Articles by Joe Marchese

Ice Breaker: High-Pressure Switches

Troubleshooting Compressor Shutdown Controls Requires Care
March 31, 2014

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. 


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Ice Breaker: How to Size Replacement Cap Tubes

Replacing Because of Restrictions
March 3, 2014

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.


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Ice Breaker: Evap. Pressure Regulators

A Look at Familiar Refrigerant Flow Control Device
February 3, 2014

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. 


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Ice Breaker: What a Tripped Oil Pressure Control Means

Avoiding Compressor Shut Down
January 6, 2014

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.


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Ice Breaker: Diagnosing Failures in Refrigeration

Determining Why a Refrigeration System Is Not Operating Properly
December 2, 2013

Sometimes we over think both the easy and hard problems, making a true system issue more difficult than it really needs to be. 


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Ice Breaker: Relief Valves 101

Safety Device Helps Protect Equipment, Workers
November 4, 2013

Relief valves are used to release abnormally high pressure inside a vessel before that pressure causes the vessel to erupt. 


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Ice Breaker: Identifying, Choosing Proper Temp Sensors

There are Differences in this Basic Tool of the Trade
October 7, 2013
Not all temperatures sensors are created equal and not all instruments and controllers use the same type of temperature sensors. So the first step in troubleshooting or replacing this type of sensor is to first recognize the type of temperature sensor being used.


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Ice Breaker: Suction Line Insulation

Elastomeric Material Means Condensation Prevention
September 2, 2013
The suction line of a refrigeration system is normally insulated with a flexible, closed-cell elastomeric material. Insulating the suction line is done to prevent condensate from developing and dripping off. It also limits the amount of heat added to the refrigerant as it travels back to the compressor.


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Ice Breaker: The Last Steps of a Service Call

Leave a Lasting Impression on Your Customers
August 5, 2013

How you handle leaving a job site is as equally important as how you handle arriving and conducting the repair or installation. 


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Ice Breaker: Transformer Sizing and Calculating VA Capacity

Joe Marchese Explains How to Size a Step-Down Transformer
July 1, 2013

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. 


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