BAC-19xxxx FlexStat Application Guide
11 AG200824A
Space
CO
2
(AV57)
CO
2
Setpoint
(AV59)
0%
DCV Signal
Component
to OAD
100%
Basic DCV Mode
CO
2
Deadband
(AV58)
Outside Air
Damper
Position
Component
CO
2
Start Point
(AV61)
0%
Space
CO
2
(AV57)
CO
2
Max (Setpoint)
(AV62)
DCV Signal
Component
to OAD
100%
Standard DCV Mode
CO
2
Base
(AV60)
Outside Air
Damper
Position
Component
DEMAND CONTROL VENTILATION
Description
Menu
Options
Notes
Default
Value
Object DCV
Mode
CO
2
Level
Available as a rotation value on the display.
0 ppm
AV57
Select DCV
Mode
DCV Mode Select None, Basic, or Standard.
None
MSV12
Basic DCV
Setpoint
CO2 Basic
Setpoint
In
Basic
DCV mode, the desired CO
2
level at which point the economizer
damper opens for maximum outside air flow.
1200
ppm
AV59
Basic
Basic DCV
Deadband
CO2 Basic
Deadband
In
Basic
DCV mode, the amount the CO
2
level must drop below the
setpoint before DCV control is relinquished (and outside DCV air flow
returns to minimum).
200 ppm AV58
Standard DCV
Baseline (Out-
side Air CO
2
Level)*
In
Standard
DCV mode, the presumed average CO
2
concentration level
of
outside
air at the building’s location. Every week after installation,
the lowest detected reading in the previous week is written into AV60
(replacing the original default or previous value).
380 ppm AV60
Stand-
ard
Standard DCV
Start Point*
In
Standard
DCV mode, the CO
2
level (setpoint) at which the economizer
damper
begins to
modulate
open
. It equals the DCV CO
2
baseline plus
200
ppm, and the value is recalculated weekly.
580 ppm AV61
Standard DCV
Maximum
Allowed CO
2
Level*
In
Standard
DCV mode, the maximum allowed CO
2
concentration level
during an occupied period. The economizer damper modulates to
fully
open
at this level. It equals the DCV CO
2
baseline plus
600
ppm, and the
value is recalculated weekly.
980 ppm AV62
*NOTE: Standard DCV values are self-calculating and are not configurable by the user in the FlexStat menu.
CO
2
SENSORS AND DCV OPERATION
Introduction
BAC-19
5
xxx and BAC-19
3
xxx model FlexStats
include CO
2
sensors for
DCV (Demand Control
Ventilation)
operation in (BAC-19xx63) RTU, HPU,
4-pipe FCU, and (BAC-19xx36) AHU applications
with an outside air damper. See the illustrations
and descriptions of Basic and Standard DCV op-
tions and operations.
NOTE:
High CO
2
measurements may
indicate high levels of other airborne
containments.
