by John Krigger | Mar 31, 2022
(0.9 CEU; 55 minutes) Airflow and static pressure are directly related to one another. Measuring static pressure is considerably easier than measuring airflow. Thus, we measure static pressure differences in different parts of a forced air system. This micro...
by John Krigger | Mar 31, 2022
(0.5 CEU; 25 minutes) This 7-minute video explains the process of evaluating and servicing a typical residential HVAC system. The focus is on troubleshooting and logical progression of tasks. Find your procedure guide under the Materials tab. A short quiz will...
by John Krigger | Mar 31, 2022
(0.7 CEU; 45 minutes) Building pressures cause the infiltration of outdoor air and the exfiltration of indoor air. Unbalanced airflow between supply and return ducts can cause positive pressures in some rooms and negative pressures in others. Duct air leakage in...
by John Krigger | Mar 13, 2022
This test presents you with a wide variety of technical questions about gas heating, air conditioners, heat pumps, refrigeration systems, the refrigeration cycle, combustion venting systems, and equipment identification. This is a good test for aspiring HVAC ...
by John Krigger | Jan 21, 2022
(2.0 CEUs) This lesson discusses how to cool a home with only fans. Fans can create a wind chill effect, and they can cool the home with night air, assuming that the air outdoors is cooler than the air indoors. Here are the main topics of this lesson. Circulating...
