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VII-ACCESSORIES
The accessories section describes the application of most
installed to the LHT units.
A-Roof Curbs
When installing the LHT units on a combustible surface
-
-
mounting frame is used. The assembled hybrid mounting
frame installation instructions for details of proper as-
sembly and mounting. The roof mounting frame MUST
be squared to the roof and level before mounting. Ple-
num system MUST be installed before the unit is set on
-
stallation instructions for proper plenum construction and
attachment.
frames are recommended in all other applications but
and under the middle of the unit to prevent sagging. The
or 5mm per meter in any direction.
ASSEMBLED HYBRID ROOF CURB
FIGURE 19
ROOF
MOUNTING FRAME
(Extends around entire
perimeter of unit)
FIBERGLASS
INSULATION
(Furnished)
COUNTER FLASHING
(Field Supplied)
UNIT BASE
BOTTOM
RIGID INSULATION
(Field Supplied)
ROOFING
MATERIAL
CANT STRIP
(Field Supplied)
NAILER STRIP
(Furnished)
UNIT BASE
RAIL
FIGURE 20
B-Transitions
Optional supply/return transitions C1DIFF33C-1 and
C1DIFF34C-1 are available for use with LHT series units
utilizing optional C1CURB roof curbs. Transition must be
installed in the roof curb before mounting the unit to the
frame. Refer to the manufacturer’s instructions included
with the transition for detailed installation procedures.
C-C1DAMP10 & E1DAMP20 Outdoor Air Dampers
set of dampers which may be manually or motor operated
to allow up to 25 percent outside air into the system at all
dampers can be cleaned with water and a mild detergent.
It should be sprayed with Filter Handicoater when dry prior
to re-installation. Filter Handicoater is R.P. Products coat-
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