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Home » Keywords » The Professor

Items Tagged with 'The Professor'

ARTICLES

filter drier position

Inside Filter Driers

These valuable components keep systems clean but can become restricted themselves
Headshot tomczyk john
John Tomczyk
February 6, 2017
One Comment
Filter driers are designed to remove foreign materials, such as moisture, dirt, sandpaper grit, soldering flux, small solder beads, and acid from a refrigeration or air conditioning system. However, filter driers are notorious for becoming restricted from moisture, sludge, dirt, or oil that has entered the system from a poor service practice or extreme operating conditions.
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Tomczyk-John

The Professor: The Perils of Overcharging

Too much refrigerant can cause a number of system issues
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John Tomczyk
December 5, 2016
No Comments

A closer look at a refrigeration system with an overcharge of refrigerant. 


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Figure 1: A system refrigerant undercharge caused these two parallel evaporators to freeze.

The Professor: More Troubleshooting Tips for Spring Tuneups

Properly diagnosing the symptoms is what sets professional technicians apart
Headshot tomczyk john
John Tomczyk
April 11, 2016
No Comments

Diagnosing an air conditioning system isn’t easy. A service technician must be a trained professional to diagnose a system efficiently and correctly — no longer can a tech rely on rules of thumb for coil temperatures or pressures. 


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Table 1

The Professor: Understanding Compressor Amperage Curves

Table-style charts are easy to read and provide valuable information about system function
Headshot tomczyk john
John Tomczyk
February 1, 2016
No Comments

Compressor performance curves can provide a service technician with the Btu pumping rate (capacity), mass flow rates, operating amperage, and operating wattage of a compressor when the suction pressure and head pressure are known for the system. 


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John Tomczyk

The Professor: The Importance of a Refrigeration System’s Operating Pressures

Calculating and analyzing compression ratios can aid system troubleshooting
Headshot tomczyk john
John Tomczyk
January 11, 2016
No Comments

A refrigeration system’s compression or pressure ratio is defined as the absolute discharge pressure divided by the absolute suction pressure. Calculating this ratio can be a big help when it comes to troubleshooting a system.


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John Tomczyk

The Professor: Calculating Net Temperature Glide

Simple calculations account for system pressure drop
Headshot tomczyk john
John Tomczyk
November 2, 2015
No Comments

Last month’s article covered a 400-series refrigerant blend’s total temperature glide, effective temperature glide, fractionation, superheat, subcooling, and average evaporator and condensing temperatures using a pressure/temperature chart. This article deals with system pressure drops and net temperature glide in a refrigeration and/or air conditioning system.


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John Tomczyk

The Professor: The Correlation Between Refrigerant Blends and Temperature Glide

Composition of the liquid and vapor phases differ due to phase changes
Headshot tomczyk john
John Tomczyk
October 5, 2015
No Comments

System design, performance, and service conditions must be evaluated when retrofitting with a zeotropic or near-azeotropic refrigerant blend. Always follow the refrigerant manufacturer’s retrofit guidelines before retrofitting with any refrigerant, or system performance could be affected and/or injury may occur.


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FIGURE 1: Variable frequency drives (VFDs) convert a motorâ??s ac input to dc to a simulated ac signal at varying frequencies.

The Professor: Controlling Motor Speed with VFDs

Benefits include improved comfort and energy efficiency
Headshot tomczyk john
John Tomczyk
August 31, 2015
No Comments

Using variable frequency drives (VFDs) to control the speed of a compressor can provide improved occupant comfort and quieter operation in air conditioning and heat pump applications. Always consult with the specific compressor manufacturer before using a VFD controller on any compressor.


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FIGURE 1: An evaporator in a walk-in cooler has frost blocking much of the airflow from entering the coil.

The Professor: Foiling Frosted Evaporator Coils

Reduced airflow over the coil can cause a multitude of woes
Headshot tomczyk john
John Tomczyk
August 3, 2015
No Comments

Technicians should make a list of the causes that could be blamed for this failure and, once the system is up and running, eliminate them, one by one. 


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Symptoms of Air in a Refrigeration System

The Professor: Symptoms of Air in a Refrigeration System

Air May Cause a Reduction in Condensing Surface Area and High Head Pressures
Headshot tomczyk john
John Tomczyk
June 1, 2015
No Comments

If air gets into a system, it will collect in the top of the condenser and be trapped. Here are eight symptoms of air in a refrigeration system.


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More Articles Tagged with 'The Professor'
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