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RTU Open Control System
The RTU Open control is factory- - mounted in the 50KCQ
unit's main control box, to the left of the CTB. See
Fig. 52. 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)
Recommended for all
Protocol Selector
i-Vu Open installations
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. 51 - - RTU Open Multi- - Protocol Control Board
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
R
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. 51.)
Refer to Table 8, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open board.
J1
J2
J5
BO-4
BO-5
J22
BO-6
AO-2
GND
(2-10V)
BO-7
BO-8
J17
Network Comm
J14
J19
BACnet, Modbus, or N2
(LON connection J15)
28
(AO-1)
0-10VDC
J3
4-20mA
J5
J22
VFD Output
J11
BO-6
(H) Humidimizer
BO-7
(Reversing Valve/High Speed Fan/Y3)
BO-8
(Power Exhaust)
C14129
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