Educators love lockout relays, and we also love pretending you will still see them out in the field all the time. Sometimes, I have to look myself in the mirror in the morning and sadly repeat, “Lockout relays are dead.” I have to say it several times before the reality sinks in. Before I get […]

Airflow, airflow, airflow… When we set up and commission comfort cooling and heating systems, we need to pay more attention to airflow before worrying about the fancy controls or the refrigerant circuit. So, as a thought exercise, let's consider a typical 2-ton, straight cool, TXV residential system and think through what happens when we alter […]

This article is part 5 of a 5-part series on troubleshooting by Senior Refrigeration and HVAC tech Jeremy Smith. This step might be the most challenging part of troubleshooting. We've got a “Most Likely candidate” for the trouble, but we don't know for certain that's what is wrong. So, we have to combine our customer […]