ComfortSite Login

Trane ComfortSite is an extranet site designed to save you time. With your secure login, you can:

  • Order Equipment, Parts, Literature and track Order Status
  • View product literature
  • Register for Training programs
  • Complete Warranty requirements online
  • Search for specific Product Information
  • Use interactive Product Support functions
  • View and print invoices through Account Track Online
  • and More
Log In

Trane Connect

This is the login for Trane® Connect™ and other Trane® commercial applications. Trane® Connect™ is our secure, cloud-based customer portal to access your building systems to remotely monitor and manage building systems, and conduct routine maintenance.

Log In

Electrical Considerations: 50 Years of the Engineers Newsletter

March 08, 2022


When joining Trane in 2000, with a background in electrical engineering, I found the Engineers Newsletters helpful in expanding my knowledge in the HVAC realm. The content was educational, timely, and well thought out with just enough technical detail to point me in the right direction and kick start my learning. It is an honor to be an EN author myself—having now authored or co-authored three newsletters. I hope to help Trane continue this goal of concise, timely education for many years to come.

Though not a primary topic, there have been eleven past newsletters particularly focused on electrical issues. Some introduce new technologies, for example; “Brushless DC Motors: Setting a New Standard for Efficiency” and “Adjustable Frequency Fan Speed Control” (ENEWS-12_10). Most others focus on two complex and often misunderstood topics; short-circuit current rating and harmonic distortion.

Short-circuit current rating (SCCR), first discussed in 1998, has an impact on equipment design and specification and is a prime example of a general topic where widespread education is needed. Due to evolving codes, we continue to follow this topic and provide yet another update as SCCR is the focus of the March newsletter.

Electrical harmonic distortion caused by solid-state power converters such as variable frequency drives, first discussed in 1985, is another topic with broad reaching implications for the HVAC industry. As the demand for higher energy efficiency and lower peak energy from our systems and equipment increases, the need to optimize operation of motors has prompted the inclusion of more power converters (e.g., VFD and EC motors) for finely controlled variable speed operation. These power converters necessitate careful design of the electrical system as they become a higher portion of the building's power consumption. Past newsletters offer informative background of the topic and best practices to mitigate possible issues.

A hidden gem in this area is “How VFDs Affect Genset Sizing”. Often overlooked because of its title, this EN not only addresses the important issue of generator sizing with VFD loads but serves as a wonderful background on the fundamentals of how VFDs work as well as the how and why of their less than desirable effects on the electrical distribution system.

I hope that the steady flow of quality Engineers Newsletter content has been helpful to increase your knowledge and make your job a little easier. It certainly has for me!

Thanks for reading and if there are topics (new or old) that would be helpful to address in future issues, please let us know!

About the Author


Bob Coleman, Systems Development Engineer

Bob joined Trane in 2000 after receiving a Bachelor of Science degree in Electrical Engineering from the University of Kentucky and rejoined Trane in 2021 after a two-year hiatus exploring the world of building automation and energy services. Prior to joining the systems development team, Bob worked in the product engineering, technical support, and airside applications groups in Fort Smith, AR and Lexington, KY. He is currently based in Lexington.

Bob is currently involved in ASHRAE® as chair of Technical Committee 1.11 Electric Motors and Motor Control, chair of Standard 222 Standard Method of Test for Electrical Power Drive Systems, and member of Technical Committee 2.9 Ultraviolet Air and Surface Treatment.