Co Sensors And Dcv Operation; Introduction - KMC Controls BAC-19 FlexStat Series Application Manual

CO SENSORS AND DCV OPERATION
2

Introduction

BAC-195xxx and BAC-193xxx model FlexStats
include CO sensors for DCV (Demand Control
2
Ventilation) operation in (BAC-19xx63) RTU, HPU,
4-pipe FCU, and (BAC-19xx36) AHU applications
Basic DCV Mode
100%
Outside Air
Damper
Position
Component
0%
Menu
Description
Options
CO Level
2
Select DCV
DCV Mode
Mode
Basic DCV CO2 Basic
Setpoint Setpoint
Basic DCV CO2 Basic
Deadband Deadband
Standard DCV
Baseline (Out-
side Air CO
2
Level)*
Standard DCV
Start Point*
Standard DCV
Maximum
Allowed CO
2
Level*
*NOTE: Standard DCV values are self-calculating and are not configurable by the user in the FlexStat menu.
BAC-19xxxx FlexStat Application Guide
DCV Signal
Component
to OAD
CO
2 Space
Deadband
CO
(AV58)
(AV57)
CO
2
Setpoint
(AV59)
DEMAND CONTROL VENTILATION
Notes
Available as a rotation value on the display.
Select None, Basic, or Standard.
In Basic DCV mode, the desired CO
damper opens for maximum outside air flow.
In Basic DCV mode, the amount the CO
setpoint before DCV control is relinquished (and outside DCV air flow
returns to minimum).
In Standard DCV mode, the presumed average CO
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).
In Standard DCV mode, the CO
damper begins to modulate open. It equals the DCV CO
200 ppm, and the value is recalculated weekly.
In Standard DCV mode, the maximum allowed CO
during an occupied period. The economizer damper modulates to fully
open at this level. It equals the DCV CO
value is recalculated weekly.
with an outside air damper. See the illustrations
and descriptions of Basic and Standard DCV op-
tions and operations.
NOTE: High CO
100%
Outside Air
Damper
Position
Component
2
0%
level at which point the economizer
2
level must drop below the
2
concentration level
2
level (setpoint) at which the economizer
2
concentration level
2
baseline plus 600 ppm, and the
2
11
measurements may
2
indicate high levels of other airborne
containments.
Standard DCV Mode
DCV Signal
Component
to OAD
CO CO
2 2
Base Start Point
(AV60) (AV61)
Default
Value
0 ppm
None
1200
ppm
200 ppm AV58
380 ppm AV60
baseline plus 580 ppm AV61
2
980 ppm AV62
Space
CO
2
(AV57)
CO
2
Max (Setpoint)
(AV62)
DCV
Object
Mode
AV57
MSV12
AV59
Basic
Stand-
ard
AG200824A