they are capable of carrying the weight of the installed
unit.
NOTICE
AT&T National Standards forbids the use of
any adaptor or transitional curbs for use in
the installation of wall-mount HVAC systems.
If existing supply and return penetrations
do not match new requirements, those
openings must be modified to meet the
needs of the new equipment.
In retrofit (unit replacement) installations, the openings
cut for the original equipment may not line up exactly
with needs of this installation. Modifications may need
to be made, such as increasing or decreasing the size
of the wall cutouts. The existing bolt placement may
not line up in which case the original bolts would need
to be removed or cut away.
1. These units are secured by wall mounting flanges
which secure the unit to the outside wall surface at
both sides. A bottom mounting bracket, attached
to skid for shipping, is provided for ease of
installation, but is not required.

WALL-MOUNT UNIT INSTALLATION

2. The unit itself is suitable for 0" clearance, but the
supply air duct flange and the first 3' of supply
air duct require a minimum of 1/4" clearance to
combustible material. However, it is generally
recommended that a 1" clearance is used for
ease of installation and maintaining the required
clearance to combustible material. See Figure 1.3
for details on opening sizes.
3. Locate and mark lag bolt locations and location for
optional bottom mounting bracket, if desired (see
Figure 1.3).
4. Mount bottom mounting bracket (if used).
5. If desired, hook top rain flashing (attached to front-
right of supply flange for shipping) under back
bend of top.
6. Position unit in opening and secure with 5/16" lag/
anchor/carriage bolts; use 7/8" diameter flat washers
on the lag bolts. It is recommended that a bead
of silicone caulking be placed behind the side
mounting flanges.
7. Secure optional rain flashing to wall and caulk
across entire length of top (see Figure 1.3).
8. For additional mounting rigidity, the return air
and supply air frames or collars can be drilled
and screwed or welded to the structural wall itself
(depending upon wall construction). Be sure to
observe required clearance if combustible wall.
9. A plastic drain hose extends from the drain pan at
the top of the unit down to the unit base. There are
openings in the unit base for the drain hose to pass
through. In the event the drain hose is connected
to a drain system of some type, it must be an open
or vented type system to assure proper drainage.
Manual 2100-620A
Page 11 of 107