Your Support System

Whether you're looking for a quick answer over the phone, or a resource to independently learn more about VFDs, we give you the knowledge you need to make the best decision for your building.

Guaranteeing a Smooth VFD Start-Up

Because of the custom nature of VFDs, we send a factory-certified technician to every VFD job to handle all set-up, answer any questions, and put your mind at ease.

There's a reason that out of hundreds of start-ups (the most in the industry) the AHJ always accepts a Master Variable Speed Controller.

VFD Knowledge at Your Fingertips / Intricate VFD Knowledge

As the inventor of Variable Speed Controllers, Master's technical understanding of building applications and startups is unmatched - and we're committed to creating the finest VFD educational materials in the world.

Check out our curated YouTube page for building design FAQs and Tutorials, download our Common VFD Applications one-pager PDF, or real-numbers Case Study that breaks down everything you need to know from concept to budgeting.

Or better yet - call us with your specific application - William loves to talk 'Engineer'!

VFDs Deserve On-Site Support

Imagine: it's start-up day and you're staring at the variable speed controller, trying to figure out the settings. You're calling support, but it's not helping. And as you look around, everyone's staring too - at you.

Master NEVER puts you in this position, and we know how critical that time is - which is why our factory certified experts are in the field fine tuning the controller exactly for your building.

What Customers are Saying

Long-lasting relationships are built on trust - so what do engineers, OEMs and Pump agents have to say after working with Master for years?