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Mar 2021
Relays and Contactors: Part 2
Impedance relays are also called lock-out relays, reset relays, and anti-short cycle controls. All of these terms refer to the same device and the same function. Figure 5-15 shows a typical lock-out relay circuit.
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Mar 2021
Troubleshooting: Too Hot to Handle
I had a call for a routine furnace inspection. The customer
said “It’s just a furnace check-up, everything is fine. “This
is a 1,400-sq-ft, three bedroom house with a 75,000-Btuh
80% furnace and a 3-ton A/C. Maybe a little oversized for
the San Antonio, TX area, but in the ballpark.
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Mar 2021
Last Word: HVACR to the Rescue
The world has changed quite a lot in a year. You
don’t need me to tell you this, you already know it.
COVID-19 may have been the cause but we are just
now starting to see the long-term effects of the virus on
the HVACR community.
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Mar 2021
Leading Off: Invest in Yourself
Today it is even more important to keep up with the
changes in the industry. Efficiencies are increasing so we
need to keep up with the technologies that accomplish that.
We are seeing hydrocarbon and A2L refrigerants. There is a
lot of wireless technology and home connected devices.
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Feb 2021
Proper Procedures for Brazing Pipe and Tubing
Brazing is an integral part of installing
and repairing HVAC/R systems.
This metal joining process utilizes
a filler metal that melts above 840°F/450°C
and below the melting point of the base
metals.
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Feb 2021
Field Modifications of Fire, Smoke, and Combination Fire/Smoke Dampers
From the simple extension
of a damper sleeve to the
replacement of a damper
actuator, common changes
that may be needed
for a factory-supplied
life-safety damper to be
installed properly.
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Feb 2021
Part 2: The Equal Friction Method of Duct Sizing
This two-part feature on duct sizing is housed
in the RSES Service Application Manual
collection. Part 2 concludes the “equal friction
method” of duct sizing by exploring the
meaning of corrected pressure drop tables
and friction loss charts.
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Feb 2021
Part 1: Relays & Contactors
Circuit control, in its simplest form, is the application
and removal of power. This can also be expressed as turning
a circuit on and off, or opening and closing a circuit. Circuit
control devices come in many different shapes and sizes,
but most are categorized as switches, solenoids or relays.
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Feb 2021
Leading Off: Trust Your Sources
Is the internet a good thing or a bad thing? My answer is
both.
There is a lot of good information that can be found
on your cell phone, your tablet, or your computer. Unfortunately, not all of that information is correct. Anyone
can post information on the internet or one of the social
media sites, and it might be correct, or it could be completely false.
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Feb 2021
Last Word: Perspective and Balance
Do you ever get the sense that the world and the people
in it are simultaneously moving faster and slower at
the same time? It is an interesting phenomenon to
observe, and I am airing my opinion here about it because it
is relevant to our time.
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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.
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