Air is Squishy – Measuring Airflow w/ Bill Spohn
Measuring airflow is easy… measuring airflow accurately is quite a bit more difficult. In many cases when we as technicians measure airflow we are trying to get to the almighty CFM (Cubic Feet per Minute) volume measurement. You can take CFM readings fairly easily with a hood like the Testo 420 shown above, but even […]
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Start Flowing Nitrogen Sooner
My technician (and brother-in-law), Bert, made a good point today. (It's hard for me to admit it, but it's true.) When he needs to open the refrigerant circuit to make a repair, regardless of whether he is recovering or pumping down, he pulls out his nitrogen tank and his regulator. (We like the VN500 shown […]
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Short #1 – Refrigerant Circuit Basics
In this short episode we review the basics of the refrigerant circuit. Compressor, Condenser, Metering Device and Evaporator Find out more at HVACRSchool.com
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Bi-Polar Ionization and IAQ w/ Jon Bennert
Jon Bennert from Air Oasis teaches us about PCO and Bi-Polar air purification and how it works.
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Reach-In Temperature Controls
  This article is written by Christopher Stephens of JVS Refrigeration in California, with just a few additions by me (Bryan) in italics. Thanks, Chris! Reach-in refrigerators are an interesting side of our industry, often looked at as frustrating and troublesome. Since we usually see reach-ins in kitchens or convenience stores, the refrigerators are never […]
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What You Need to Know About MicroChannel
Microchannel is a coil type used in many evaporator and condenser coils. You can easily identify it by its flat tubes, and its fins appear as waves between the tubes. The technology was developed for use in the automotive industry and is used for radiators and automotive A/C condenser coils. These coils are made of […]
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Reach In Refrigeration w/ Eric Mele
A summary of reach in coolers (refrigerators), freezers and wine coolers with some mindset and technical tips
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Condensate Pump Drains
One of my techs (Jim Walch) brought another common “double trap”-style issue to my attention: techs and installers running a drain too far into a condensate pump. When you run the system drain too deep into the pump reservoir, the water level can rise high enough to cover the drain end. That can create the […]
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A Simple Piping Practice
Although there are various line lift, sizing, and trapping guidelines depending on oil and refrigerant type, there is one guideline we can all understand easily and remember to apply. This guideline is to slope suction lines towards condensing units/compressors. Keeping the suction line sloped toward the compressor, especially with long overhead lines, helps return the […]
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