When responding to a refrigeration service call at a supermarket, the refrigeration technician immediately plays "problem percentages" upon entering the store. Most refrigeration equipment breakdowns are repeat problems to some degree. Playing the percentages when responding to a service call enables the technician to get to the root source of a problem as quickly as possible to prevent perishable product loss.
The purpose of this article is to cover the higher percentage problems and repair procedures of thermostatic expansion valves (TEVs or TXVs) in supermarket applications.