Manual

FlexStat 11 Operation Guide, Rev. R
(Advanced) CO
2
Sensor (and DCV)
CO2 SENSOR
SENSOR INFO
CALIBRATION
CO2 SENSOR INFO
MODEL: T6615
SUB VOL: A15
SW DATE: 090217
S/N: AB00011759
CO2: 873
ELEVATION: 0
STATUS: NORMAL
CO2 CALIBRATION
ELEVATION: 0
REFERENCE GAS: 300
MODE: MONITOR
CO2: 1067
STATUS: NORMAL
CAL TIME: 00:00
CO
2
Sensor Setup and Information
NOTE: Set the desired CO
2
setpoint under the
Setpoints menu. See Setpoints on page 25.
For maximum sensor accuracy, enter the elevation
(altitude)abovesealevel of the building’s location.
(The default value is 0.) Elevation for any particular
location can be found at such sources as www.earth-
tools.org. (For very tall buildings, the upper oors
would have a higher elevation than lower oors.)
After power is rst applied or the FlexStat is restart-
ed, the sensor goes through a warm-upfor approxi-
mately half a minute. During the time the sensor
count will be 0 ppm and the Status line will display
WARMUP instead of NORMAL.
The sensoranditsrmware are identied by the
model, the compilation subvolume (SUB VOL), com-
pilation date (SW DATE in yymmdd format), and
serial number.
NOTE: With the CO
2
sensor enabled, a trend log is
automatically generated. See (Advanced)
Trend Logs on page 20.
The BAC-13xxxx models do not have a calibration
with gas option. It uses Automatic Background
Logic, or ABC Logic
™
, a patented self-calibration
technique designed to be used inapplicationswhere
concentrationswilldroptooutsideambientcondi-
tions(approximately400ppm)atleastthreetimes
ina14dayperiod, typically during unoccupied
periods.
The BAC-14xxxx models have a calibrationoption
forapplyinggastothesensor for maintaining maxi-
mum accuracy. These models have a dual channel
sensor (a CO
2
channel measures gas concentration,
and a reference channel measures the sensor signal
intensity). Self-calibrations are performed approxi-
mately every 24 hours using the reference channel.
During the self-calibration the sensor PPM reading is
frozen and will not react to changing CO
2
.
For instructionsoncalibratingthe BAC-14xxxx
models withgas, see the CO
2
Sensor Calibration sec-
tion in the FlexStatApplicationGuide.
DCV (Demand Control Ventilation) Setup
DAMPER SETUP
ECON:
DCV: ADVANCED
DCV SETUP
MIN POSITION: 0%
CNTRL (0–100%): 2–10 V
ECON ENBLE TEMP: 55° F
LOW LIMIT ALARM: 45° F
MODULATING
DCV SETUP
VENT MODE: STARTUP
DCV DAMPER SETUP
CO2 MAX (PPM): 1000
CO2 BASE (PPM): 400
OA AREA: 2%
OA FULL: 5%
OA MAX: 40%
DCV SETUP
OA PURGE: 0%
OA LOW VENT: 65°F
OA HIGH VENT: 80°F
FAN MAX OFF (MINS): 30
CLG DESIGN TEMP: 95°F
HTG DESIGN TEMP: 20°F
VENT OVRIDE (MINS): 30
The CO
2
sensor is used with DCV (Demand Control
Ventilation sequences to provide optimal ventila-
tion and energy savings for a space. When BAC-
12xxxx/13xxxx/14xxxx models have an application
with the CO
2
sensor AND a modulating economizer
option enabled, menu items for DCV (Demand Con-
trol Ventilation) will appear. Most DCV seings are
accessed from the Damper setup menu. See Damper
Setup on page 7, Setpoints on page 25, and DCV (De-
mand Control Ventilation) on page 24.
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 the Damper
Setup menu of these models, IN9 is assumed to be
connected to an external SAE-10xx CO
2
(duct or
space) sensor. 0–5VDConthatinput (congured
in the (Advanced) Inputs menu)willmapto0–2000
ppm.TheoutputoftheconnectedSAE-10xxmust
alsobeconguredtomatchtheFlexStat’sinput (see
the installation guide for the appropriate SAE-10xx
model), and the FlexStat’s IN9 pull-upresistor must
be set for 0–12VDC (see the appropriate FlexStat
installation guide)! 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 (if enabled) also shows the highest of the two
levels. (Allow at least 15 minutes after installation for
the reading to stabilize.)