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John Tomczyk

John Tomczyk is HVACR professor emeritus, Ferris State University, Big Rapids, Michigan, and coauthor of Refrigeration & Air Conditioning Technology, published by Cengage Learning. Contact him at tomczykjohn@gmail.com.

Articles

ARTICLES

Discharge Thermistor.

Prevent Premature Compressor Wear Due to Internal Overheating

Measuring discharge temperature provides insights into system workings

September 6, 2021

Any compressor that gets too hot or is overheated is subject to premature wear between its internal moving parts.

A technician checks the refrigerant pressure in an air conditioning condenser.

Properly Interpreting Liquid Subcooling in the Condenser

High subcooling can indicate several different problems in the system

July 26, 2021

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.

Electrical Schematic Diagram.

Improving Your Systematic Troubleshooting Skills

The symptom/cause method is a quick and efficient way to solve even the toughest service call

July 6, 2021

Systematic troubleshooting using the symptom/cause method is a quick and efficient way a service technician can solve even the toughest of service calls.

Frosted evaporator coil.

Don’t Forget to Inspect and Clean the Evaporator Coil

Make sure all air conditioning components are operating properly before summer

May 27, 2021

Summer is almost here, and as part of the seasonal commissioning process, technicians should inspect the evaporator coil and clean it if necessary.

FROSTlines - The ACHR News

Dirty Condenser May Cause Poor Airflow

Keeping coils clean will lead to better system performance

April 16, 2021

Over time, condenser coils often become plugged or fouled with dirt, grease, weeds, cottonwood fuzz, or simply layers of dust.

The latent heat of fusion for ice.

Understanding What a Cooling Ton Means

Variables will also affect the capacity of a refrigeration system

March 4, 2021

Service technicians often confuse motor horsepower (hp) with tons of refrigeration.

Refrigeration Gauge.

Refrigerant Migration Can Cause Valve Damage

An automatic pump-down system can combat migration problems

February 16, 2021

In most refrigeration and air conditioning systems, refrigerant will want to travel, or migrate, to a place where the pressure is the lowest.

This diagram shows the forces of the TXV's flexible diaphragm.

Make Sure the TXV Remote Bulb Is Properly Placed

Poor thermal contact with the suction line can cause problems

January 26, 2021

This article will explore the remote bulb and its proper placement on a system’s suction line.

John-Tomczyk

Oil-Coated Evaporator Tubes Can Cause Problems

This condition may result in a loss of capacity and poor performance

January 7, 2021

Little by little, a compressor’s lubricating oil will eventually escape the compressor’s crankcase and enter the system’s tubing.

An internal cut-away of the low ambient control valve.

Cold Weather Control of Condensing Units

Frigid conditions require low ambient controls to ensure optimal performance

November 21, 2020

Condensing units that are exposed to low ambient conditions must have some sort of low ambient control installed on them.

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