2
- CONTROL OVERVIEW
2.1 - Control system
Rooftop units are equipped with SmartVu Control that serves as
the user interface and configuration tool for Carrier communicating
devices. The advanced SmartVu Control comes with web
connectivity.
The units typically have fixed speed compressor but also variable
speed compressors as an option
. They have one or two
refrigerant circuits.
Smartvu is an electronic control systemto regulate units of the
following types :
■
48UC-: Gas heating, cooling only, air cooled packaged rooftop
unit
■
48UP-: Gas heating, heat pump, air cooled packaged rooftop
unit
■
48UCV: Gas heating, cooling only, air cooled packaged rooftop
unit with inverter compressor
■
48UPV: Gas heating, heat pump, air cooled packaged rooftop
unit with inverter compressor
■
50UC-: Cooling only, air cooled packaged rooftop unit
■
50UP-: Heat pump, air cooled packaged rooftop unit
■
50UCV: Cooling only, air cooled packaged rooftop unit with
inverter compressor
■
50UPV: Heat pump, air cooled packaged rooftop unit with
inverter compressor
IMPORTANT: This document may refer to optional components
and certain functions, options or accessories may not be
available for the specific unit.
2.2 - System functionalities
The system controls the start-up of the compressors needed to
maintain the desired heat exchanger entering and leaving water
temperature. It constantly manages the operation of the fans in
order to maintain the correct refrigerant pressure in each circuit
and monitors safety devices that protect the unit against failure
and guarantee its optimal functioning.
2.3 -
SmartVu control system:
■
Allows users to control the unit via the SmartVu user interface
■
Provides web connectivity technology
■
Includes the trending functionality
■ Supports Carrier Connect Services (Remote connectivity, alarm
notification, remote access, performance and operation
automatic reporting, technical advice)
■
Supports Carrier Advanced Plant System Manager for multiple
chillers/heat pumps configuration
■
Provides direct BMS integration capabilities (CCN RS485,
ModBus RS485 option, LON option, BACnet IP option)
2.4 - Operating modes
The control can operate in three independent modes:
■
Local mode:
The unit is controlled by commands from the user
interface.
■
Remote mode:
The unit is controlled by dry contacts.
■
Network mode:
The unit is controlled by network commands
(CCN or BACnet). Data communication cable is used to connect
the unit to the CCN communication bus.
■
Thermostat mode:
The unit is controlled by the start/stop and
setpoint contacts.
When the control operates autonomously (Local or Remote), it
retains all of its control capabilities but does not offer any of the
features of the Network.
CAUTION: Emergency stop! The Network emergency stop
command stops the unit regardless of its active operating type
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