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Using Volts and Ohms in Diagnosis
We look at voltage and resistance, specifically using a voltmeter and an ohmmeter for diagnosis as well as a discussion of voltage drop.
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Uncommon Start and Run
I walked into my first real job interview in the HVAC trade. The manager was a guy named Ernie, and he walked me out to the warehouse. Quick warning: guys named Ernie are tough. Don't mess with a dude named Ernie. He walked up to a box, snatched a pen out of his shirt pocket, […]Read more
HVAC/R Brazing Indicators
In brazing and soldering tubing, we have a few things we need to accomplish to make a proper connection: We can't overheat the joint until it overheats the base metal or the flux where applicable. We must bring the entire joint above the melting temperature of the brazing alloy. Draw the alloy deep into the […]Read more
The Friction Rate Chart (and What it Means)
A lot of proper duct design comes down to an understanding of available static pressure and friction rate. We've covered this topic several times on this site and the podcast, but I wanted to focus on this ACCA chart specifically (shown above). ASP The horizontal axis is available static pressure or ASP, and it's indicated […]Read more