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John Tomczyk

John Tomczyk

Contributing Columnist at The ACHR News

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34
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Location
United States
Languages
  • English
Covering topics
  • Construction

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Recent Articles

achrnews.com

Dealing With an Inefficient Refrigeration Compressor

Refrigeration service technicians often run service calls in which they find a compressor with a higher-than-normal suction pressure along with a lower-than-normal head pressure. Many times, the refrigeration equipment is still running, but the product temperature is too warm, which causes product quality and safety to suffer.
about 9 years ago
achrnews.com

Operating and Troubleshooting Potential or Voltage Relays

Potential relays are commonly found on many smaller, single-phase, capacitor-start, capacitor-run motors in the HVACR industry.
over 8 years ago
achrnews.com

Compressor Overheating is One of the Most Serious Field Problems

Refrigeration systems are made up of major components in series with one another (see Figure 1). As most of us are well aware, the major components are the compressor, discharge line, condenser, liquid line, metering device, evaporator, and suction line.
almost 7 years ago
achrnews.com

Don’t Confuse a Frosted Evaporator Coil With Refrigerant Overcharge

Technicians often confuse symptoms of a refrigeration system that has a frosted evaporator coil with a system that is overcharged with refrigerant.
over 6 years ago
achrnews.com

Dirty Air Filters Can Cause Serious Air Conditioning System Problem...

One important but often overlooked piece of equipment is the air filter, which protects the evaporator from dirt and lint.
about 6 years ago
achrnews.com

Don’t Mistake a Restricted Liquid Line for an Overcharge

Distinguishing between a restricted liquid line and a system overcharge in a commercial refrigeration system is very important for service technicians.
almost 6 years ago
achrnews.com

Make Sure the TXV Remote Bulb Is Properly Placed

This article will explore the remote bulb and its proper placement on a system’s suction line.
over 5 years ago
achrnews.com

Properly Interpreting Liquid Subcooling in the Condenser - ACHR NEWS

This article will compare subcooling amounts in a refrigeration system for three scenarios: an overcharge of refrigerant, a dirty condenser, and air in the system.
about 5 years ago
achrnews.com

Making Sense of Compressor Frost Patterns

Any compressor that gets too hot or is overheated is subject to premature wear between its internal moving parts.
about 5 years ago
achrnews.com

Frosty Evaporator Will Prevent Correct Airflow | 2022-03-23 - ACHR ...

The evaporator is one of the major components of any refrigeration or air conditioning system.
over 4 years ago
achrnews.com

The Definitive Guide to Temperature Glide - ACHR NEWS

The HVACR industry will soon be using low-GWP refrigerant blends, some of which have a temperature glide when evaporating and condensing. As these refrigerant blends change phase, there’s a change in their composition, which technicians must be able to calculate while in the field.
almost 4 years ago