Lennox KCC Series Unit Information page 36

F-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
20. Below is a brief description of the K1ECON20B
economizer.
The mixed air temperature sensor (R1) measures the
supply air sensible temperature. See FIGURE 19. The
outdoor air sensible control is the default economizer
control. An outdoor air single sensible sensor, S175,
is also provided. See TABLE 15 for outdoor and return
air (OA and RA) sensor options. Refer to instructions
provided with sensors for installation.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.
(Title 24 California).
ECONOMIZER
FIGURE 20
Page 36
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
FLANGED
RETURN AIR
OPENING
TABLE 15
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 19
ACCESSORY
PANEL MULLION
DIVIDER PANEL
(Attach with two
provided screws)
BOTTOM OF
COMPRESSOR
SECTION