Bryant PURON 581J User Manual download pdf (Page 23)

RTU Open Control System

The RTU Open control is factory--mounted in the

48DC*D unit’s main control box, to the left of the CTB.

See Fig. 35. 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, Bryant’s I--Vu Open network, 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. 34.)

Refer to Table 3, RTU Open Controller Inputs and Outputs

for locations of all connections to the RTU Open board.

C10811

Fig. 34 -- RTU Open Multi--Protocol Control Board

581J

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Bryant PURON 581J User Manual Page 23