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Home » Authors » John Tomczyk

Articles by John Tomczyk

Evaporator Installation.

Determining the Cause of a Restricted Liquid Line

Restrictions can starve refrigeration components of refrigerant, resulting in system problems
John Tomczyk
June 28, 2022
Liquid line restrictions cause the evaporator, compressor, and condenser to be starved of refrigerant, causing performance problems in refrigeration systems.
Read More
Supermarket Cooler.

Evaporator Determines Refrigeration System Efficiency

A cold evaporator can still result in warm refrigerated space temperatures
John Tomczyk
June 8, 2022
An evaporator can be cold but inactive, causing warm refrigerated space temperatures.
Read More
Dirty Condenser.

The Importance of a Clean Condenser

A dirty coil will result in less heat transfer and poor efficiency
John Tomczyk
May 4, 2022
The condenser is the most underrated component in an air conditioning or refrigeration system.
Read More
Pipes

Oil Traps Protect the Compressor

All vapor-carrying lines in a system should have an oil trap to ensure proper oil return
John Tomczyk
April 8, 2022
Even though the circulated refrigerant is the working fluid required for cooling, lubricant or oil is needed for lubrication of the compressor’s moving mechanical parts.
Read More
Frost

Frosty Evaporator Will Prevent Correct Airflow

Compressor may also become damaged from flooding or slugging
John Tomczyk
March 23, 2022
The evaporator is one of the major components of any refrigeration or air conditioning system.
Read More
Open Freezer Door

What Should the Condensing Temperature Be?

The high side of a refrigeration system will provide valuable insights into potential problems
John Tomczyk
January 22, 2022
What happens in the condenser is a direct reflection of what is happening in the rest of the refrigeration system.
Read More
Refrigerant Cylinders.

Refrigerant Overcharge Can Result in Serious Problems

Inexperienced techs often add refrigerant before verifying the problem with a system
John Tomczyk
December 26, 2021
Inexperienced service technicians have a tendency to add refrigerant to a troubled system in order to remedy a problem. Because of this, many systems are operating with an overcharge of refrigerant.
Read More
Refrigeration and air conditioning compressors.

How to Measure Net Oil Pressure

Many larger refrigeration and air conditioning systems have oil pumps
John Tomczyk
November 24, 2021
Before servicing any refrigeration or air conditioning systems that contain an oil pump, technicians should make sure they understand the difference between net oil pressure and oil pump discharge pressure.
Read More
Liquid Line Filter Drier

How to Diagnose Partially Restricted Filter Driers

A sight glass is helpful in determining the condition of the system
John Tomczyk
October 26, 2021
Service technicians should always remember that systematic troubleshooting is the only sure way to find the actual cause of any system problem.
Read More
Air-Cooled Compressor.

Making Sense of Compressor Frost Patterns

In some refrigeration systems, heavy frost is not usually a cause for alarm
John Tomczyk
September 21, 2021
Any compressor that gets too hot or is overheated is subject to premature wear between its internal moving parts.
Read More
Previous 1 2 3 4 5 6 7 8 9 … 20 21 Next
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