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RTU Open Control System
The RTU Open control is factory--mounted in the 48HC
unit’s main control box, to the right of the CTB. See
Fig. 37. 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
Carrier 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, Carrier’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. 57.)
Refer to Table 9, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
C10811
Fig. 57 -- RTU Open Multi--Protocol Control Board
48HC