Unlike many trades, refrigeration is uniquely challenging and interesting. The thing that makes this such a challenge is the fact that the process takes place out of sight. Solving refrigeration problems takes on a kind of nerdy "who-done-it" process. You can't see with your eyes what is going on, so you have to rely on test instruments, reference data, symptoms, and a "solid base" understanding of refrigeration theory to be able to troubleshoot problems.
I've seen valuable refrigeration equipment destroyed because so-called "technicians" didn't know what they were doing. I've also seen HVAC technicians condemn perfectly good equipment because they didn't have that "solid base" understanding of refrigeration that would have allowed them to find the real problem.
Many successful refrigeration technicians mentally put themselves into the process. They start to think like a molecule of refrigerant. They visualize themselves racing through the various circuits of a refrigeration system, picking up heat energy here, giving off heat energy there, changing from a liquid to a gas, and visa-versa. They compare what is happening with what should be happening. It's this "think like a molecule of refrigerant" that allows them to solve the problems that others can't.
We teach a course that consists of two classes, the first is called "Refrigeration For AC Systems", the second is called "Refrigeration for Heat Pumps". Both are "Solid Base" fundamentals classes that are loaded with useful information. For the duration of each class, we hammer home refrigeration theory until every person starts thinking like that molecule of refrigerant. We cover every nook and cranny of the typical air conditioner and heat pump until we know the systems inside and out. The meaning of terms like saturation, super heat, sub cooling, volumetric efficiency, enthalpy, slugging, fixed bore metering devices, thermal expansion valves, reversing valves, check valves, pressure drops, flash gas, and why volumetric capacity of the evaporator coil in a heat pump is so important will become crystal clear.
This is not an easy course, and it requires a lot to understand this material. For those who think they can absorb this technology.... welcome, we look forward to having another high quality technician in the field.
The "Refrigeration For AC & Heat Pump Systems" courses consist of two classes each running for four hours.