Wall-Mount Unit Installation; Mounting The Unit; Outdoor Sensor Installation - Bard W18AAPA Installation Instructions Manual

WALL-MOUNT UNIT INSTALLATION

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 2 to locate pre-
punched knockouts).
Two holes for the supply and return air openings must
be cut through the wall as shown in Figures 4A-D on
pages 9-12. 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. All
walls must be thoroughly inspected to insure 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 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.
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 Figures
4A-D for details on opening sizes.
3. Locate and mark lag bolt locations and location for
optional bottom mounting bracket, if desired (see
Figures 4A-D).
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.
Manual 2100-678
Page 8 of 24
6. 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.
7. Secure optional rain flashing to wall and caulk
across entire length of top (see Figures 4A-D).
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.
10. Install outdoor temperature/humidity sensor (see
Figure 3). Remove grommet from base and sensor.
Discard shipping bracket. Place sensor extension
through hole in base under condenser fan and
secure to base with screw.
FIGURE 3

Outdoor Sensor Installation