BAC-19xxxx FlexStat Application Guide 13 AG200824A
NOTE: Standard DCV mode complies with
2019 California Title 24 Part 6
120.1(c)4. To comply with Title 24:
• If there is an outside air CO
2
sensor,
then the OAD begins to modulate
open starting at the baseline CO
2
level plus 200 ppm setpoint to the
maximum open setpoint at the
baseline CO
2
level plus 600 ppm.
• If there is no outside CO
2
sensor, then
the baseline CO
2
level shall be set to
400 ppm (for Title 24).
NOTE: Every week after the FlexStat’s
installation, the lowest detected space
CO
2
reading in the previous week is
written into AV60 (replacing the original
default or previous value). This value
is assumed to be the approximate
CO
2
level of outside air during an
unoccupied period—thereby emulating
an outside CO
2
sensor. The value in
AV60 is used in the DCV calculations
for the following week until it is
replaced by an updated value.
WIRING CONSIDERATIONS
General Wiring Considerations
CAUTION
The BAC-19xxxx models are
NOT compatible with the
backplates of older BAC-
10xxx/12xxxx/13xxxx/14xxxx
FlexStats! If replacing an older
FlexStat, replace the backplate as
well.
CAUTION
To avoid damage from ground loops
and other communication issues
in networked FlexStats, correct
phasing on MS/TP network and power
connections on ALL the networked
controllers is critically important.
CAUTION
Relays are for Class-2 voltages (24
VAC) only. Do not connect line voltage
to the relays!
Do not mistakenly connect 24 VAC to
an analog output ground.
NOTE: FlexStat relays are NO, SPST (Form
“A”). (To emulate binary outputs with
the analog outputs, set the output
voltage to be either 0 or 12 VDC in
Control Basic.)
• Because of the many connections (power,
network, inputs, outputs, and their respective
grounds or switched commons), be sure wiring
is well planned before installation of conduit!
• For information on principles and good practices
when connecting transformers, see Tips for
Connecting 24-Volt Power Application Note
(AN0604D).
• To prevent excessive voltage drop, use a
conductor size that is adequate for the wiring
length! Allow plenty of “cushion” to allow for
transient peaks during startup.
• Make sure that conduit for all wiring has
adequate diameter for all necessary wiring.
Using 1-inch conduit and junction boxes is
recommended!
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