RTU Open Control System
The RTU Open control is factory-mounted in the 50TC
unit's main control box, to the left of the CTB. See
Fig. 58 (or Fig. 59). 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 8, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
J3
O O O
_- o o o
_: _5"_ _5"_ _5"_
i _ _ _
0_ 0 o> 0 o_ 0 co
J5
J22
VFD Output
3-Volt
Lithium
Battery
Jll
_] BO-6
(H) Humidimizer
BOW
(Reversing Valve/HighSpeed 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)
Recommended for all
i-Vu Open installations
Protocol Selector
*Remove SPT (temp input) BACnet, Modbus, or N2
both for 0-5V SPT (common) (LON connection J15)
SPT (offset input)
Fig. 57 - RTU Open Multi-Protocol Control Board
C14129
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