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Aug 2020
Part 2: EC Indoor Blower Motors, Resistance Is Futile
A common misconception about EC indoor blower motors is that they all maintain airflow and solve airflow issues such as undersized ductwork and/ or dirt load on the air side components. In part one of this article (see June 2020 issue of RSES Journal), I explained that there are actually two different types of EC indoor blower motors, constant airflow and constant torque.
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Aug 2020
Making the Humidity Case (Study)
Based on gathered research, which will be presented in this article, there is a demonstrable link between humidity and the infectivity and longevity of a variety of viruses. Th e research demonstrates that at Relative Humidity (RH) levels, between 40%–50%, many types of common and harmful viruses such as influenza and coronaviruses are rendered inert much more quickly than at RH levels of =20%.
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Aug 2020
Troubleshooting: Temperature Spikes
The problem: temperature spikes in a low temp plasma freezer every six hours. On a call such as this, I request the trend log data from the monitoring system so I can look for patterns and I strongly suggest anyone with access to these types of metrics use it to their advantage.
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Jul 2020
What Wet Bulb Temperature Tells Us -- Part 1
It is commonly stated that wet bulb temperature indicates the moisture content of the air. Moisture content of air is called humidity ratio or specific humidity and is measured in pounds of water in a pound of dry air.
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Jul 2020
Under the UV Influence
UV disinfection continues to emerge as a popular virus pandemic defense; learn how it’s being utilized and installation and marketing guidelines.
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Jul 2020
Retrofit for Sustainable Supermarket Refrigeration
Perhaps more than any time in history, supermarket operators are re-evaluating their legacy refrigeration systems. Retail market drivers—including regulatory mandates, sustainability objectives and the emergence of e-commerce fulfillment models—are dictating changes to refrigeration architectures.
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Jul 2020
Troubleshooting: A Split System That's Not Cooling
In this month’s troubleshooting problem, the equipment is a split system that is approximately eight years old, consisting of a gas furnace that provides heat in the winter, and employs a condensing unit and an “A” coil to provide summer cooling.
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Jul 2020
Last Word: A Diff erent School of Thought
Now, as you read this, try to keep in mind that I am just old, not stupid. Electronics certainly enhance our lives, but my advice to junior techs on the subject is “let’s not throw the baby out with the bath water.”
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Jul 2020
Leading Off: Training the Trade
Most of you know that I believe training and education is vital to the HVACR industry. Some may ask: Why does Steve keep talking about this learning and attitude stuff?Most of you know that I believe training and education is vital to the HVACR industry. Some may ask: Why does Steve keep talking about this learning and attitude stuff?
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Jul 2020
Proper Ventilation in 2020
The world is in the middle of a catastrophe like one has never seen before. As scared as I am for my loved ones, I am proud to be of a profession capable of making a difference. This is a ?eld in which we need to further enhance our commitment to ensuring the safety of our clients. Each and every environmental system sold, installed, serviced or maintained should be handled with the utmost care and professionalism.
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RSES is the leading education, training and certification preparation organization for HVACR professionals. RSES publishes various comprehensive industry training and reference materials in addition to delivering superior educational programs designed to benefit HVACR professionals at every stage of their careers through instructor-led training courses, online training for HVAC, educational seminars, interactive CD and DVD products, industry-related reference manuals, and helpful technical content through Service Application Manual chapters, the RSES Journal, the RSES Journal archives and feature articles, as well as web-exclusive features.
Beginning with basic theory and extending to complex troubleshooting, training courses covering refrigeration and air conditioning, heating, electricity, controls, heat pumps and safety may be conducted in a classroom environment or though self study. RSES publications may be purchased by schools, contractors, manufacturers or any other industry group wanting to conduct comprehensive training programs. Seminars covering air conditioning troubleshooting, electrical troubleshooting, compressor training, condenser training, refrigerant piping practices, DDC controls, and more are held in various cities across North America.
Select training programs offer Continuing Education Units (CEUs) and NATE Continuing Education Hours (CEHs).
In addition, RSES offers industry certification preparation materials for refrigerant handling (EPA Section 608), R-410A and North American Technician Excellence (NATE) examinations.
RSES’ monthly magazine, RSES Journal, serves HVAC contractors, service technicians, students, operations/maintenance managers, engineers and technicians who work in the residential, light commercial, commercial and institutional markets on air conditioning, warm-air heating, refrigeration, ventilation, electrical, ice machines, chillers, hydronic heating, piping, refrigeration control and energy management, building automation, indoor air quality and duct cleaning, and sheet metal fabrication equipment and/or systems.
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