An iced evaporator is a common problem encountered by technicians servicing medium-temperature refrigeration systems. A visual inspection of the coil will show this obvious problem. Most technicians will install their low-side service gauge, find the running pressure to be lower than normal, and conclude the system has a low refrigerant charge. However, an iced evaporator can be caused by a totally different system issue.
Thermostatic expansion valves (TXVs) come in many different shapes and sizes. Although they all are designed to control the superheat value of the refrigerant leaving an evaporator, there are some differences among TXVs that either enhance their operation or slightly change how they operate.
Equipment placement is an important consideration for the overall success of a walk-in cooler or freezer installation. The location of the condensing unit and evaporator must be evaluated thoroughly. Improper placement can lead to excessive installation costs as well as system performance issues.
To prevent unnecessary return visits (aka callbacks) for your company or future issues for your customers, here are some helpful items to remember when completing a repair. It can be easy to overlook some of these items, but taking the extra time to complete them before leaving the call can pay off in the long run.
Not understanding how some electronic controls operate and control a system can lead to misdiagnosing a system problem and costly repairs. It is best never to assume, but rather take the time to do some research and find out exactly how they operate. Guessing is rarely good and generally will lead to a misdiagnosis and cause a tech to replace the wrong part or component.
Being a valuable employee means being someone a service contractor can rely on each day to give an honest day’s work for an honest day’s pay. It also means an individual should provide his or her talents and skills to the company and its customers with integrity and honesty.
As heat energy is removed from a substance, its molecular activity will decrease; as heat energy is added, its molecular activity will increase. The intensity of this molecular activity affects the temperature of the substance.
The information is out in cyberspace when you need it, but you have to be willing to go get it. Becoming proficient in finding information when you need it can save you time and frustration on many jobs.