Product Overview

FlexStat (General) 5 Application Guide, Rev S
Terminal Blocks and (General) Connections
Wiring Considerations
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! See the respective model’s
installation guide for more details.
CAUTION
To avoid damage from ground loops and other communication
issues in networked FlexStats, correct phasing on network and
power connections on ALL the networked controllers is critically
important.
• 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 recom-
mended!
• Use external junction boxes above the ceiling or in another conve-
nient location as needed to make connections that run to the Flex-
Stat’s junction box.
• Using multiple conductor wires for all inputs (e.g., six conductor)
and outputs (e.g., 12 conductor) is recommended. Grounds for all
the inputs can be combined on one wire.
IN9
IN8
GND
IN7
+B
–A
IN4
IN3
GND
IN2
Common/–/C
Phase/ /R
Analog 9
GND 7–9
Analog 8
Analog 7
Relay 6
SC 4–6
Relay 5
Relay 4
Relay 3
SC 1–3
Relay 2
Relay 1
Outputs
(Wiring Cutout in Backplate)
MS/TP
Network
Inputs
24 VAC
(Wiring is
dependent on
application)
Inputs
IP/Ethernet
Network
(Optional)
NOTE: IN1 and IN5–6 are
reserved for internal sensors
NOTE: SC = Switched
(relay) Common
The original BAC-10000 series FlexStats (discontinued in August 2013)
had three external inputs. Newer BAC-12xxxx/13xxxx/14xxxx FlexStats
have six external inputs and are not compatible with the older BAC-
10000 series backplates.
BAC-12xxxx FlexStats (with extra pins) can be (improperly) plugged into
a BAC-10000 series backplate, resulting in the power, inputs, and MS/
TP communications connections being mismatched. In such a case, that
FlexStat will be damaged and possibly the MS/TP communications
circuitry of other FlexStats on the same MS/TP network! Even after re-
placing the backplate and installing a new FlexStat, other FlexStats on
the network might no longer communicate properly on the network!
BAC-13xxxx/14xxxx CO
2
FlexStats have a larger backplate with horizon-
tal instead of vertical terminals. These FlexStats are unlikely to be acci-
dentally forced onto a wrong backplate.
When replacing a BAC-10000 series FlexStat with a BAC-
12xxxx/13xxxx/14xxxx FlexStat, replace the old backplate with the one
included with the new FlexStat.