#refrigerant

Tech Tips:

One Way to Picture Superheat and Subcool
By:Matthew BrunerIt took me years to build a picture in my head of what superheat and subcool mean. They were these strange words that dropped out of nowhere when I entered the HVAC world, and in the midst of grappling with so many other things, I could tell they were very important. Over time, I […]
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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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Retrofitting Existing R-404A/R-507A Systems
By:Don GillisThis article was written by Don Gillis with Chemours. Thanks, Don! With the American Innovation Act (The AIM Act) in place and the reduction of the supply of hydrofluorocarbons (HFCs) in effect, the need to retrofit systems with lower global warming potential (GWP) refrigerants will become commonplace in the very near future. So, what […]
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Crankcase Heaters
By:Bryan Orr Belly band crankcase heater When I first started in the trade as an apprentice, we worked on many Trane heat pumps that used crankcase heaters. These crankcase heaters slid into the compressor sump on the big orange Tyler reciprocating compressors. They looked like the one in the picture below. It was very common […]
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Refrigerant Basics
By:Bryan Orr A refrigerant is anything we use to move heat from one place to another using the compression refrigeration circuit. However, the history of refrigerants and the different kinds is quite diverse and interesting. Have you ever noticed how your skin feels cool after you apply some rubbing alcohol to it? For a long […]
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Electronic Leak Detection
By:Bryan Orr Electronic leak detection is a critical part of any HVAC technician's common practice. Unfortunately, it is also one of the most common sources of misdiagnosis. Here are my tips to make your leak detection more successful: Use Your Senses First and Your Detector Second  Before starting to use your detector, STOP! Look for […]
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Does Refrigerant Get Old or Wear Out?
By:Bryan Orr Over the years, I have heard technicians say that refrigerant can wear out or “lose its blend” by sitting in a tank. Refrigerant does not wear out or “lose its blend”… at least not like that. What can and does happen is called “fractionation.” Refrigerant blends are composed of a mix of refrigerants […]
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What does “Saturated State” mean for Techs?
By:Bryan Orr As we often do in these tech tips, we will start with the common and more practical explanation of saturation and then move to the more technical and nerdy explanation later. When we say “at saturation” or “saturated” in the HVAC/R trade, we are generally referring to the refrigerant that is in the […]
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Refrigerant Charging Basics For Air Conditioning & Heat Pump Systems
Before I start on this one… At HVAC School, we focus on a wide range of topics. Many of them are very basic. My experience as a trainer for over 16 years has taught me that no matter what I assume others SHOULD know, it doesn't change the fact that they often do not. This […]
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Videos:

ABC’s of New A2Ls w/ Opteon
By:Bryan OrrDr. Chuck Allgood
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Setting a Refrigerant Charge by Subcool
Bryan demonstrates an in-depth tutorial on how to set a refrigerant charge by Subcool.
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Podcasts:

A2L Update With Chemours Live from AHR
By:Don GillisDr. Chuck AllgoodAdam MufichNathan Orr  Don Gillis and Dr. Chuck Allgood from Chemours join the show to discuss their new easy as “1,2,3” branding around the A2L refrigerants R454A, R454B, and R454C. They explain that A2Ls are not actually flammable like hydrocarbons; they are just mildly combustible with much lower burning velocity and […]
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What Is A2L Mitigation Going To Look Like? W/ Clifton B.
By:Bryan OrrClifton Beck  In this podcast, Bryan and Clifton discuss the upcoming transition to A2L refrigerants, like R-32 and R-454B, and what A2L mitigation is going to look like. These mildly flammable refrigerants will be used in place of R-410A for residential air conditioning systems due to an HFC phase-down driven by legislation and […]
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The 5 Readings Every Tech Must Know Well
By:Bryan Orr In this episode of HVAC School, Bryan covers the “5 pillars of refrigerant circuit diagnosis” and why they matter. They are: Superheat Subcool Suction pressure Head pressure Air temp split (delta T)   These 5 readings give you a holistic idea of the A/C system. Instead of getting hooked on checking only superheat […]
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