Videos

Some technicians cannot perform effective system performance checks because they don't know the ins and outs of their tools. These technicians fail to maximize their tools' potential by not knowing where to measure, how to measure, or what their tools can do. Static pressure measurements are vital for system performance checks because of static pressure's […]

(Check out Ty’s YouTube channel HERE.) Ty Branaman performs an experiment with a heater to teach the apprentices about Watt’s law in action. He connects the electric heater to an adapter that displays the voltage and amperage of the device. The apprentices multiplied the volts by the amps to yield about 913 watts. The resistance, […]

analogies for magnetism and electricity (Check out Ty’s YouTube channel HERE.) You create electricity when you send a magnet through a coil of wire. Alternatively, sending electricity through a coil of wire creates a magnet. Solenoids are prime examples of electromagnets and are quite simple to create and analyze. Motors also use electromagnetic force to […]

System Burnout We cover the basics of burnout and dive into cleanout procedures. We also look at the Emerson-Copeland Bulletin AE24-1105 for some information inside manufacturer literature.You can read that bulletin at the following link: HERE. Burnout is a type of compressor failure where there is electrical arcing. A short-circuit to ground or from winding […]

When a compressor shorts, the resistance will be low, and the electricity will move from line 1 to line 2 so quickly that it trips the breaker. Before making a hasty diagnosis, it is best practice to confirm a short by ohming out your compressor with your meter. The resistance will read much lower than […]

Compression ratio is the ratio of head pressure to suction pressure in an HVAC/R unit. Generally, compression ratios approach 2.5:1 on high-efficiency, 16+ SEER A/C systems. The highest compression ratio in A/C compressors is typically 11:1. Refrigeration compression ratios tend to be quite a bit higher (up to 26:1). To calculate a system's compression ratio, […]

To make a 10-wrap rig, you simply take one strand of wire and wrap it to make 10 individual strands in a loop. You can put an ammeter clamp anywhere on it and get a more precise amperage measurement than your meter allows by using a little bit of math. When you measure the amps […]

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