Dcv (Demand Control Ventilation) Setup - KMC Controls FlexStat BACnet Operation Manual

DCV (Demand Control Ventilation) Setup

DAMPER SETUP
ECON: MODULATING
DCV: ADVANCED
DCV SETUP
MIN POSITION: 0%
DCV SETUP
CNTRL (0–100%): 2–10 V
VENT MODE: STARTUP
ECON ENBLE TEMP: 55° F
DCV DAMPER SETUP
LOW LIMIT ALARM: 45° F
CO2 MAX (PPM): 1000
CO2 BASE (PPM): 400
OA AREA: 2%
OA FULL: 5%
OA MAX: 40%
The CO sensor is used with DCV (Demand Control
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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 sensor AND a modulating economizer
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option enabled, menu items for DCV (Demand Con-
trol Ventilation) will appear. Most DCV settings are
accessed from the Damper setup menu. See Damper
Setup on page 7, Setpoints on page 23, and DCV (De-
mand Control Ventilation) on page
Although BAC-12xxxx FlexStats do not have a built-
in CO sensor, they still have DCV control sequences
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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
space) sensor. 0–5 VDC on that input (configured
in the (Advanced) Inputs menu) will map to 0–2000
ppm. The output of the connected SAE-10xx must
also be configured 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
display (if enabled) also shows the highest of the two
levels. (Allow at least 15 minutes after installation for
the reading to stabilize.)
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
Sensor menu will remain and the CO
readings will still show on the display.
NOTE: An alarm is generated when the CO
too high for too long. See Alarms on page
FlexStat
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
21.
(duct or
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level is
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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 FlexStat
Application Guide for more information
about the modes and options described in
general terms here.
The three types of DCV configurations available
are:
• BASIC—provides basic DCV, modulating the
outside air damper in direct response to the cur-
rent CO level with respect to its setpoint.
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• STANDARD—When the BAC-13xxxx settings
are properly configured, complies with CA Title
24, Section 121(c). This would also apply to a
properly configured BAC-12xxxx with a remote
SAE-10xx CO
• ADVANCED—When the settings are properly
configured, complies with ASHRAE Standard
62.1-2010 and follows guidelines by Portland
Energy Conservation, Inc. (PECI).
*NOTE: The CO
FlexStats (as well as properly configured
SAE-10xx CO
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.
The three types of DCV configurations have vari-
ous combinations of the following options.
CLG DESIGN TEMP = The highest outside air
temperature (95° F default) for which the
building's cooling system is designed.
CO2 MAX (PPM) = The desired maximum CO
ppm
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concentration level during an occupied
period (1000 ppm default). In BASIC and
STANDARD DCV modes, the economizer
damper will modulate to fully open at this
level.
CO2 SETPT (PPM) = The desired CO
point the economizer damper will begin
modulating open from MIN POSITION
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ppm
(600 ppm default). Below this level,
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the economizer damper will be at MIN
POSITION during Occupied mode.
21.
12
sensor.*
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sensors in the BAC-13xxxx series
2
detectors) have been certified
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level at which
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Operation Guide, Rev. L
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