Submittal Sheet
Table Of Contents
- Contents/Cover
- Description and Application
- Features
- Configurability
- Models
- Application/Model Selection Guide
- Specifications, General
- Specifications, Motion Sensor
- Specifications, CO2 Models Only
- Demand Control Ventilation (DCV)
- Accessories
- Dimensions and Connectors
- Sample Installation
- Product and Documentation Awards
- Support
7
Although BAC-12xxxx FlexStats do not have a built-
in CO
2
sensor, they still have DCV control sequences
available. When DCV is enabled in these models,
IN9 is assumed to be connected to an external KMC
SAE-10xx CO
2
sensor. BAC-13xxxx/14xxxx FlexStats
also have the external sensor option, and if used, the
highest of the two readings (internal vs. external)
will be used to control DCV sequences. The CO
2
ppm display (when enabled) also shows the highest
of the two levels.
NOTE: The three DCV Conguration graphs
on the left show the DCV component
of the signal to the outside air damper.
Depending on the conditions and the DCV
conguration, 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 of them. (If there is a
Low Limit alarm, however, these signals
are overridden, and the damper is closed.)
NOTE: DCV is only available when using an
AHU, RTU, or HPU application with a
modulating economizer option enabled.
Without that conguration, DCV will
not appear in menus, but the CO
2
ppm
readings will (unless turned o in the User
Interface menu) still show on the lower
right of the display.
The graph below shows an example of how a cool-
ing setpoint and the outside air damper position
could be eciently controlled by a FlexStat’s built-in
combination of schedule, motion sensor (congured
for occupancy standby and occupancy override),
and CO
2
sensor (congured for Advanced DCV).
When using applications with a modulating econo-
mizer option, the three types of Demand Control
Ventilation (DCV) congurations available are:
◆ Basic—Provides simple DCV, modulating the
outside air damper in direct response to the cur-
rent CO
2
level with respect to its setpoint. Basic
DCV is much
more energy
ecient than
no DCV at
all, while
maintain-
ing adequate
IAQ (Indoor
Air Quality).
It is the easi-
est DCV method to congure. However, where
VOCs, radon, or other pollutants become exces-
sive during unoccupied times (with no ventila-
tion), the FlexStat’s Standard or Advanced DCV
conguration is recommended.
◆ Standard—When the BAC-13xxxx seings are
properly congured, this complies with CA Title
24, Section
121(c). This
would also
apply to a
properly
congured
BAC-12xxxx
with a remote
SAE-10xx CO
2
sensor. Stan-
dard DCV, under most conditions, is somewhat
less energy ecient than Basic, but it enhances
IAQ.
◆ Advanced—When the seings are properly
congured, this conguration complies with
CA Title 24,
Section 121(c)
and ASHRAE
Standard
62.1-2007 and
follows guide-
lines by Port-
land Energy
Conservation,
Inc. (PECI).
Although Advanced DCV is the most complex to
congure, it is more energy ecient than Stan-
dard while still optimizing IAQ.
Demand Control Ventilation (DCV)
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
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
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)
For more details about DCV conguration and
operation, see the FlexStat Operation Guide and
FlexStat Application Guide.