Accessories - Lennox KCC Series Unit Information

VII-OPTIONAL ACCESSORIES
The accessories section describes the application of most
of the optional accessories which can be installed to the
KCC units.
A-Drain Pan Overflow Switch S149 (optional)
The overflow switch is used to interrupt cooling operation
when excessive condensate collects in the drain pan.
The N.O. overflow switch is controlled by K220 and DL46
relays, located in the unit control panel. When the overflow
switch closes, 24VAC power is interrupted and after a
fivesecond delay unit compressors are de-energized.
Once the condensate level drops below the set level, the
switch will open. After a five-minute delay the compressor
will be energized.
B-C1CURB Mounting Frames
When installing units on a combustible surface for
downflow discharge applications, the C1CURB roof
mounting frame is used. The roof mounting frames are
recommended in all other applications but not required.
If the KCC units are not installed 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 installed level within 1/16" per linear foot or 5mm per
meter in any direction.
The assembled C1CURB mounting frame is shown in
FIGURE 17. Refer to the roof mounting frame installation
instructions for details of proper assembly and installation.
The roof mounting frame MUST be squared to the roof
and level before installation. Plenum system MUST be
installed before the unit is set on the mounting frame.
Typical roof curbing and flashing is shown in FIGURE 18.
Refer to the roof mounting frame installation instructions
for proper plenum construction and attachment.
ASSEMBLED ROOF MOUNTING FRAME
SUPPLY AIR
OPENING
RETURN AIR
OPENING
FIGURE 17
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)
C-Transitions
Optional supply/return
C1DIFF31B-1 and C1DIFF32B-1 are available for use
with the KCC 7.5 through 12.5 ton units, utilizing optional
C1CURB roof mounting frames. Transition must be
installed in the C1CURB mounting frame before setting the
unit on the frame. Refer to the manufacturer's instructions
included with the transition for detailed installation
procedures
D-Supply and Return Diffusers
Optional flush-mount diffuser/return FD11 and extended
mount diffuser/return RTD11 are available for use with all
KCC units. Refer to manufacturer's instructions included
with transition for detailed installation procedures.
E-Outdoor Air
C1DAMP10B-2
Optional manual and motorized outdoor air dampers
(FIGURE 21) provide up to 25 percent fresh air for
return. Motorized damper opens to minimum position
simultaneously with the blower during the occupied period
and remains closed during the unoccupied period. Manual
damper assembly is manually operated; damper position
is manually set at installation and remains in that positio
Page 35
UNIT BASE RAIL
COUNTER FLASHING
(Field Supplied)
CANT STRIP
(Field Supplied)
ROOFING
MATERIAL
FIGURE 18
transition C1DIFF30B-1,
Dampers C1DAMP20B-1 and