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Refrigeration Communication Troubleshooting Using Oscilloscopes
Preventing Heat Illnesses in the BLAZING Summer Heat
What is RS-485 Communication?
A2L Dissipation Boards and Leak Sensors
Oscilloscope Systems and Settings
Iโve Done It This Way for 20 Years โ And Thatโs the Problem
Oscilloscopes 101
Estimating Made Easy with Unity Build
Buck-Boost Transformers
Symposium – What Good Techs Do Different W/ Data
Heat Recovery from Data Center w/ Jeff Staub
All About ESCO with Renee Tomlinson and MeasureQuick’s Latest Features with Jim Bergmann
Building Tools & the Trade w/ Tony G. from Fieldpiece
Symposium – Do Inverters Suck?
Recovery Pro Tips w/ Jesse from NAVAC
Symposium – What is the House Trying to Tell Me?
Don’t Die! w/ Louise from UEi
Heat Exchanger Crack Comment – Short #280
#hvac
Tech Tips:
This tech tip is the final installment in our short series on using oscilloscopes to troubleshoot communicating systems. This time, we’re focusing on troubleshooting communication issues in commercial refrigeration systems. Imagine this scenario: you’ve got a refrigeration system acting up, and the comms network, whether it’s LON or MOD-bus, seems a bit flaky. Let me […]
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This tech tip about preventing heat illnesses covers information and resources from the Cleveland Clinic, the U.S. Centers for Disease Control and Prevention (CDC), the U.S. Occupational Safety and Health Administration (OSHA), and the National Oceanic and Atmospheric Administration (NOAA). HVAC School is NOT an official OSHA training resource, and although these safety tips are […]
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This tech tip about RS-485 communication is the third installment in a four-part series about oscilloscopes. It’s a primer for the final installment about using an oscilloscope for diagnosis. I owe a special thanks to Jeremy Smith for sharing the information on Danfoss and for sparking my curiosity surrounding this type of communication. Let’s talk […]
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The HVAC industry’s ongoing shift towards eco-friendly solutions continually introduces new challenges and learning opportunities. A2L refrigerants are at the forefront of this transformation, offering a lower global warming potential (GWP) than many of the refrigerants weโve been using. A2L refrigerants are also mildly flammable, meaning they require some enhanced safety measures; one of these […]
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This is part two of our four-part series on oscilloscope fundamentals. Special thanks to Andrew Holden for his contributions. In our last tech tip on oscilloscopes, we learned about some safety basics, waveforms, and measurements. Weโre going to dive a little deeper into systems and settings on the oscilloscope in this tech tip. Systems are […]
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Every trade has its favorite phrases. One of the most common in HVAC goes something like: “Iโve been doing it this way for 20 years and never had a problem.” When you hear thatโor when you catch yourself saying itโitโs worth stopping to think. Usually, what that sentence really means is: “Iโve been doing it […]
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This tech tip is the first in a four-part series on using oscilloscopes. I’d like to give a special thanks to Andrew Holden for his contributions to this particular tech tip. When we want to measure voltage between two points, we reach for a multimeter. A multimeter can tell us the average electrical potential between […]
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Many of you may already know that our HVAC company, Kalos Services, is also a GC. We do a lot of construction projects with HVAC, plumbing, and electrical scopes of work. Estimating is a crucial part of winning those projects, and those of you who work on HVAC for new construction probably already have an […]
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HVAC systems often fail early or don’t perform well due to inconsistent power. While technicians can’t control a home’s main power supply, they can stabilize it at the system using buck-boost transformers. These devices adjust voltage up or down to meet the equipmentโs needs. As HVAC systems become more advanced, understanding buck-boost transformers will be […]
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Videos:
Podcasts:
๏ปฟ๏ปฟ Discover what separates elite HVAC technicians from average ones in this eye-opening session from the 7th Annual HVAC/R Training Symposium. Shelby Breger, co-founder of Conduit Tech, and Jim Bergmann, President of measureQuick, reveal what good HVAC techs do differently with data and how they leverage data to transform their diagnostics, commissioning, and service work. […]
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๏ปฟ๏ปฟ In this episode of the HVAC School Podcast, host Bryan sits down with Jeff Staub, Director of OEM Sales for Danfoss North America, to explore one of the most rapidly evolving frontiers in the HVAC and refrigeration world: thermal management for AI data centers. With nearly 30 years of industry experience spanning technical support, […]
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๏ปฟ๏ปฟ๏ปฟ In this short episode, the HVAC School team members talk with Jim Bergmann (measureQuick) and Renee Tomlinson (ESCO) about the latest and greatest that they brought to their booths at the 7th Annual HVACR Training Symposium. First, JD Kelly spoke with Renee about ESCO Institute’s educational offerings. ESCO offers a mix of books and […]
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๏ปฟ๏ปฟ Recorded live on the third day of the AHR Expo 2026 in Las Vegas, Nevada, this episode of HVAC School brings together host Bryan and longtime friend of the show Tony Gonzalez, Director of Training at Fieldpiece Instruments. The conversation kicks off with some light-hearted banter about trade show survival tips โ including the […]
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๏ปฟ๏ปฟ Join us for this eye-opening session from the 7th Annual HVAC/R Training Symposium featuring industry experts Roman Baugh, Jon Esquivel, and Adam Mufich as they expose the truth about inverter-driven HVAC systems. What You’ll Learn: Common Inverter Problems – Why these systems fail and how to prevent callbacks Design Mistakes – Oversized inverters acting […]
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๏ปฟ๏ปฟ Recorded live on the floor at the AHR Expo 2026, this episode of the podcast brings together host Bryan and his guest Jesse, National Training Manager at NAVAC, for a candid, high-energy conversation about professional best practices in the HVAC/R trade. The two have a long-standing friendship and professional rapport that makes the discussion […]
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๏ปฟ๏ปฟ Join Chris Hughes and Adam Mufich at the 7th Annual HVAC/R Training Symposium as they interview building scientist Tessa Murray. In this eye-opening conversation about what your house is really trying to tell you. Discover why HVAC techs need to understand building science fundamentals to truly master their craft. What You’ll Learn: The critical […]
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๏ปฟ๏ปฟ In this episode, recorded live at AHR Expo 2026, Bryan sits down with Louise from UEi Test Instruments for an in-depth conversation about one of the most underestimated dangers in the HVAC trade: carbon monoxide. Rather than treating CO as just another checkmark on a safety list, Bryan and Louise dive into the full […]
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๏ปฟ๏ปฟ In this short podcast episode, Bryan responds to a comment we received about cracked heat exchangers and how they were characterized in a recent combustion safety podcast episode. In reality, heat exchanger cracks counter the effects of the inducer motor.ย The inducer pulls air through the heat exchanger, but a crack causes the inducer […]
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