Rtu Open Controller System - Bryant 551J*07A/G Series Installation Instructions Manual

RTU Open Controller System

The RTU Open controller is factory- - mounted in the 551J
unit's main control box (see Fig. 41), to the left of the
CTB. Factory wiring is completed through harnesses
connected to the CTB. Field connections for RTU Open
controller sensors will be made at the Phoenix connectors
on the RTU Open board. The factory- - installed RTU Open
controller includes the supply- - air temperature (SAT)
sensor. The outdoor air temperature (OAT) sensor is
included in the FIOP/accessory EconoMi$er2 package.
The RTU Open controller is an integrated component of the
Bryant rooftop unit. Its internal application programming
Lonworks
Option Card
Port
J15
Example set for
BACnet MS/TP
and 76.8K baud
(1, 2, and 4 ON)
Protocol Selector
Board Power
J4
J13
J12
J20
*Remove SPT (temp input)
SPT (common)
both for 0-5V
SPT (offset input)
Fig. 40 - - RTU Open Multi- - Protocol Controller Board
provides optimum performance and energy efficiency. The
RTU Open controller enables the unit to run in 100%
stand- - alone control mode or a Third Party Building
Automation System (BAS). On- - board DIP 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**. (See Fig. 40.)
Refer to Table 18, RTU Open Controller Inputs and
Outputs for locations of all connections to the RTU Open
controller board.
NOTE: The RTU Open controller acts as an intelligent
imbedded thermostat. A room thermostat cannot be used
with the RTU Open controller.
J1 J2
J22
J17
Network Comm
J19
BACnet, Modbus, or N2
(LON connection J15)
* BACnet is a registered trademark of ASHRAE (American Society of
Heating, Refrigerating and Air---Conditioning Engineers).
{ Modbus is a registered trademark of Schneider Electric.
** LonWorks is a registered trademark of Echelon Corporation.
38
(AO-1)
0-10VDC
J3
4-20mA
J5 J5
J11
DO-6 (H)
Dehumidification
DO-7
(Reversing Valve/High Speed Fan)
DO-8
(Power Exhaust)
J14
C12744