Rtu Open Control System; Sensory/Accessory Installation - Carrier 50GCQ Series Service And Maintenance Instructions

RTU OPEN CONTROL SYSTEM

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 the
user to select your protocol (and baud rate) of choice among
the 4 most popular protocols in use today: BACnet, Modbus
Johnson N2 and LonWorks
The RTU Open control is factory-mounted in the unit's main
control box, to the left of the UCB (unit control board). Factory
wiring is completed through harnesses connected to the UCB.
Field connections for RTU Open sensors will be made at the
PCB 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$er

Sensory/Accessory Installation

There are a variety of sensors and accessories available for the
RTU Open. Some of these can be factory or field installed, while
others are only field installable. The RTU Open controller may
1. Third-party trademarks and logos are property of their respective
owners.
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
i-Vu Open installations
®1 . See Fig. 51.
® 2 package.
J4
BO-1
J12
Protocol Selector *Remove
both for 0-5V
Fig. 51 — RTU Open Control Module
also require connection to a building network system or building
zoning system. All field control wiring that connects to the RTU
Open must be routed through the raceway built into the corner
post of the unit or secured to the unit control box with electrical
conduit. The unit raceway provides the UL required clearance be-
tween high and low-voltage wiring. Pass the control wires through
the hole provided in the corner post, then feed the wires through
the raceway to the RTU Open. Connect the wires to the removable
PCB connectors and then reconnect the connectors to the board.
®1 ,
IMPORTANT: Refer to the specific sensor or accessory
instructions for its proper installation and for rooftop unit
installation refer to base unit installation instructions and the
unit's wiring diagrams.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death and/or equipment damage.
Disconnect and lockout/tag-out electrical power before wiring
the RTU Open controller.
Board Power
J1
BO-2 BO-3 BO-4
J22
AO-2
GND
(2-10V)
J13
J17
J19
J20
SPT (temp input)
SPT (common)
SPT (offset input)
32
WARNING
(AO-1)
0-10VDC
J3
J2
4-20mA
J5
BO-5
J22
VAF Output
BO-6
J11
BO-6
BO-7
(H) Humidimizer
BO-8
BO-8
(Power Exhaust)
Network Comm
J14
BACnet, Modbus, or N2
(LON connection J15)
J5