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RTU Open Control System
The RTU Open control is factory- - mounted in the 581J*14
unit's main control box, to the left of the CTB. See
Fig. 47 (or Fig. 48). 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.
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
BO-3
J13
J12
J20
*Remove
SPT (temp input)
both for 0-5V
SPT (common)
SPT (offset input)
Fig. 46 - - RTU Open Multi- - Protocol Control Board
The RTU Open controller, see Fig. 46, provides expanded
stand- - alone operation of the HVAC system plus
connection and control through communication with
several Building Automation Systems (BAS) through
popular third- - party network systems. The available
network systems are BACnet MP/TP, Modbus and
Johnson J2. Communication with LonWorks is also
possible by adding an accessory interface card to the RTU
Open. Selection of the communication protocol and baud
rate are made at on- - board DIP switches.
Refer to Table 5, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
J1
J2
J5
BO-4
BO-5
J22
AO-2
BO-6
GND
(2-10V)
BO-7
BO-8
J17
Network Comm
J14
J19
BACnet, Modbus, or N2
(LON connection J15)
25
(AO-1)
0-10VDC
J3
4-20mA
J5
J22
VFD Output
J11
BO-6
(H) Dehumidification
BO-7
(Reversing Valve/High Speed Fan/Y3)
BO-8
(Power Exhaust)
C14162
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