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switches allow you to select your protocol (and baud rate) of
choice among the four most popular protocols in use today:
BACnet, Modbus, Johnson N2 and LonWorks.
The RTU Open cont rol is factory--mounted in the unit’s
main control box, to the le ft of the Light Commercial
Terminal Board (LCTB). Factory wiring is completed
through harnesses connected to the LCTB. Field
connec tions for RTU Open sensors will be made at the
Phoenix connectors on the RTU Open board. The
factory--installe d RTU Open control includes the
supply--air tempera ture (SAT) sensor. The outdoor air
temperature (OAT) sensor is included in the
FIOP/accessory EconoMi$er2 package.
SENSORY/ACCESSORY
INSTALLATION
There are a variety of sensors and accessories available
for the RTU-OPEN. Some of these can be factory or field
installed, while others are only field installable. The
RTU-OPEN controller may also require connection to a
building network system or building zoning system. All
field control wiring that connects to the RTU-OPEN must
be routed through the raceway built into the corner post of
the uni t or secured to the unit control box with electrical
conduit. The unit raceway provides the UL required
clearance between hi gh and low-voltage wiring. Pass the
control wire s through the hole provided in the corner post,
then feed the wires thorough the raceway to the
RTU-OPEN. Connect the wires to the removable Phoenix
connec tors and then reconnect the connectors to the board.
IMPORTANT: Refer to the specific sensor or accessory
instructions for its proper installation and for rooftop unit
installation refer to base unit installation instructions and
the unit’s wiring diagrams.
ELECTRICAL SHOCK HAZARD
Failure to follow thi s warning could result in personal
injury, death and/or equipment damage.
Disconnect and lock-- out/tagout electrical power
before wiring the RTU--OPEN control ler.
!
WARNING
ADDITIONAL RTU--OPEN
INSTALLATION AND
TROUBLESHOOTING
Additional installat ion, wiring and troubleshooting
information for the RTU--OPEN Controller can be found
in the following manuals: “Controls, Start--up, Operation
and Troubleshooting Instructions,” and “RTU Open
Installation and Start--up Guide.”
50HC
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