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Robert Vail HVAC/R Evacuation Quiz June 17, 2021, 1:48 am
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Air Barrier vs. Vapor Barrier vs. Insulation
Think of it like this: It's a cold, wet, windy day. You can take an umbrella to protect you from the water alone, but that won't deal with the cold (temperature) or the wind (air convection). You can add in a light windbreaker, which will help keep the wind (convection) off. But if you also […]Read more
Changing Liquid Filter/Drier Cores Tip
This tip comes from market refrigeration and controls technician Kevin Compass. Thanks, Kevin! A little tip when changing liquid cores: If you start pumping them down, begin bypassing discharge gas into the shell to warm it up, push out the remaining liquid, and bring the shell above the dew point so that it doesn't sweat […]Read more
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I was talking about dry contacts with one of my techs, and he looked at me like I had three heads—and one of them was on fire. So, I figured it would be good to cover the difference. Basically, a “dry” contact is a switch with no shared power source or supply integral to the […]Read more