Carrier 50TCQD Specifications download pdf (Page 36)

RTU--OPEN CONTROL SYSTEM

RTU--Open Controller

The RTU--OPEN controller is an integra ted 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, Carri er’s I--Vu Open network,

or a Third Party Building Automat ion 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. 50.

Carrier’s diagnostic display tools such as Field Assista nt

BACview6 Handheld or Virtual BACview can be used

with the RTU--OPEN controller. Access is available via a

5--pin J12 access port.

SENSORY/ACCESSOR Y 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 controlle r can also require connection to a

building network system or building zoning system. All

field control wiring that connec ts to the RTU-OPEN must

be routed through the raceway built into the c orner post of

the uni t or secured to the unit cont rol box with electrical

conduit. The unit raceway provides the UL required

clearance between high and low-voltage wiring. Pass the

control wires through the hole provided in the corner post,

then feed the wires thorough the raceway to the

RTU-OPEN. Connect the wires to the removable Phoenix

connectors and then reconnect the connectors to the board.

See Fig. 50.

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.

ELECTRIC AL SHOCK HAZAR D

Failure to follow this warning could result in personal

injury, death and/or equipment damage.

Dis co nn ect all electrical power to the unit and us e

appropriate Lock--out/Tagout procedures before wiring

the RTU--OPEN controller.

WARNING

ADDITIONAL RTU--OPEN INSTALLATION

AND TROUBLESHOOTING

Refer to the following manuals: “Controls, Start--up,

Operation and Troubleshooting Instructions,” and “RTU

Open Installation and Start--up Guide” for additional

installation, wiring and troubleshooting information for

the RTU--OPEN Controller. Have a copy of thi s manual

available at unit start--up.

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Carrier 50TCQD Specifications Page 36

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