Wall-Mount Unit Mounting; Mounting The Units - Bard MEGA-TEC W090A Service Instructions Manual

Mounting the Units

WARNING
!
Unit falling hazard.
Use only sufficiently rated mechanical lifting
means with proper rigging to raise the unit for
mounting.
Failure to follow this warning could result in
injury or death.
NOTE: It may be best to spot some electrical knockouts
(such as those located on the side and rear of
the wall-mount unit) before units are mounted
and access is unavailable or limited (see Figure
3 to locate pre-punched knockouts).
Heavy duty lifting lug plates are installed on each side
of the unit to allow the unit to be lifted and installed
on a structure. The plates must be removed and re-
installed in upright position (see Figure 4) for use and
can be removed after installation.
The filter access panel handle is shipped with the unit.
Attach handle to front of filter access panel using the
screws included with the handle as shown in Figure 4.
FIGURE 4
Lifting Lug Plates
Lifting Plate
(in upright position)
Filter Access
Panel Handle
3"
2" Diameter
2"
27"

WALL-MOUNT UNIT MOUNTING

Lifting Plate
(in shipping position)
MIS-3964
MIS-3964
5"
5°
2-1/4"
Two holes for the supply and return air openings must
be cut through the wall as shown in Figure 5 on page
10. 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. All walls
must be thoroughly inspected to ensure that they are
capable of carrying the weight of the installed unit.
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 full-length mounting
flanges built into the cabinet on each side which
secure the unit to the outside wall surface.
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. See Figure 5 for details on
opening sizes.
3. Locate and mark lag bolt locations and location for
optional bottom mounting bracket, if desired (see
Figure 5).
4. If desired, hook top rain flashing (attached to front-
right of supply flange for shipping) under back
bend of top.
5. Position unit in opening and secure with fasteners
sufficient for the application such as 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.
NOTE: For economizer models, mount hoods after
unit is installed so as to not block unit
flange holes.
6. Secure optional rain flashing to wall and caulk
across entire length of top (see Figure 5).
7. 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.
8. A plastic drain hose extends from each drain pan
at the top of the unit down to the unit base. There
are openings in the unit base for the drain hoses
to pass through. Additional openings exist in the
condenser fan panel section for front drainage. 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 2100-705B
Page 9 of 43