Jun 2020
(More Than) One Hundred Years of Ammonia Refrigeration
Step back in time to learn about the history of ammonia from the RSES “620-88 Section 1E” Service Application Manual (SAM) Chapter re-published here from the SAM archive.
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Jun 2020
EC Indoor Blower Motors, Resistance is Futile
Thirty-two years after ECM technology was introduced to the residential and light commercial HVAC industry, the indoor blower motor segment of this industry is now almost completely converted from PSC to ECM. Interestingly enough the first application for ECM in the HVAC industry was also the indoor blower motor. The constant airflow “variable speed” indoor blower motor was introduced by GE in 1987.
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Jun 2020
Resolving Customer Complaints for High Humidity
Service technicians often see an air-conditioning system operating within manufacturer’s speci?cations, yet still hear the customer complain about comfort issues. This is where things start to become more of a challenge to diagnose.
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Jun 2020
REHVA COVID-19 Guidance Document
How to operate and use building services in order to prevent the spread of the coronavirus disease (COVID-19) virus (SARS-CoV-2) in workplaces.
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Jun 2020
Troubleshooting: Uncomfortable Customer
In this troubleshooting situation, you arrive at a residential cooling service call and the customer is complaining that they feel uncomfortable inside even though the system is running.
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Jun 2020
Last Word: The Wild and Wonderful World of HVAC
Anyone who says the HVACR industry is out of ideas hasn’t spent time on the internet. As editor for RSES Journal, it is my job to search far and wide for the best and most interesting news that the HVACR industry has to offer.
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Jun 2020
Leading Off: COVID-19 the Obscure
It is time for the continuation and hopefully the completion of Leading Off related to COVID-19. I must be truthful and tell you that I didn’t want to write about it, talk about it, see any news about it, or even think about it.
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May 2020
Last Word: Don’t be Old School About New Technology
I strongly encourage an open mind when encountering a new approach that’s not in your comfort zone. If all human beings chose the closed-minded approach, the world would not advance. One of my old instructors used to say, “read three books and ask three people before forming your own opinion.” What he was trying to reinforce is that we must get information from multiple sources. I would add, choose your sources wisely.
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May 2020
Troubleshooting: What Are You Measuring?
In this troubleshooting situation, a newer technician calls a senior tech on the phone to help him with a diagnosis. “I’ve got a contactor that just won’t pull in even though there is power going to it,” the new technician says.
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May 2020
CUTTING THROUGH THE CLUTTER: Select the Best Refrigerant with Confidence
Over the last several years, the number of refrigerant choices has increased dramatically. The days of having a few refrigerants to serve all applications are long gone. The increase in refrigerant options is largely driven by the need for solutions with lower global warming potentials (GWPs). A refrigerant with a reduced GWP can reduce the total CO2 equivalent impact and meet environmental regulations.
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