Here is another excellent article from Michael Housh, owner of Housh Home Energy and a regular contributor to HVAC School. Thanks, Michael! I thought I would go through a simple example of sizing a hydronic circulator for an application. This is a made-up scenario, but I sketched out a 20’ x 20’ square home with […]

Relays can be used for many different control applications, including controlling fans, blowers, other relays, or contactors, valves, dampers, pumps, and much more. A 90-340 is a very common, versatile relay that many techs have on their truck. So, we will use it as an example. A relay is just a remotely controlled switch that […]

  Graphic Courtesy of Danfoss During the week of 9/18/2017, Danfoss put out a lot of great information on global changes to refrigerants and their expected impact on equipment and the industry. This a quick overview of the different types of refrigerants, the reasons for the changes, and some things to watch out for. ODP […]