Catalogue

22 RLC-PRC042D-EN
Controls
Tracer SC
The Tracer SC ™system controller acts as the central coordinator for all individual equipment
devices on a Tracer building automation system. The Tracer SC scans all unit controllers to update
information and coordinate building control, including building subsystems such as VAV and
chiller water systems. With this system option, the full breadth of Trane’s HVAC and controls
experience are applied to offer solutions to many facility issues. The LAN allows building operators
to manage these varied components as one system from any personal computer with web access.
The benefits of this system are:
• Improved usability with automatic data collection, enhanced data logging, easier to create
graphics, simpler navigation, pre-programmed scheduling, reporting, and alarm logs.
• Flexible technology allows for system sizes from 30-120 unit controllers with any combination
of LonTalk or BACnet unit controllers.
• LEED certification through site commissioning report, energy data collection measurement,
optimizing energy performance, and maintaining indoor air quality.
Energy savings programs include: fan pressure optimization, ventilation reset, and chiller plant
control (adds and subtracts chillers to meet cooling loads).
Building Automation and Chiller Plant Control
The UC800 controller can communicate with Trane Tracer SC and Tracer ES building automation
systems, which include pre-engineered and flexible control for chiller plants. These building
automation systems can control the operation of the complete installation: chillers, pumps,
isolating valves, air handlers, and terminal units. Trane can undertake full responsibility for
optimized automation and energy management for the entire chiller plant. The main functions are:
• Chiller sequencing: equalizes the number of running hours of the chillers. Different
control strategies are available depending on the configuration of the installation.
• Control of the auxiliaries: includes input/output modules to control the operation of the
various auxiliary equipment (water pumps, valves, etc.)
• Time-of-day scheduling: allows the end user to define the occupancy period, for example:
time of the day, holiday periods and exception schedules.
• Optimization of the installation start/stop time: based on the programmed schedule
of occupancy and the historical temperature records. Tracer SC calculates the optimal start/
stop time of the installation to get the best compromise between energy savings and
comfort of the occupants.
• Soft loading: the soft loading function minimizes the number of chillers that are operated
to satisfy a large chilled-water-loop pull down, thus preventing an overshoot of the actual
capacity required. Unnecessary starts are avoided and the peak current demand is lowered.
• Communication capabilities: local, through a PC workstation keyboard. Tracer SC can be
programmed to send messages to other local or remote workstations and or a pager in the
following cases:
• Analog parameter exceeding a programmed value
• Maintenance warning
• Component failure alarm
• Critical alarm messages. In this latter case, the message is displayed until the operator
acknowledges the receipt of the information. From the remote station it is also possible
to access and modify the chiller plants control parameters.
• Remote communication through a modem: as an option, a modem can be connected
to communicate the plant operation parameters through voice grade phone lines.