Carrier SmartVu - Hardware Description; Control Boards; Power Supply to Boards; Light Emitting Diodes

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3 - HARDWARE
3.1 - Control boards
Each circuit is by default fitted with one SIOB board used tomanage all major inputs and outputs of the controller.
Options, such as IAQ or economizer, require the installation of a second SIOB and even a third one for pre-heaters for example.
Also, with humidity or variable speed compressors option for exemple, an AUX board will be needed.
All boards communicate via an internal LEN bus.
3.2 - Electrical box
The electrical box includes all boards controlling the unit and the user interface (SmartVu).
The main board continuously monitors the information received from various pressure and temperature probes and accordingly
starts the program that controls the unit.
The unit is equipped with the SmartVu user interface. The number of boards available in the electrical box depends on the number of
selected options.
3.3 - Touch panel connections
Connections are located on the bottom and the right side of the controller .
■ The control offers communication protocols such as LEN, CCN (Carrier Comfort Network), Modbus, or BACnet.
■ It is possible to enable and disable end of line resistors via the System menu (see section 5.6).
■ One Ethernet ports allow for TCP/IP communication connection.
Connections on the bottom side of the controller
3.4 - Power supply to boards
All boards are supplied from a common 24 VAC supply referred to earth.
CAUTION: Maintain correct polarity when connecting the power supply to the boards, otherwise the boards may be
damaged.
In the event of a power supply interrupt, the unit restarts automatically without the need for an external command. However, any
faults active when the supply is interrupted are saved and may in certain cases prevent a given circuit or the unit from restarting.
3.5 - Terminal block connections
3.5.1 - General description
The contacts below are available at the user terminal block on the SIOB board.
Depending on the user configuration, some contacts can only be used if the unit operates in remote operating type (Remote) or
thermostat operating type (TSTAT).
IMPORTANT: Rooftop inputs are voltage-free dry contacts. Connecting ther than voltage-free outputs to the rooftop
inputs will cause electrical damage.
Unit without thermostat input configuration
Description
Board
Input/Output
Connector
Remarks
Contact 1: Start/stop
SIOB1, circuit A
DI-01
J1
Used with the remote operating mode (Remote). The Room-mate
comfort controller option should be connected to this channel to be
able to start and stop the unit.