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PODCAST

HVAC School - For Techs, By Techs

Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

business careers

All Episodes

11:06

Buck & Boost Autotransformers - Short 126

HVAC School - For Techs, By Techs ·

2021/08/24

In today’s short podcast, Bryan discusses buck-boost (auto) transformers and what they do. Autotransformers are not automatic; the “auto” prefix comes from the fact that autotransformers only have one inductive winding. That winding is shared by the primary and the secondary, so it is not an isolation-type transformer. These transformers run current through the same winding used for induction. Buck-boost transformers rise or decrease voltage. When the transformer “bucks,” it decreases voltage from

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57:54

An Effective IAQ Process w/ John Ellis

HVAC School - For Techs, By Techs ·

2021/08/19

In today’s podcast, John Ellis joins Bryan to talk about indoor air quality (IAQ). He also explains the ideal process for providing IAQ solutions. John has a lot of experience working as a consultant for people who have respiratory issues, so he has valuable perspectives. The HVAC and IAQ fields intersect in the areas of thermal comfort, humidity, building pressures, ventilation, filtration, and source control (which pollutants are present, where they come from, and how we can remove them). John

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01:06:22

Caring for Technician Mental Health

HVAC School - For Techs, By Techs ·

2021/08/18

In today’s podcast, Scott Krasman from TZOA, Andrew Greaves, and Kaleb Saleeby join Bryan for a conversation about mental health in the trades. We have a greater awareness of mental health than we ever did before, and although some of us may make fun of the topic, it is something we should focus on as HVAC technicians and business owners. “Toxic” is a common buzzword these days, but it’s relevant here. A work environment with toxic traits will wear you down over time as you are exposed to

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57:38

Troubleshoot the System! w/ Jim Bergmann

HVAC School - For Techs, By Techs ·

2021/08/12

In today’s podcast, Jim Bergmann talks about troubleshooting the entire system. He takes a holistic approach to the art of troubleshooting, NOT just an equipment-centered one. According to NIST, the most common HVAC system problems are duct leakage, refrigerant undercharge, and oversized equipment (often for undersized ducts). Duct leakage heavily affects the envelope; the equipment only plays a part in conditioning a space. As such, you will want to seal up holes that lead to unconditioned spaces,

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50:36

How to Measure Total System Airflow w/ Steven

HVAC School - For Techs, By Techs ·

2021/08/05

In today’s podcast, Steven Rogers joins Bryan to talk about measuring total system airflow. Fluid measurement is NOT restricted to liquids; a fluid is anything that flows, including liquids and gases. In HVAC, we deal with both of them, but airflow is strictly limited to the flow of gas. The airflow we experience in HVAC is exclusively turbulent flow, NOT truly laminar flow. Total system airflow is difficult to measure directly; we can use flow hoods, but they have their limitations, especially on

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18:44

HVAC/R Career Advancement - Short 125

HVAC School - For Techs, By Techs ·

2021/08/03

In today’s short podcast, Bryan explains how growth happens in an HVAC/R career. He also gives tips to get “unstuck” if you feel like you aren’t moving forward. You won’t move forward if you haven’t set a goal to move forward. Making a “vision board” helps you determine what matters in your life, and it helps you clarify what you’ll need to do in order to achieve your life goals. That way, you can use your career to help achieve those goals and see whose support you need. Having a growth mindset and

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47:56

Mini-Split Controls Strategy w/ METUS

HVAC School - For Techs, By Techs ·

2021/07/29

In today’s podcast, Bryan and a team of Mitsubishi Electric Trane HVAC US (METUS) managers (Mike Schaefer, Charles Miltiades, and Sly Grimm) discuss mini-split controls strategies. Some contractors misunderstand what mini-splits are. Mini-splits CAN be ductless, but not all of them are ductless. Mini-split systems also have handheld controls, but those are not the only control options for mini-splits. Mini-split controls also come in wi-fi, wall-mounted, and wired varieties. Another common

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13:45

Key System Performance Factors - Short 124

HVAC School - For Techs, By Techs ·

2021/07/27

In today’s short podcast, Bryan discusses the key factors for system performance WITHOUT doing a deep dive into system commissioning. “Performance” refers to system efficiency, capacity, air filtration/cleanliness, longevity, and the ability to match the latent and sensible loads of a space. System airflow is the main performance factor to consider. To determine proper airflow (CFM), consult Manuals S, J, and D to perform calculations. In general, the absolute lowest limit is around 275 CFM (in

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30:41

Copeland Scroll Compressor Multiples for Air...

HVAC School - For Techs, By Techs ·

2021/07/22

In today’s podcast, Trevor and Bryan discuss Copeland Scroll Compressor Multiples for Air Conditioning. “Multiples” refer to equipment setups with multiple compressors that have connected suction and discharge lines, so they resemble parallel rack refrigeration setups. Multiples typically come in tandem (2) or trio (3) sets. Compared to having a single giant compressor, multiples are more efficient, more reliable, and have the ability to keep running in case if there’s a compressor failure. As a

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11:41

Margin, COGS, Markup & Profit Confusion - Short 123

HVAC School - For Techs, By Techs ·

2021/07/20

In today’s short podcast, Bryan clears up the differences between markup and profit margins in HVAC businesses. The number one mistake that people make in business is confusing markup and gross margin. For example, you can double the price of a $50-part and sell it for $100. That would be a 100% markup. However, your gross margin is NOT 100%; your gross margin is only 50%; you only made a 50% profit on the total sale. In the same case you have above, you have a 50% cost of goods sold (COGS). COGS

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48:57

Planning and Layout of HVAC Projects

HVAC School - For Techs, By Techs ·

2021/07/15

In today’s podcast, Eric Mele and Bryan explain the planning, layout, and execution of HVAC projects. They mostly cover commercial ductwork but also touch on piping and some residential projects. Planning The first step is to review the construction plan WITH a site visit. It is best to see how a plan works within the space; plans may be feasible on paper but may not work out as planned in the actual space. During the site visit, you also want to establish solid communication with everyone else on

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10:47

Startup vs commissioning - Short 122

HVAC School - For Techs, By Techs ·

2021/07/13

In today’s short podcast, Bryan explores the differences between startup and commissioning. Startups typically involve going in during the construction phase after the drywall has been sealed up. (Vents, ducts, and copper piping typically go in before the drywall.) A technician can then perform a startup. The startup includes testing the drain line, checking the charge, checking for leaks, and seeing if the equipment performs its most basic function. (Does the gas furnace make flame? Does the A/C

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52:10

How to Make Mentorship Work w/ Eric Kaiser

HVAC School - For Techs, By Techs ·

2021/07/08

In today’s podcast, Eric Kaiser and Bryan talk about mentorship in the HVAC industry. They discuss what it means to be a good mentor, how to find a good mentor, and what it means to be mentored. Mentorship is an organic process. Most mentees don’t go up to someone they respect and formally ask that person to be their mentor. Respect is the foundation of the mentor-mentee relationship; formal mentorship often resembles friendship in many ways. However, mentorship can take more forms than the

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56:14

Alternatives for College That Parents Should Consider

HVAC School - For Techs, By Techs ·

2021/07/01

In today’s podcast, Bryan explores the upsides of choosing a career in the skilled trades instead of going to college. He also covers ways to prepare your child for a trades education and career while they are still deciding what to do with their lives. When we think about what we want for our kids, the following goals come up quite often: purpose, financial upside and reward, freedom from debt, and joy. The trades can offer a lifestyle that covers all of these bases. However, the opinions of our

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10:44

Triple Evacuation - Short 121

HVAC School - For Techs, By Techs ·

2021/06/29

In today’s short podcast, Bryan explores triple evacuation. Many people believe that we don’t like triple evac, but that’s simply NOT true. We’re here to set the record straight. If the manufacturer tells you to follow triple evacuation processes, then it’s a good idea to do what they say. We won’t argue with that. However, our argument is that the procedure can be more time-consuming than it’s worth when it’s NOT necessary. Deep vacuum technically counts as a vacuum pulled below 500 microns (in

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53:28

How to Teach the Physics of Everyday Life

HVAC School - For Techs, By Techs ·

2021/06/24

In today’s podcast, Bryan explains how he teaches physics. He believes that teaching physics is about continuously building a mental model, and he covers the methods and mindsets that facilitate that learning style. The basic Wikipedia definition of physics states that it is a science that deals with matter, energy, and their interactions. Even then, we can simplify “matter” to “stuff.” Simplifications like these help students feel more familiar with the subject and NOT feel intimidated by the

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07:35

Be Careful With Cold Tanks - Short 120

HVAC School - For Techs, By Techs ·

2021/06/22

In today’s short podcast, Bryan explores the dangers of cold tanks during refrigerant recovery. Whenever you have a recovery tank, you only want to fill it to 80% capacity in the liquid state. The same goes for all sorts of vessels (coils, etc.). However, capacity isn’t the only factor to consider for safety. We need to know what our maximum temperature will be. You will be in greater danger of overfilling a tank when it is cold because higher temperatures increase the pressure. High pressure in a

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52:57

Dehumidification Facts w/ Nikki

HVAC School - For Techs, By Techs ·

2021/06/17

In today’s podcast, Nikki and Bryan discuss dehumidification. They cover the relationship between cooling and dehumidification, humidity control, and dehumidifier installation practices. If the A/C unit is the king, the dehumidifier is the queen. The A/C unit controls cooling and humidity, but it can only do so much. A dehumidifier helps the A/C manage comfort under more demanding conditions. Many factors contribute to comfort, including sensible heat ratio (SHR), relative humidity (RH), and

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50:01

TXV Troubleshooting w/ Trevor

HVAC School - For Techs, By Techs ·

2021/06/10

In today’s podcast, Trevor and Bryan discuss how to troubleshoot thermostatic expansion valves (TXVs/TEVs). They also dive into the various types, applications, and components of TXVs. TXVs are metering devices that control evaporator superheat to protect compressors from harm. Controlling heat also regulates pressure, which improves efficiency and prevents issues like floodback and overheating. TXVs contain several components that manage the forces that open and close the valve. These components

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06:41

Push Pull Recovery - Short 119

HVAC School - For Techs, By Techs ·

2021/06/08

In this short podcast episode, Bryan discusses push-pull recovery, how it works, and what we need to know about it. Push-pull recovery is a somewhat counterintuitive method of recovering liquid rapidly. We simply do that by pulling refrigerant out of the system and pushing it into the tank. However, when we pack refrigerant into a tank, the tank pressure and temperature increase. So, it can be more difficult to get refrigerant into the tank as the job goes on. When we recover liquid refrigerant on

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880 results

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