Manual 2100-715B
Page
8 of 25
Wall Preparation
1. Two holes for the supply and return air openings
must be cut through the wall as shown in Figure 3
on page 10. Be sure the openings are square and
level. Follow all clearances including distances
to combustible materials and all instructions
provided in this manual.
2. Review all electrical requirements provided in this
manual and plan out electrical entrances into the
building. Also plan electrical conduit routing and
thermostat placement, if necessary.
3. Install necessary duct work and prepare the
openings for unit installation.
4. Clean the exterior wall where the unit is to be
installed and make sure it is able to provide a
smooth, level, debris-free surface. Remove all
construction debris from the supply, return and
electrical hole cutting process.
Wall Mount Installation to Wall Surface
1. Remove packaging from unit and make sure the
unit is not damaged before installation. A top rain
flashing is supplied for field use and is mounted to
the back of the unit for shipping. Remove the rain
flashing before locating the unit against the wall.
Top rain flashing is required to avoid water entering
the area behind the unit that is against the wall.
Review all requirements listed on unit labels and
on serial plate located on the side of the unit.
2. Position the wall mount unit close to the wall
surface where it will be installed. Install rain
flashing at the top of the unit facing the wall by
hooking the hem bend into the rear bend of the
unit top (see Figure 3).
3. Apply a liberal amount of caulk on left and right
cabinet side wall mount brackets and back of
top rain flashing. Place unit back surface flush
against wall. Unit must be level to ensure proper
condensate drainage.
4. Units are secured to the wall by using field-
supplied fasteners along each side of the wall
mount through the built-in wall mounting brackets.
It is the responsibility of the installer to select
the proper fastener to secure the unit to the wall
based on wall construction and applicable building
codes. Typical installations may include 5/16"
fasteners with 7/8" diameter flat washers. Be sure
unit is securely mounted and all weight-bearing
fasteners are attached to the weight supporting
structural members of the wall.
5. Apply a bead of caulk between the back of the unit
top and the front surface of the top rain flashing
(see Figure 3).
TABLE 1
Clearance Required for Service Access and
Adequate Condenser Airflow
Model
Left
Side
Right
Side
Discharge –
Front
W12AB
15"
20"
10'
6. Connect unit duct work from the inside of the
building following all clearances and instructions
provided. 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 use code approved duct tape or other sealing
materials to seal the duct work to the unit.
7. On side-by-side installations, maintain a minimum
of 20" clearance on right side to allow access
to control panel and allow proper airflow to the
outdoor coil. Additional clearance may be required
to meet local or national codes.
