This fourth of a series of articles on CO2, after a brief review of CO2 characteristics, comparing subcritical and transcritical cycles, presents a functioning transcritical system with a hermetic CO2 compressor and discusses design considerations.
Many times technicians will have the tendency to overcharge refrigeration systems. Many symptoms for other system problems look similar, but they are not exactly like an overcharge of refrigerant.
This troubleshooting procedure is designed to increase the accuracy of your service calls for ice machines, while decreasing the time required to identify any problems.
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.
The evacuation process evicts undesirable elements from the refrigerant system. This article examines the terminology, procedures, and equipment used in the evacuation process.
Troubleshooting and servicing refrigeration and air conditioning systems can be a challenging process for entry-level or experienced technicians. Regardless of your experience, it is essential that you have a solid understanding of the fundamentals. You also need to have the right tools.
There are good reasons for purging air from your refrigeration system, operating efficiency being the main one; increased equipment lifespan is another. It’s important, however, that correct purging procedures are used.
Many service technicians often become confused when the liquid line becomes restricted in the refrigeration system. This is because the symptoms often look like an undercharge of refrigerant. This article covers a refrigeration system with a restricted liquid line after the receiver using R-134a as the refrigerant. The refrigeration system is a low temperature freezer with a receiver and a TXV.
There are four pieces to the refrigerant system diagnostic puzzle: suction pressure; high-side pressure; superheat; and subcooling. This article talks about subcooling.