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Articles by Joe Marchese
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.
Sometimes we over think both the easy and hard problems, making a true system issue more difficult than it really needs to be.
Relief valves are used to release abnormally high pressure inside a vessel before that pressure causes the vessel to erupt.
How you handle leaving a job site is as equally important as how you handle arriving and conducting the repair or installation.
A popular electrical component used on many control circuits is the step-down transformer. It is the power source for a separate lower-voltage circuit which typically controls the operation of a system.