Wiring Requirements for Communicating Thermostats

BACnet networks use a daisy chain configuration. A daisy chain means that there is only one main cable and every network device is connected directly along its path.

Figure 2 illustrates two improper network configurations and the proper daisy chain configuration.

Figure 2. Incorrect and correct network configurations

BACnet MS/TP Link Wiring

BACnet MS/TP link wiring must be field-supplied and installed in compliance with the National Electric Code (NEC) and local codes.

BACnet Configuration Requirements

•Follow these configuration requirements:

•BACnet wiring must use daisy-chain configuration. Maximum length is 4,000 ft (1219 m).

•BACnet links are polarity sensitive; consistent wiring polarity must be maintained between devices.

•Limit each link to 30 controllers or 60 total controllers per Tracer SC.

BACnet Wiring Best Practices

The following wiring practices are recommended:

•Use 18 AWG, (24 pF/ft. max.), shielded, twisted pair communication wire (Trane purple wire).

•Strip no more than 2 in. (5 cm) of the outer conductor of shielded wire.

•Avoid sharing 24 Vac power between unit controllers.

•Ensure that 24 Vac power supplies are consistently grounded. If grounds are not maintained, intermittent or failed communication could result.

•Connect the shield portion of the communication wire at the first unit controller in the link.

•Use a Tracer BACnet terminator at each end of the link.

For additional best practices, see the Unit Controller Wiring Guide For the Tracer SC™ System Controller (BAS-SVN03x-EN).

BAS-SVP10A-EN

25

Page 24 Page 26
Page 25
Image 25
Trane Trane Communicating Thermostats (BACnet) Wiring Requirements for Communicating Thermostats, BACnet MS/TP Link Wiring
Page 24 Page 26

BAS-SVP10A-EN, Trane Communicating Thermostats (BACnet) specifications

The Trane BAS-SVP10A-EN is a part of the Trane Communicating Thermostats series designed to facilitate efficient and effective building temperature control in HVAC systems. These thermostats work with BACnet (Building Automation and Control Network), a widely adopted communication protocol in building automation for networked control of HVAC systems, lighting, access control, and fire systems.

One of the standout features of the Trane BAS-SVP10A-EN is its compatibility with various Trane equipment and other BACnet-compliant devices. This versatility allows for seamless integration into existing building systems, enhancing operational efficiency. The thermostat is designed to support zoning applications, offering precise temperature control to individual areas or rooms, thus significantly improving occupant comfort while also minimizing energy consumption.

The Trane communicating thermostat is built with advanced technologies that ensure optimal performance. It utilizes digital communication, enabling real-time data exchange between the thermostat and the HVAC system. This capability enhances the responsiveness of the HVAC system, allowing it to adjust more accurately to changing environmental conditions. The thermostat features an intuitive interface with a clear display, making it user-friendly for building occupants and facility managers alike.

Another important characteristic is its advanced scheduling capabilities. Users can program customized heating and cooling schedules, promoting energy savings while maintaining comfort levels. Additionally, its remote access feature allows for monitoring and control from smartphones, tablets, or computers, making it convenient for users to manage their HVAC systems from virtually anywhere.

The Trane BAS-SVP10A-EN also boasts robust diagnostic and reporting functions. It can provide feedback on system performance, enabling proactive maintenance and troubleshooting, which increases the reliability of HVAC operations. Overall, the Trane Communicating Thermostat represents a sophisticated solution for modern building management, focusing on comfort, energy efficiency, and ease of integration into existing systems. With its commitment to leveraging cutting-edge technology, Trane continues to lead in providing innovative solutions for heating, ventilation, and air conditioning needs in diverse building environments.
Top Page Image Contents