Johnson Controls FAC2611-0U, Installation Instructions Manual, Page: 6 / 25

Figure 5: SA Bus Terminal Block Wiring
Note: The SA PWR terminal supplies 15 VDC. The SA
PWR terminal can be used to connect (daisy
chain) the 15 VDC power leads on the SA bus.
FC Bus Port
The FC bus port on the front of the controller is an RJ-12,
6-position modular jack that provides a connection for
the Bluetooth
® Commissioning Converter, or ZFR/ZFR
Pro Wireless Field Bus Router.
The FC bus port is connected internally to the FC bus
terminal block. See
Comm Bus and Power Supply
Terminal Block Rating and Requirements Table for more
information. The FC bus port pin assignment is shown in
Figure 6 .
Note: When the FAC is configured for N2 network
communication, the FC bus port is not used.
Figure 6: Pin Number Assignments for Sensor, SA
Bus, and FC Bus Ports on Field Controllers
Sensor Port
The Sensor (SA Bus) port on the bottom of the controller
is an RJ-12, 6-position modular jack that provides a
connection for the VAV Balancing Tool, specified network
sensors, or other SA Bus devices with RJ-12 plugs.
The Sensor port is connected internally to the SA bus
terminal block. See
Comm Bus and Power Supply
Terminal Block Rating and Requirements Table for more
information. The Sensor Port pin assignment is shown
in
Figure 6 .
Supply Power Terminal Block
The 24 VAC supply power terminal block is a gray,
removable, 3-terminal plug that fits into a board-mounted
jack on the top right of the controller.
Wire the 24 VAC supply power wires from the transformer
to the HOT and COM terminals on the terminal plug as
shown in
Figure 7 . The middle terminal on the supply
power terminal block is not used. See Comm Bus and
Power Supply Terminal Block Rating and Requirements
Table
for more information about the Supply Terminal
Block.
Figure 7: 24 VAC Supply Power Terminal Block Wiring
Important: Connect 24 VAC supply power to the field
controller and all other network devices so
that transformer phasing is uniform across
the network devices. Powering network
devices with uniform 24 VAC supply power
phasing reduces noise, interference, and
ground loop problems. The field controller
does not require an earth ground
connection.
6 FAC2611-0U Advanced Application Field Equipment Controller Installation Instructions