Rtu Open Control System - Bryant 580J Series Installation Instructions Manual

RTU Open Control System

The RTU Open control is factory- - mounted in the 580J
unit's main control box, to the right of the CTB. See
Fig. 36. Factory wiring is completed through harnesses
connected to the CTB. Field connections for RTU Open
sensors will be made at the Phoenix connectors on the
RTU Open board. The factory- - installed RTU Open
control 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
provides optimum performance and energy efficiency. RTU
Open enables the unit to run in 100% stand- - alone control
mode or to run 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. 37)
Refer to Table 5, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
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)
both for 0-5V SPT (common)
SPT (offset input)
Fig. 37 - - RTU Open Multi- - Protocol Control Board
Fig. 36 - - 580J Control Box Component Locations
0-10VDC
J1 J2
4-20mA
J5
J22
J17
Network Comm
J14
J19
BACnet, Modbus, or N2
(LON connection J15)
28
C10643
(AO-1)
J3
J5
J11
DO-6 (H)
Dehumidification
DO-7
(Reversing Valve/High Speed Fan)
DO-8
(Power Exhaust)
C12744