Articles by John Tomczyk

The Professor’s Lesson on HFO, HC Refrigerants

Next-gen Fluids Each Offer Unique Traits, Characteristics

HFO refrigerants are actually unsaturated HFC refrigerants and are widely recognized as the next generation of refrigerants because of their environmental friendliness, cost-effectiveness, and great energy efficiencies.


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The Professor: Eliminating Unwanted System Vapors

The Benefits of Pulling a Vacuum

The main reason for pulling a vacuum on a system is to rid it of unwanted gases, mainly air and water vapor. 


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The Professor: Ice Machine Control Schemes

Often, a simple control scheme using a microprocessor can allow manufacturers to use lower starting torque compressors without the use of a hard start kit to operate their ice machines. 


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The Professor: A Recap on Oil Traps

Functions, Dealing with Oil Reservoirs

The function of an oil reservoir, commonly known as an oil trap, is to prevent large oil slugs from forming. This is accomplished by trapping a small amount of oil in the reservoir or trap and gradually returning it to the compressor.


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The Professor: Defining the Impact of Frosted Compressor Head

What Frost on a Compressor Head Is — and What it Isn’t

All frost means is the suction line or compressor is below freezing, and the moisture in the air has reached its dew point temperature and condensed. 


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The Professor: Oil Pumps and Net Oil Pressure

Understanding the Differences is Key for Successful Servicing

Often, compressors in the refrigeration and air conditioning fields have forced oiling systems. Here is a look at some of those oil pumps.


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The Professor: Don’t Forget About the Oil Check Valve

Dealing With Startup and System Problems

An overview of the oil check valve, which will only let oil pass from the compressor’s motor barrel to its crankcase.


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The Professor: Troubleshooting Using Compressor Discharge Temp

Checking Over an Often Overlooked Aspect of Servicing

The compressor’s discharge line temperature is important because it is an indication of the amount of heat absorbed in the evaporator and suction line and any heat of compression generated by the compression process.


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The Professor: Crankcase Heaters

Coping With Refrigerant Migration

Migration of refrigerant to the compressor’s crankcase during an off cycle is a serious problem, as significant compressor damage can occur if the problem is not remedied. 


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The Professor: Understanding, Avoiding Transformer Burnouts

Solving Low-Voltage Power-Consuming Faults

This column will try to explain the voltages associated with the high or wild leg coming from the secondary of a Delta service transformer. 


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Scenes from the 2014 World Energy Engineering Congress in Washington, D.C.

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NEWSMakers: Andy Heinze

Andy Heinze, distribution channel development manager, Sporlan Division of Parker Hannifin, discusses Sporlan's new refrigeration system training center. Posted Dec. 11.

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