Shane King is a building automation applications engineer for Yaskawa America Inc. He is a 1999 graduate of Lake Superior State University (BSEE) and has 19 years of experience in the drives industry.

In HVAC VFDs, Is 2-Contactor Bypass Really Better than 3-Contactor Bypass?

Both are safe and reliable, and neither is superior or inferior to the other

Shane King

February 20, 2019

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Since as early as the 1990s, there have been questions, discussions, and application notes on the topic of using a 2-contactor bypass or 3-contactor bypass with variable frequency drive (VFD) configurations.

Engineered Systems Magazine

2019 July

Engineered Systems magazine’s July 2019 issue examines the meticulous challenges involved with designing a central steam plant, why well-maintained central plants are facilities’ lifeblood, how radiant heated and cooled classrooms are evolving in educational settings, the role of VRF on utility bills, and much more.

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