Bard WA421 Manuale Utente

Manual   2100-218
Page    7

Failure to provide the 1/4 inch clearance
between the supply duct and a combustible
surface for the first 3 feet of duct can result in
fire causing damage, injury or death.

1. Two holes for the supply and return air openings must

be cut through the wall as shown in Figure 3.

2. 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.

3. Concrete block walls must be thoroughly inspected to

insure that they are capable of carrying the weight of
the installed unit.

1. These units are secured by wall mounting brackets

which secure the unit to the outside wall surface at
both sides.  A bottom mounting bracket is provided
for ease of installation, but is not required.

2. The unit itself is suitable for 0 inch clearance, but the

supply air duct flange and the first 3 feet of supply air
duct require a minimum of 1/4 inch clearance to
combustible material.  If a combustible wall use a
minimum of 30-1/2” x 10-1/2” dimensions for sizing.
However it is generally recommended that a 1 inch
clearance is used for ease of installation and
maintaining the required clearance to combustible
material.  The supply air opening would then be 32” x
12”.  See Figures 3 and 4 for details.

3. Locate and mark lag bolt locations and bottom

mounting bracket location.  See Figure 3.

4. Mount bottom mounting bracket.

5. Hook top rain flashing under back bend of top.  Top

rain flashing is shipped secured to the right side of the
back.

6. Position unit in opening and secure with 5/16 lag

bolts; use 7/8 inch diameter flat washers on the lag
bolts.

7. Secure rain flashing to wall and caulk across entire

length of top.  See Figure 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. On side by side installations, maintain a minimum of

20 inches clearance on right side to allow access to
control panel and heat strips, and to allow proper
airflow to the outdoor coil. Additional clearance may
be required to meet local or national codes.