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Nov 2020
Air Curtains: Using Biopolar Ionization
Air curtain manufacturers are integrating
disinfection equipment into their products.
the air curtain, of course, is a well-established
technology that is more than seven decades
old. It is traditionally used to cut heating or
cooling energy costs and protect the building
occupants’ comfort by separating indoor
and outdoor environments at a doorway.
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Oct 2020
BREAKING: AHR 2021 Cancelled
Breaking News: AHR 2021 has been cancelled after working with McCormick Place to tentatively reschedule the Show for March 2021. With roadblocks set in place by the ongoing COVID-19 pandemic and current state and local restrictions that prohibit mass gatherings over 50 people, an in-person event will not take place in 2021.
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Oct 2020
Leading Off: A Year Gone Too Fast
I don’t know about you but this year in some ways has slowly drudged by, when I look back at what I wanted to accomplish in every area of my life this year has gone by way too fast. It seems like around every corner there was a ? re to put out, key manufacturers furloughing employees and missing critical delivery dates, as well as new policies and protocols that needed to be implemented immediately and revised often.
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Oct 2020
Part 3: EC Indoor Blower Motors, Resistance is Futile
In this article, I will focus on diagnosing the ECM when it is not operating. EC
indoor blower motors are commonly designed with two separate inputs for proper operation: 1Th e line voltage that powers the ECM; and 2the communication that provides the on/off command as well as the operating value (speed, torque or airflow). Both of these inputs are necessary for the ECM to operate.
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Oct 2020
Hydronics: Best Practices for Residential Boiler Service
Boilers must be serviced annually—there is no way around it. A boiler that is not properly serviced and maintained will be prone to breakdown or, at best, operate at a lower efficiency and costing the homeowner money. This article will focus on residential service. Commercial building owners tend to be more diligent about boiler service, and they do not do things such as planting
shrubbery around intake and exhaust vents to hide them.
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Oct 2020
Methods of Defrost in Refrigeration Applications -- Part 1
Refrigeration systems that operate with an evaporator refrigerant saturation temperature of 32°F (or lower) will experience an accumulation of frost on the evaporator tubes and fins. The frost acts as an insulator between the heat load in the refrigerated space and the refrigerant fl owing inside the evaporator tubing, decreasing the efficiency of the heat transfer process.
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Oct 2020
Sensor System Integration
Low-cost, easy-to-install wireless sensors are becoming standard practice when it comes to remotely monitoring temperatures in refrigeration equipment such as walk-in coolers and freezers, cold rooms, beverage coolers, cold tables and more. Such sensor systems can be retrofi tted to existing equipment or used with new equipment to monitor temperature, humidity, vibration and other conditions.
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Oct 2020
Close at Hand...Tools of the Trade
As an HVACR contractor, technician or facility manager the tools you use are fundamental to your success on a job. Using the wrong tool at a jobsite could mean the difference between ?nding a live wire and missing it. That is a difference that could be deadly.
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Oct 2020
Troubleshooting: Cooling Demand
The problem: I responded to a call for a pharma clean room not keeping up with the cooling demand. My ?rst rule when approaching a service call is to communicate with the customer and pull any data from the BAS, then visually inspect and then ensure air? ow is well, ? owing.
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Oct 2020
Last Word: The Age of Automation
Automation and IoT are subjects that have come up quite a bit in the past. Almost every AHR Expo in the past ?ve years has made a signi?cant leap forward in the world of IoT as it relates to the HVACR world.
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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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