Short Cycling
By:Bryan Orr A friend of mine was telling me that a utility had the idea that they could reduce energy consumption by turning HVAC equipment on and off rapidly during times of high load. In their minds, wouldn't it be better to spread out the off time rather than keeping the system off for longer […]
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Diagnosing ECM & X13 Motors
By:Bryan Orr First, let's give proper credit. Most of the best practices and tools for diagnosing ECM and X13 motors come from Regal/Genteq and their site, thedealertoolbox.com, and their app, The Dealer Toolbelt (available on the App Store and Google Play). Your best bet is to follow the practices shown there and use their TECInspect […]
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Static Pressure, Manometers, and Magnehelics
By:Bryan Orr When you start talking airflow, it can get pretty in-depth pretty quickly. There is a big gap between what is useful for the average tech to apply every day and the whole story, so let's start with the simplest part to understand: static pressure. Static pressure is simply the force exerted in all […]
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Capacitor Testing and Replacement Procedure
By:Bryan Orr ❶ Understand What a Run Capacitor Does The run capacitor provides continuous phase-shifted current to the motor start winding, allowing the motor to run: With the design efficiency In the right direction With the appropriate torque With near “unity” power factor (power factor near 1.0) If the run capacitor is failed, the motor […]
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Why Compression Ratio Matters
By:Bryan Orr In HVAC/R, we are in the business of moving BTUs of heat, and we move BTUs via pounds of refrigerant. The more pounds we move, the more BTUs we move. In a single-stage HVAC/R compressor, the compression chamber maintains the same volume no matter the compression ratio. The thing that changes is the […]
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The HVAC/R Island of Misfit Toys
By:Bryan Orr It’s that time of year again. The tree has been decorated, cookies have been baked, festive family photos with my 10 kids have been sent out to friends, and we’ve had no shortage of service calls about “smoking” heat pumps. (Don’t worry, that’s normal.) You know how much I enjoy Christmas movies by […]
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Gratitude and Reflection
By:Bryan OrrI remember having conversations on the floor of AHR in Orlando in early 2020. There was talk of this new superbug that was causing issues in Asia. That year we had the first podcast pavilion, we had great conversations with Alex Meaney, Michael Housh, Andrew Greaves, Jim Bergmann and Rich Trethewey. Leilani and Bert […]
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Weighing Refrigerant In and Out
By:Bryan Orr If you don't use a scale every time you add or remove refrigerant, I suggest you begin doing so immediately, if not sooner. Weighing in while charging is fairly obvious, and it's useful so you can keep track of what you are using and how much to charge a customer. When you have […]
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5 Terror-Inducing HVAC/R Stories & Facts
By:Bryan Orr As the evening approaches on this All Hallow's Eve, Reformation Day, or Halloween (depending on your preference), let us take a moment to focus on some of the truly terrifying elements of our trade—because the scariest stories are TRUE. Real Ghost Stories  The year was 1921, and a wealthy family purchased a new […]
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