Manual 2100-585B
Page 6 of 19
Minimum Clearances Required to
Combustible Materials
MODELS
SUPPLY AIR DUCT
FIRST THREE FEET
CABINET
H42A, L / H48A, L
H60A, L
1/4"
0"
Clearances Required for Service Access
and Adequate Condenser Airflow
MODELS
LEFT SIDE
RIGHT SIDE
H42A, H48A, H60A
20"
20"
H42L, H48L, H60L
20"
20"
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 HA (right side compressor and controls) for right unit.
INSTALLATION INSTRUCTIONS
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.
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 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 for model series
H42, H48 and H60. 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 2 for
details on opening sizes.
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 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.
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 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.
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.
