Electrical; Vi−Accessories; Larmf Roof Mounting Frames - Lennox LGA Series Unit Information

F−Electrical
1− Check all wiring for loose connections.
2− Check for correct voltage at unit (unit operating).
3− Check amp−draw on both condenser fan motor and
blower motor.
Fan Motor Rating Plate ____ Actual ________
Indoor Blower Motor Rating Plate____ Actual____
VI−ACCESSORIES
The accessories section describes the application of most of
the optional accessories which can be factory or field installed
to either the LGA/LGC/LCA/LCC units.
A−LARMF18/36-14, 24 or
LARMH30/36−30,41 Mounting Frames
When installing the LGA/LGC/ LCA/LCC units on a combus-
tible surface for downflow discharge applications, the Lennox
LARMF18/36 14-inch or 24-inch (356 mm or 610mm) height
roof mounting frame is used. For horizontal discharge applica-
tions, use LARMFH30/36 30-inch or 41-inch (762mm or
1041mm) height roof mounting frame. This frame converts unit
from down-flow to horizontal air flow. The 14 and 24 inch (356
and 610mm) downflow and 41 inch (1041mm) horizontal
frame meets National Roofing Code requirements. The roof
mounting frames are recommended in all other applications
but not required. If the 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.
ASSEMBLED ROOF MOUNTING FRAME
END
FRONT
CENTER SUPPORTS
(TWO PIECES EACH)
FIGURE 35
BACK
END
The assembled LARMF18/36 mounting frame is shown in fig-
ure 35. Refer to the roof mounting frame installation instruc-
tions 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 36. Refer to the roof mounting frame installa-
tion instructions for proper plenum construction and attach-
ment.
TYPICAL FLASHING DETAIL
UNIT BASE
BOTTOM
FIBERGLASS
INSULATION
(Furnished)
NAILER STRIP
(Furnished)
RIGID INSULATION
(Field Supplied)
ROOF
MOUNTING FRAME
(Extends around entire
perimeter of unit)
Page 60
UNIT BASE
RAIL
COUNTER FLASHING
(Field Supplied)
CANT STRIP
(Field Supplied)
ROOFING
MATERIAL
FIGURE 36