Bryant 581J series, Installation Instructions Manual

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24
RTU Open Controller System
The RTU Open controller is factory−mounted in the 558J
unit’s main control box (see Fig. 36), 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
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. 35.)
Refer to Table 6, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open
controller board.
J4
J2 J1
J5 J5
J22
J17
J19
J14
J11
J22
J3
J13
J12
J15
J20
Network Comm
Configurable - Input_8
24 V
A
C
Configurable - Input_5
24 V
A
C
Configurable - Input_3
24 V
A
C
Input_9 (Humidistat)
24 V
A
C
24 V
A
C
Input _8 (Enthalpy)
AO-1 (ECON)
Gnd
(OA
T
)
Gnd
(SA
T)
Input_5 (SMK) Input_4
(R)
BO-5
(Y1)
BO-4
(Y2)
BO-3
(W1)
BO-2
(W2)
BO-1
(G)
Gnd Input_3
(X)
24 V
AC IN
+24 VDC
Input_2 (CO2/RH)
Gnd
+24 VDC
Input_1 (CO2/RH)
Gnd
Board Power
(AO-1)
0-10VDC
4-20mA
BO-6
(H) Dehumidification
BO-7
(Reversing Valve/High Speed Fan/Y3)
BO-8
(Power Exhaust)
LonWorks
Option Card
Port
Example set for
BACnet MS/TP
and 76.8K baud
(1, 2, and 4 ON)
Protocol Selector SPT (temp input) BACnet, Modbus, or N2
(LON connection J15)
SPT (common)
SPT (offset input)
*Remove
both for 0-5V
AO-2
GND
(2-10V)
3-Volt
Lithium
Battery
BO-1 BO-2 BO-3 BO-4 BO-5
BO-6
BO-7
BO-8
VFD Output
C14162
Fig. 35 − RTU Open Multi−Protocol Controller Board
* 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.
581J