The Misunderstood Lockout Relay
Educators love lockout relays and we also love pretending you will still see them out in the field all the time. Sometimes I have to look myself in the mirror in the morning and sadly repeat “lockout relays are dead” several times before the reality sinks in. before I get the emails… they aren't COMPLETELY […]
Read more
Do You Replace the Contactor and Capacitor With a New Compressor
Replacing a compressor is expensive, time-consuming, and physically taxing. If we are replacing a compressor I want us to be doggone sure we aren't going to be dealing with the same thing again and this often includes a shiny new contactor and capacitor (on single-phase units). We received a comment recently that called out the […]
Read more
3 Phase Motors – The Basics
Fundamentally, three-phase, alternating current motors are about as simple as a motor gets. The power company produces three phases by spinning magnets and then on the other end we produce electromagnets that spin the motor according to the same 60 cycles per seconds frequency (60hz). All three-phases are 120-degrees out of phase from one another […]
Read more
EER & COP vs. SEER & HSPF
Let's get through all of the jargon and try to get to the point as quickly as possible. All of these ratings are a calculation of how much energy you have to put into a system in order to get a BTU of heating or cooling out. Simple… But the problem is that cooling and […]
Read more
Get (and Give) More From Remote Training
Most of the content in this article is based on Alex Meaney’s contribution to the HVAC School podcast in the October 2nd, 2020 episode: “How to Get The Most From Online Education.”   Attending a class from your bedroom or home office sounds very convenient, right? That was probably what many Americans would have thought […]
Read more
Understand Heat Pumps
My goal in this tech tip is to help those who struggle to understand heat pumps to get their head around it as quickly as possible as well as understand some of the things a tech needs to know about them. The basic idea of a heat pump is to use the compression refrigeration cycle […]
Read more
Does the Voltage or the Amperage Kill You?
I hear the following phrase a lot It's the amperage that kills you not the voltage While there is truth to the statement it is sort of like saying “it's the size of the vehicle not the speed that kills you when it hits you”… OK so that's a pretty bad example, but hopefully, it […]
Read more
Indirect Soldering Technique
As HVAC/R techs we don't do a lot of soldering generally unless you are in a shop that has embraced Stay Brite® 8 from Harris. There are several aluminum repair products on the market that also use an indirect soldering type technique so this is is a general and generic overview of some best practices. […]
Read more
The Hands On Learner Vs. The Visual Problem Solver
Let's get something out of the way right off the top. Saying that we learn best “hands-on” is sorta like saying we prefer to breathe air… WE ALL NEED TO APPLY THINGS TO LEARN THEM DEEPLY David Sandler wrote the book “You can't teach a kid to ride a bike in a seminar” and the […]
Read more
loading

To continue you need to agree to our terms.

The HVAC School site, podcast and daily tech tips
Made possible by Generous support from