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INSTALLATION INSTRUCTIONS
WARNING
Failure to bolt the unit to the wall could result
in the unit falling, causing injury or death!
Follow all mounting instructions.
WALL MOUNTING INFORMATION
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 ensure that they are capable of carrying the
weight of the installed unit.
MOUNTING THE 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, attached
to skid for shipping, 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. However, it is
generally recommended that a 1-inch clearance is
used for ease of installation and maintaining the
required clearance to combustible material. See
Figure 3 for details on opening sizes.
3. Locate and mark lag bolt locations and bottom
mounting bracket location. See Figures 3A & 3B.
4. Mount bottom mounting bracket.
5. 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 bolts;
use 7/8 inch diameter flat washers on the lag bolts.
Clearances Required for Service Access
and Adequate Condenser Airflow
MODELS
C24H, C30H
C36H, C42H, C48H, C60H
Manual 2100-586B
Page
6 of 25
LEFT SIDE
RIGHT SIDE
36"
36"
36"
36"
WARNING
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.
7. Secure rain flashing to wall and caulk across entire
length of top. See Figures 3A & 3B.
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.
PLACEMENT
1. 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.
2. Care should be taken to ensure that the recirculation
and obstruction of condenser discharge air does
not occur. Recirculation of condenser discharge
air can be from either a single unit or multiple
units. Any object such as shrubbery, a building
or a large object can cause obstructions to the
condenser discharge air. Recirculation or reduced
airflow caused by obstructions will result in reduced
capacity, possible unit pressure safety lockouts and
reduced unit service life.
Units with a draw through condenser, such as
the C**H 11 EER, it is recommended there be a
minimum distance of 15 feet between the front of
the unit and any barrier to airflow.
Minimum Clearances Required to
Combustible Materials
MODELS
C24H, C30H
C36H, C42H, C48H, C60H
SUPPLY AIR DUCT
CABINET
FIRST THREE FEET
1/4"
0"
1/4"
0"
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