Articles by John Tomczyk

The Professor: Leak Checking a Water-Cooled Condenser

Locating Refrigeration Cycle Leaks May Be Easier Than You Think
June 3, 2013

When a refrigeration system has lost most of its refrigerant charge in a short period of time, the leak is probably significant and should be easy to find.


Read More

The Professor: Three-Phase Motor Voltage Unbalance

Troubleshooting an Overheating Compressor
May 6, 2013

Compressor overheating is usually caused from high compression ratios. High compression ratios can be caused from a combination of high condensing pressures (temperatures) and low suction (evaporating) pressures.


Read More

The Professor: Controlling Evaporator, Defrost Efficiency

April 1, 2013

The evaporator is a major component in the refrigeration system, and an efficient evaporator plays a key role in saving energy. 


Read More

The Professor: Partially Restricted Filter Driers

March 4, 2013

We are going to look at issues related to a partially restricted filter/drier. For this purpose I have included a service checklist as well as a number of illustrations.


Read More

The Professor: Compressor Overheating

February 11, 2013

Compressor overheating is often referred to as the HVACR industry’s most serious field problem.


Read More

The Professor: Compressor Superheated Discharge Temps

January 14, 2013
The compressor’s superheated discharge temperature can tell the service technician what is going on inside a refrigeration or air conditioning system. The compressor’s discharge temperature is a reflection of the hottest part of a refrigeration system, and there are limits as to how hot a discharge temperature should be.


Read More

The Professor: Superheat Amounts and Total Superheat

December 3, 2012
There will always be a time when the evaporator sees a light load and the TXV may lose control of its evaporator superheat due to limitations of the valve and to system instability. What do you do then?


Read More

The Professor: Superheat

November 12, 2012
Superheat is probably the most talked about yet misunderstood technical term used by service technicians in the field. Superheat is a measured value. What can be done with it?


Read More

The Professor: Suction Line Accumulators

October 1, 2012
There are times when low evaporator heat loads, just ended defrost periods, failing or misadjusted mechanical valves, or simply lack of system maintenance can cause compressor floodback. If there is no way to prevent these periods of liquid floodback to the compressor, a suction line accumulator is needed on the system.


Read More

The Professor: Frosted Compressor Head

September 3, 2012
Many service technicians believe that frost on a suction line or on the compressor’s head itself indicates there is liquid refrigerant coming back to the compressor. Is this really true? 


Read More

Multimedia

Videos

Image Galleries

2014 MCAA Annual Convention

Scenes from the 2014 MCAA Annual Convention in Scottsdale, Ariz.

Podcasts

NEWSmakers: Julian Scadden

Training is an ongoing process. Julian will discuss how you can generate maximum return on time and energy invested training by following a three part process. Listen to this podcast to get expert tips on training, tracking and follow up. 

More Podcasts

THE MAGAZINE

ACHRNEWS

NEWS 04-14-14 cover

2014 April 14

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

SERVICE CALLS POLL

Which statement on service calls best applies to your business?
View Results Poll Archive

HVACR INDUSTRY STORE

plumbing-hvac.gif
2014 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research

 

Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

DON'T MISS A THING

Magazine image
 
Register today for complete access to ACHRNews.com. Get full access to the latest features, Extra Edition, and more.

STAY CONNECTED

facebook icontwitter iconyoutube iconLinkedIn i con