Arkansas HVACR NewsMagazine January 2021

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from each of the three phases to one another and find the average (add all three and divide by three). Then compare the reading that furthest from the average and find the % of deviation. For most of you I know that sounds like a giant pain so we made this easy calculator for you. The US Department of Energy recommends that the voltage imbalance be no more than 1% while other industry sources say up to 4% is acceptable. In general, you will want to make SURE the imbalance is below 4% and work to rectify anything over 1%. The same thing is true of the current. Because three-phase motors have windings with the same resistance they should also draw the same current while running. Any major variation should be investigated by double-checking the voltage imbalance and checking the resistance of each winding. 3- phase motors don’t require run or start capacitors as having 3 phases solves all those issues. They may be part start or use other “soft” starting strategies and there may be capacitors used for power factor correction but neither of these are the same as the good old single- phase run capacitor… so that’s a plus. No Capacitors

There is a lot more to know but this is just an introduction on the basics I don’t want you to miss.

— Bryan Bryan Orr, Bryan Orr is the Co-founder of Kalos Services Inc. a Multi- Discipline HVAC/R

Contracting Company in Central Florida as well as the creator and founder of HVAC School podcast, YouTube and Website Need to Save Money and Get Great Service? Now may be the best time to review your commercial insurance: General Liability, Workers Compensation, Vehicle, Building, etc.

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