William Then Basic Refrigerant Circuit Course June 30, 2021, 2:23 pm

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On an energized, intact circuit, you will read voltage across an OPEN switch, not across a CLOSED switch, when testing with a voltmeter. Both sides of a closed switch are electrically identical (or at least very close). Therefore, there should be no movement of electrons between the leads of your voltmeter. I have seen many […]
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Sight Glass/ Moisture Indicator
Often in commercial HVAC and refrigeration, you will either find or install sight glass/moisture indicators. The sight glass portion is simple; it's just there to show if the liquid line has a full line of liquid or if it has bubbles, which shows it's a liquid/vapor mix. A clear sight glass on a running system […]
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Imagine a glass of ice sitting on a table. Now, imagine you place a lid on the glass so that all the water and ice are contained in the glass. If the ice and water are well mixed, the water and ice will both be at 32°F because the ice is slowly changing state from […]
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