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Connections and Wiring
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!
• To prevent excessive voltage drop, use a conduc-
tor size that is adequate for the wiring length!
Allow plenty of "cushion" to allow for tran-
sient peaks during startup.
• Make sure that conduit for all wiring has ad-
equate diameter for all necessary wiring. Using
1-inch conduit and junction boxes is recommend-
ed! Use external junction boxes above the ceiling
or in another convenient location as needed
to make connections that run to the FlexStat's
junction box.
• Using multiple conductor wires for all inputs
(e.g., six conductor) and outputs (e.g., 12 conduc-
tor) is recommended. Grounds for all the inputs
can be combined on one wire.
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.
MS/TP Wiring
Connect the –A terminals in parallel with all other –A
terminals on the network and the +B terminals in paral-
lel with all other +B terminals. (See Illustrations 2 and
4.) Connect the shields of the cable (Belden cable #82760
or equivalent) together at each device. Use a wire nut or
the S terminal in KMC BACnet controllers. (FlexStats,
however, do not have an S terminal.) Connect the cable
shield to a good earth ground at one end only.
NOTE: The S terminal in KMC controllers is
provided as a connecting point for the
shield. The terminal is not connected to the
ground of the controller. When connecting
to controllers from other manufacturers,
verify the shield connection is not
connected to the controller's ground.
For more information on principles and good practic-
es when connecting an MS/TP network, see Planning
BACnet Networks (Application Note AN0404A).
BAC-1xx63 Series (6 Relays, 3 Analog Outputs)
MS/TP EOL (End-Of-Line) Termination
The controllers/thermostats on the physical ends of
the EIA-485 wiring segment must have end-of-line
termination installed for proper network operation.
(See Illustrations 2 and 3.) If a FlexStat is at the physi-
cal end of the MS/TP network line, set both the EOL
termination switches (1 and 2) to On (to the right)
on the back of the circuit board. If not on the end,
ensure that both switches are Off (left).
EOL On
Off
Illustration 2—MS/TP Network End-Of-Line Termination
Pushed Left
EOL =
OFF
ON
1
1
2
2
IN3 =
Ω
10K
0-12 V
5
5
6
6
Illustration 3—EOL and Pull-Up Switch Resistor Positions
NOTE: IN1 is the room temp.
sensor AI1
NOTE: SC = Switched
(Relay) Common
BACnet
MS/TP
Network
Inputs
(Wiring Inputs
and Outputs
GND
Dependent on
Application)
Common/–/C
24 VAC
Phase/ /R
Illustration 4—(BAC-1xx63C) Terminals and Connections
2
Off
Off
Pushed Right
1
Ω
10K
2
3
4
5
6
Ω
10K
7
8
GND 7–9
+B
SC 4–6
–A
IN4
IN3
SC 1–3
IN2
Installation Guide
EOL On
IN4 =
0-12 V
3
3
4
4
IN2 =
0-12 V
7
7
8
8
Outputs
Analog 9
Analog 8
Analog 7
Relay 6
Relay 5
Relay 4
Relay 3
Relay 2
Relay 1
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