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, but even a hood […]
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Static Pressure and Combustion Test Ports and Plugs
My good friend and contributor to HVAC School, Neil Comparetto, made this video showing how he creates access ports for static pressure and gas combustion analysis. As techs, we find ourselves in the tough position of needing to drill access holes to take measurements, but the drilling and sealing of the holes can sometimes create […]
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Remove “Weep” Plugs on Motors
In this 60-second tech tip video by Brad Hicks with HVAC in SC. he shows us how and why to remove the weep port plugs on a condensing fan motor. I know from experience that motors can fail prematurely when this practice isn't followed. Remember that motor orientation dictates which are removed. It (generally) the ports […]
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Refrigerant Recovery Practices
Recovery is the removal of refrigerant from a system to either store and send in for recycling or to reintroduce back into the same system. Here are some top tips – Make sure your tank is empty and evacuated to 300 microns if you plan to return the refrigerant back into the system. Never mix […]
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Splicing Wires – Bad, Good, Better, Best
There are many acceptable methods for making a wire splice and you need to consider many different factors when making a splice. Here are a few considerations. High Voltage vs. Low Voltage – If the connection is 24V or less it USUALLY has fewer NEC (National Electrical Code) rules and regulations about how the connections are […]
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A Bit of Adiabatic Air Science For Techs – FB Live Video
In this video Bryan talks about Heat (Enthalpy) Adiabatic cooling Latent and Sensible heat Evaporative Cooling Humidity Blower Off Delay
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Is Flowing Nitrogen While Brazing Really Important? – Live Video 2/4/2017
In this live video Bryan talks about Flowing Nitrogen Reasons techs give not to flow nitrogen Reasons that some cases create more carbon than others Demonstration video by Tim Bagnall
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R22 Retrofit Basics in Under 12 minutes – Live Video 2/11/17
In this video Bryan talks about Refrigerant Blends The reasons for retrofit The drop-in fallacy Oil types Oil Miscibility Temperature Glide Capacity change Refrigerants to consider R427A R438A R422D R407C & A Helpful Links Choosing the right retrofit (EPA) Honeywell Retrofit Guidelines Retrofit with R438a by “The Professor”
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Something You May Want to Consider on Every Call
There are a few important things that I suggest checking on every service call to reduce callbacks and increase customer satisfaction. One of them that often gets missed is preventing wire rub-outs. One of my area managers and experienced tech Jesse Claerbout shot a video showing the simple step he takes to prevent major damage. […]
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