26
RTU Open Control System
The RTU Open control is fac tory --mounted in the 582J
unit’s main control box, to the left of the CT B. See
Fig. 39 (or Fig. 40). Factory wiring is completed through
harnesses connected to the CTB. Field connections for
RTU Open sensors wil l be made at the Phoenix connectors
on the RTU Open board. The fact ory--installe d RTU Open
control include s the supply--air temperat ure (SAT) sensor.
The out door air temperature (OAT) sensor is included i n
the FIOP/accessory EconoMi$er
R
2 package.
The RTU Open controller is an integrated component of the
Bryan t roof top unit. Its internal application programmin g
prov id es optimu m perfor man ce and energ y ef ficien cy. RTU
Open enables the unit to run in 100% stand--alone control
mode or a Third Party Building A utomation S ystem (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. 38.)
Refer to Table 6, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
J4
J2J1
J5 J5
J22
J17
J19
J14
J11
J22
J3
J13
J12
J15
J20
Network Comm
Configurable - Input_8
24 VAC
Configurable - Input_5
24 VAC
Configurable - Input_3
24 VAC
Input_9 (Humidistat)
24 VAC
24 VAC
Input _8 (Enthalpy)
AO-1 (ECON)
Gnd
(OAT)
Gnd
(SAT)
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 VAC 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. 38 -- RTU Open Multi--Protocol Control Board
582J
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