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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 Figure 2.
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.
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 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 for Model Series H36,
H42, H48 and H60. 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
2A-C for details on opening sizes.
Minimum Clearances Required to
Combustible Materials
MODELS
H24A, H24L
H36A, H36L
H42A, H42L
H48A, H48L
H60A, H60L
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.
Manual 2100-639A
Page
6 of 28
SUPPLY AIR DUCT
CABINET
FIRST 3'
0"
0"
1/4"
0"
1/4"
0"
Clearances Required for Service Access and
Adequate Condenser Airflow
MODELS
H24A, H36A
H24L, H36L
H42A, H48A, H60A
H42L, H48L, H60L
NOTE: For side by side installation of two (2) H**A models there
must be 20" between units. This can be reduced to 15" by using
a H**L model (left side compressor and controls) for the left unit
and H**A (right side compressor and controls) for right unit.
3. Locate and mark lag bolt locations and bottom
mounting bracket location (see Figure 2).
4. Mount bottom mounting bracket.
5. Hook top rain flashing, attached to front-right
corner 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" diameter flat washers on the lag
bolts.
7. Secure rain flashing to wall and caulk across entire
length of top (see Figure 2).
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 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.
10. 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 other 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.
For units with blow through condensers, it is
recommended there be a minimum distance of 10'
between the front of the unit and any barrier or 20'
between the fronts of two opposing (facing) units.
LEFT
RIGHT
DISCHARGE
SIDE
SIDE
SIDE
15"
20"
10'
20"
15"
10'
20"
20"
10'
20"
20"
10'
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