Page 34
VII-ACCESSORIES
The accessories section describes the application of most
installed to the LDT units.
A-C1CURB Mounting Frames
When installing the LDT units on a combustible surface
mounting frame is used. The roof mounting frames are
available in heights from 8 to 24 inches and are recom-
mended in all other applications but not required. If the
MUST be supported under all edges and under the middle
of the unit to prevent sagging. The units MUST be mount-
any direction.
The assembled C1CURB mounting frame is shown in
FIGURE 23. Refer to the roof mounting frame installation
instructions 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 in-
stalled before the unit is set on the mounting frame. Typi-
-
fer to the roof mounting frame installation instructions for
proper plenum construction and attachment.
CENTER
SUPPORTS
RETURN AIR
CROSS SUPPORT
SUPPLY AIR
CROSS SUPPORT
ASSEMBLED ROOF MOUNTING FRAME
FIGURE 23
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
TYPICAL FLASHING DETAIL
FIGURE 24
B-Transitions
Optional supply/return transition C1DIFF30B-1 is available
the appropriate C1CURB roof mounting frame. Transition
must be installed in the mounting frame before installing
the unit on the frame. Refer to the manufacturer’s instruc-
tions included with the transition for detailed installation
procedures.
LDT units. Refer to manufacturer’s instructions included
with transition for detailed installation procedures.
D-C1DAMP Outdoor Air Dampers Field- or Factory-In-
stalled
percent fresh air for return. Motorized damper opens to
minimum position simultaneously with the blower during
the occupied period and remains closed during the unoc-
cupied period. Manual damper assembly is manually op-
remains in that position.
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