period three

System Configurations

notes

Any unneeded air is diverted to the return air stream, allowing individual comfort control of the spaces.

At part-load conditions, when more of the primary air bypasses the space, the mixture of previously conditioned primary air and recirculated return air cuts energy use at the cooling and heating equipment. This explains the use of the term “bypass” in the name of this system. However, due to the fan providing a constant airflow, no fan energy savings is realized at part-load conditions.

The term “changeover” refers to how this system handles the cooling and heating requirements of the building. The central air handler can provide either cooled or heated primary air to the space terminal units, and it makes this decision by periodically “polling” the spaces. Because it can only provide heating or cooling at a given time, this system is most appropriately used for smaller buildings that have a minimal number of incidences where heating is required in some spaces and cooling is simultaneously required in others.

System-Level Control Modes

▲Occupied mode

▲Unoccupied mode

▲Morning warm-up/cool-down mode

Figure 67

System-Level Control Modes

When designing a VAV system for a commercial application, three system-level control modes need to be addressed:

nOccupied mode

nUnoccupied mode

nMorning warm-up/cool-down mode

48

TRG-TRC014-EN

Page 52 Page 54
Page 53
Image 53
Trane TRG-TRC014-EN manual System-Level Control Modes, Occupied mode Unoccupied mode Morning warm-up/cool-down mode
Page 52 Page 54

TRG-TRC014-EN specifications

The Trane TRG-TRC014-EN is a comprehensive technical resource guide that serves as an essential tool for HVAC professionals and engineers looking to enhance their understanding of Trane's commercial HVAC systems. This guide provides an in-depth examination of Trane’s advanced technologies, key features, and design characteristics that position their products as industry leaders in heating, ventilation, and air conditioning.

One of the standout features of the TRG-TRC014-EN is its focus on energy efficiency. Trane continuously works on incorporating cutting-edge technologies that minimize energy consumption while maximizing performance. This includes the use of variable speed compressors and advanced control systems that adapt the HVAC operation according to real-time demand, significantly reducing energy costs for end users.

The guide also highlights Trane’s commitment to sustainable practices. The incorporation of environmentally friendly refrigerants and compliance with regulatory standards ensures that Trane units not only deliver comfort but also contribute to lower environmental impact. The guide provides detailed specifications on these refrigerants, allowing engineers to make informed decisions in line with environmental policies.

Another important aspect of the TRG-TRC014-EN is its technical information regarding system design and application. With comprehensive data on airflow, capacity calculations, and installation techniques, the guide serves as a valuable resource in the design phase of HVAC projects. This ensures that systems are optimized for performance and meet the specific needs of any given commercial space.

Additionally, the TRG-TRC014-EN addresses integration with smart building technologies. Trane units are designed to easily integrate with building management systems (BMS), enabling better monitoring and control of HVAC operations. This compatibility enhances operational efficiency and supports predictive maintenance, reducing downtime and servicing costs.

Moreover, the guide emphasizes Trane’s extensive warranty and service support. Understanding that customer satisfaction extends beyond the sale, Trane provides comprehensive service options that assure users of reliable and prompt support throughout the lifecycle of their HVAC systems.

In conclusion, the Trane TRG-TRC014-EN stands as an essential guide for HVAC professionals seeking to leverage Trane’s innovative technologies and design features. With a strong emphasis on energy efficiency, sustainability, technical accuracy, smart integration, and robust support, this guide underscores Trane's position as a leader in the HVAC industry.
Top Page Image Contents