Lennox KGC Series Unit Information page 42

D-Transitions
Optional supply/return
C1DIFF31B-1 and C1DIFF32B-1 are available for use
with the KGC 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
E-Supply and Return Diffusers
Optional flush-mount diffuser/return FD11 and extended
mount diffuser/return RTD11 are available for use with all
KGC units. Refer to manufacturer's instructions included
with transition for detailed installation procedures.
F-Outdoor Air Dampers
C1DAMP10B-2
Optional manual and motorized outdoor air dampers
(FIGURE 32) 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 position
G-K1ECON20B / K1ECON22B-1 Economizer,
(Field- or Factory-Installed)
See specific economizer installation instructions for
more detail for both K1ECON20B and high performance
economizer K1ECON22B1
Economizers use outdoor air for free cooling when
temperature and/or humidity is suitable. See FIGURE 31.
Below is a brief description of the K1ECON20B economizer.
The mixed air temperature sensor (R1) measures the
supply air sensible temperature. See FIGURE 30. The
outdoor air sensible control is the default economizer
control. An outdoor air single sensible sensor, S175, is
also provided. See TABLE 21 for outdoor and return air
(OA and RA) sensor options. Refer to instructions provided
with sensors for installation.
transition C1DIFF30B-1,
C1DAMP20B-1 and
(Title 24 California).
ECONOMIZER
An IAQ sensor is used when demand control ventilation
(DCV) is specified. Damper minimum position can be set
lower than traditional minimum air requirements resulting
in cost savings. The IAQ sensor allows the A6 to open
dampers to traditional ventilation requirements as room
occupancy (CO2) increases.
Sensors
Single OA Sensible
Single OA Sensible
Differential Enthalpy -
1 in OA and 1 in RA
IAQ Sensor
MIXED AIR SENSOR (R1) LOCATION
R1 MIXED
AIR SENSOR
ECONOMIZER
FIGURE 31
Page 42
TABLE 21
Dampers will modulate to 55°F dis-
charge air (RT6) when:
OA temperature (S175) is lower than free
cooling setpoint.
OA temperature and humidity (A7) is lower
than free cooling setpoint.
OA temperature and humidity (A7) is lower
than RA temperature and humidity (A62).
CO2 sensed (A63 ) is higher than CO2
setpoint.
FIGURE 30
ACCESSORY
PANEL MULLION
DIVIDER PANEL
(Attach with two
provided screws)
BOTTOM OF
COMPRESSOR
SECTION
FLANGED
RETURN AIR
OPENING