KMC Controls FlexStat Operation Guide User Manual
Page 12
FlexStat 12
Operation Guide, Rev. R
NOTE: Not all applications have a modulating
economizer option. Without a modulating
economizer selected, DCV will not appear
in any menus, but the (Advanced) CO
2
Sensor menu will remain and the CO
2
ppm
readings will still show on the display.
NOTE: An alarm is generated when the CO
2
level is
too high for too long. See
.
NOTE: The various Outside Air (OA) % settings
available are the percentage that the OA
damper is open and not the percentage
of OA flow. These settings should be
measured and set accordingly.
NOTE: See the DCV section in the relevant
Sequence of Operation of the
for more information
about the modes and options described in
general terms here.
The three types of DCV configurations available
are:
• BASIC DCV—Provides simple DCV, modulat-
ing the outside air damper in direct response to
the current CO
2
level with respect to its setpoint.
Basic DCV is much more energy efficient than no
DCV at all, while maintaining adequate IAQ (In-
door Air Quality). It is the easiest DCV method
to configure. However, where VOCs, radon, or
other pollutants become excessive during unoc-
cupied times (with no ventilation), the FlexStat’s
Standard or Advanced DCV configuration is
recommended.
CO
2
Setpoint
0%
Space CO
2
CO
2
Maximum
DCV Signal
Component
to OAD
100%
Basic DCV Configuration
CO
2
Base
Outside Air
Damper
Position
Component
STANDARD DCV—When the BAC-13xxxx settings
are properly configured, this complies with
also apply to a properly configured BAC-
12xxxx with a remote SAE-10xx CO
2
sensor.
Standard DCV, under most conditions, is
somewhat less energy efficient than Basic,
but it enhances IAQ.*
*NOTE: The CO
2
sensors in the BAC-13xxxx series
FlexStats (as well as properly configured
SAE-10xx CO
2
detectors) have been certified
to comply with CA Title 24, Section 121(c),
as well as sub-paragraph 4.F that specifies
accuracy will be maintained within
tolerance for a minimum of 5 years without
recalibration. See the data sheet for more
information.
CO
2
Setpoint
OA Full
OA Area
0%
Space CO
2
CO
2
Maximum
DCV Signal
Component
to OAD
100%
Standard DCV Configuration
CO
2
Base
Outside Air
Damper
Position
Component
“Basic” Signal
“Standard”
Signal
• ADVANCED DCV—When the settings are
properly configured, this configuration complies
with
and follows guidelines by
.
Although Advanced DCV is the most complex to
configure, it is more energy efficient than Stan-
dard while still optimizing IAQ.
OA Max
OA Full
OA Area
0%
Space CO
2
CO
2
Maximum
DCV Signal
Component
to OAD*
100%
Advanced DCV Configuration
CO
2
Base
Outside Air
Damper
Position
Component
*Under Normal
Vent Mode operation
(see Vent Mode description)
NOTE: The three graphs above show the DCV
component of the signal to the outside
air damper. Depending on the conditions
and the DCV configuration, the signal
to the damper might be controlled by
Minimum Position, Economizer Loop, or
other components. The maximum of these
component values is used, not the sum