For maximum efficiency, a bank of compressors should be connected to evaporators operating at similar temperatures. From an operational standpoint, cases of different evaporating temperatures can be connected to the rack; however, this causes a substantial energy loss.
Refrigeration technicians need to use extreme care when working with torches during the brazing and soldering process. The flames of a torch can easily reach 3,000°F. At this temperature, serious damage can be the result of misuse and carelessness.
High-pressure switches are designed to shut down a compressor if the system’s high pressure rises above an unsafe level, not allowing the compressor to restart until the pressure returns to a safe level.
One field problem frequently encountered with this type of metering device is that it can become plugged with system debris, causing a restriction. When this happens, the cap tube will typically need to be replaced.
Joe Marchese explains the refrigerant flow control device, which prevents the refrigerant pressure in an evaporator from operating below a minimum value, and discusses how to select the right one for the job.
Any time an oil pressure control shuts down a compressor, the cause of the shutdown must be identified. The tripped control is a warning of another existing problem. Simply resetting the control will not solve the problem.