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RTU Open Control System
The RTU Open controller, see Fig. 50, 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.
Fig. 50 - - RTU Open Multi- - Protocol Control Board
Fig. 51 - - 50HCQ Control Box Component Locations
The RTU Open control is factory- - mounted in the 50HCQ
unit's main control box, to the left of the CTB. See
Fig. 51. 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.
Refer to Table 7, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
27
C10811
C10024
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