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INSTALLATION
WALL MOUNTING INFORMATION
1. Two holes for the supply and return air openings
must be cut through the wall as shown in Figures
Figures 3A – D (pages 8 – 11).
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 and brick walls must be thoroughly
inspected to insure 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. Models J18 and J24 are suitable for 0" clearance
to the unit and supply air duct. Models J30, J36,
J42, J48, J60 and J72 require a minimum of 1/4"
clearance to combustible materials to combustible
materials for the supply air duct flange and the
first 3' of supply air duct. 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 3A
– D for details on opening sizes.
3. Locate and mark lag bolt locations and bottom
mounting bracket location (see Figures 3A – D).
4. Mount bottom mounting bracket.
5. Hook top rain flashing, attached to front-right of
supply flange for shipping, under back bend of top.
Clearances Required for Service Access and
Adequate Condenser Airflow
MODELS
J18A, J24A, J30A, J36A
J18L, J24L, J30L, J36L
J42A, J48A, J60A, J72A
J42L, J48L, J60L, J72L
NOTE: For side-by-side installation of two J**A models there
must be 20" between units. This can be reduced to 15" by using
a J**L model (left side compressor and controls) for the left unit
and J**A (right side compressor and controls) for right unit.
See Specification S3515.
Manual 2100-651D
Page
6 of 32
LEFT
RIGHT
DISCHARGE
SIDE
SIDE
SIDE
15"
20"
10'
20"
15"
10'
20"
20"
10'
20"
20"
10'
WARNING
Failure to provide the 1/4" clearance between
the supply duct and a combustible surface
for the first 3' of duct can result in fire causing
damage, injury or death.
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 bolts.
7. Secure rain flashing to wall and caulk across entire
length of top (see Figures 3A – 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. On side-by-side installations, maintain a minimum
of 20" clearance on control side to allow access
to control panel and heat strips and proper airflow
to the outdoor coil. Additional clearance may be
required to meet local or national codes.
Minimum Clearances Required to
Combustible Materials
MODELS
J18A, L/J24A, L
J30A, L/J36A, L
J42A, L/J48A, L
J60A, L/J72A, L
SUPPLY AIR DUCT
CABINET
FIRST 3'
0"
0"
1/4"
0"
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