At, The NEWS’ Extra Edition page is home to hundreds of online-exclusive service and maintenance, technical, and business-management articles. Here are some of the best.

The Basic Refrigeration Cycle

Mechanical refrigeration is accomplished by continuously circulating, evaporating, and condensing a fixed supply of refrigerant in a closed system. This article describes and illustrates the basics of the refrigeration cycle.

Quick Facts: Superheat and Subcooling

Superheat and subcooling are two terms that every service technician should know. Here are some quick facts on what they are and why they’re important.

Troubleshooting HVACR Systems Using Superheat and Subcooling

Regardless of your experience, to troubleshoot a system it is essential that you have a solid understanding of the fundamentals of refrigeration, including the principles of superheat and subcooling. You also need to have the right tools and know-how to apply these principles to use the tool quickly and efficiently.

Understanding Solenoid Valves

Solenoid valves are highly engineered products that can be used in many diverse and unique system applications. A brief overview of the components and functional varieties of solenoid valves is provided here.

Understanding Heat Pump Sequence of Operation

In order to service and troubleshoot an air-source heat pump system, a service technician must understand the unit’s sequence of operation. This is the order of events the system undergoes to cycle itself on and off. Where the system varies from its normal sequence is a major clue to many problems.

Publication date: 6/10/2013 

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