Page 39
VI−ACCESSORIES
The accessories section describes the application of most of
the optional accessories which can be factory or field installed
to the SCA/SCB units.
A−LARMF and S1CURB
SCA120
When installing either the SCA units on a combustible sur-
face for downflow discharge applications, the Lennox
S1CURB10111 14-inch or S1CURB11111 24-inch roof
mounting frame is used. The roof mounting frames are
recommended in all other applications but not required. If
the SCA units are not mounted on a flat (roof) surface,
they MUST be supported under all edges and under the
middle of the unit to prevent sagging. The units MUST be
mounted level within 1/16" per linear foot or 5mm per me-
ter in any direction.
The assembled S1CURB mounting frame is shown in fig-
ure 20. Refer to the roof mounting frame installation in-
structions for details of proper assembly and mounting.
The roof mounting frame MUST be squared to the roof and
level before mounting. Plenum system MUST be installed
before the unit is set on the mounting frame. Typical roof
curbing and flashing is shown in figure 21. Refer to the roof
mounting frame installation instructions for proper plenum
construction and attachment.
FIGURE 20
CENTER SUPPORTS
RETURN AIR
CROSS SUPPORT
SUPPLY AIR
CROSS SUPPORT
ROOF MOUNTING FRAME SCA120
FIGURE 21
SCA120 TYPICAL FLASHING DETAIL
ROOF CURB
(Extends around entire
perimeter of unit)
FIBERGLASS
INSULATION
(Furnished)
COUNTER FLASHING
(Field Supplied)
BASE
BOTTOM
RIGID INSULATION
(Field Supplied)
ROOFING
MATERIAL
CANT STRIP
(Field Supplied)
PACKAGED UNIT
NAILER STRIP
(Furnished)
3/4
(19)
4-1/4
(108)
SCA240/SCB288
When installing either the SCA/SCB units on a combustible
surface for downflow discharge applications, the Lennox
LARMF18/36 14-inch or 24-inch (356 mm or 610mm)
height roof mounting frame is used. The roof mounting
frames are recommended in all other applications but not
required. If the SCA/SCB units are not mounted on a flat
(roof) surface, they MUST be supported under all edges
and under the middle of the unit to prevent sagging. The
units MUST be mounted level within 1/16" per linear foot or
5mm per meter in any direction.
The assembled LARMF18/36 mounting frame is shown in
figure 22. Refer to the roof mounting frame installation in-
structions for details of proper assembly and mounting.
The roof mounting frame MUST be squared to the roof and
level before mounting. Plenum system MUST be installed
before the unit is set on the mounting frame. Typical roof
curbing and flashing is shown in figure 23. Refer to the roof
mounting frame installation instructions for proper plenum
construction and attachment.
FIGURE 22
ASSEMBLED ROOF MOUNTING FRAME
SCA240/SCB288
FRONT
END
END
BACK
CENTER SUPPORTS
(TWO PIECES EACH)
FIGURE 23
SCA240/SCB288 TYPICAL FLASHING DETAIL
ROOF CURB
(Extends around entire
perimeter of unit)
FIBERGLASS
INSULATION
(Furnished)
COUNTER FLASHING
(Field Supplied)
BASE BOTTOM
RIGID INSULATION
(Field Supplied)
ROOFING
MATERIAL
CANT STRIP
(Field Supplied)
PACKAGED UNIT
NAILER
STRIP
(Furnished)
3/4 (19)
4-1/4
(108)
To Next Page
Loading...
Need help?
General
