Rtu Open Controller System - Bryant 549J Series Installation Instructions Manual

RTU Open Controller System

The RTU Open controller is factory- - mounted in the 549J
unit's main control box (see Fig. 44), 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 PCB connectors on
the RTU Open controller 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
3-Volt
Lithium
Battery
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
BO-1 BO-2
J13
J12
*Remove
SPT (common)
both for 0-5V
SPT (offset input)
Fig. 43 - - RTU Open Controller Multi- - Protocol Control 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. 43.)
Refer to Table 23, 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
BO-3 BO-4 BO-5
J22
AO-2
GND
(2-10V)
J17
Network Comm
J19
J20
SPT (temp input) 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.
39
(AO-1)
0-10VDC
J3
J2
4-20mA
J5
J22
VFD Output
BO-6
J11
BO-6
BO-7
(H) Dehumidification
BO-7
(Reversing Valve/High Speed Fan/Y3)
BO-8
BO-8
(Power Exhaust)
J14
J5
C14162