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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

11:41

Other Uses for Nitrogen - Short 113

HVAC School - For Techs, By Techs ·

2021/02/23

In this episode, Bryan and Craig Migliaccio (AC Service Tech) discuss all the ways that nitrogen can make your job easier. Nitrogen is an inert gas that we can use for purging refrigerant lines and completing scale-free brazing jobs. As techs, we should have at least one inert gas in our trucks to help us do the best job possible. We can use inert gases for purging refrigerant from tubing, flowing and preventing oxidation while brazing, and pressurizing a system for leak detection or a pressure

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39:41

Is Ultrasonic Leak Detection Best?

HVAC School - For Techs, By Techs ·

2021/02/18

In this podcast episode, Bryan and Craig Migliaccio, AC Service Tech, talk about ultrasonic leak detection. They discuss its effectiveness and if it's worth the hype. Ultrasonic leak detection works best when there's oil on the inside of the tubing; it works best when the system is equalizing after shutoff. Oil or moisture can create a squealing noise, which is an indicator of a leak. Ultimately, lack of success with ultrasonic leak detection comes down to user discomfort and a lack of proficiency

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52:20

Universal Defrost Controls w/ Jim Fultz

HVAC School - For Techs, By Techs ·

2021/02/17

In this podcast episode, Jim Fultz with White-Rodgers joins us to discuss universal defrost controls. He also explains when and why you might use universal controls. Bryan and Jim cover a universal defrost control for heat pumps (Model #: 47D01U-843). You can follow along by reading the manual HERE. Universal defrost controls can replace OEM defrost controls. Universal controls are sometimes more readily available than OEM parts, so they can be good repair options. The White-Rodgers universal heat

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24:31

Maybe Don't Buy New Tools - Short 112

HVAC School - For Techs, By Techs ·

2021/02/16

In this short podcast episode, Bryan and Craig Migliaccio discuss why you maybe don't want to buy new tools. Whenever you get new tools, you have to account for a learning curve and potential change to your practices. Changing your practices and procedures isn't necessarily a bad thing, but you have to practice with the tool and account for different setup and cleanup procedures. However, once you find a good process, you don't want to mess with it too much. You will also want to account for changes

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41:12

How Craig Became "AC Service Tech"

HVAC School - For Techs, By Techs ·

2021/02/11

In this podcast episode, we find out how Craig Migliaccio became "AC Service Tech." He makes educational materials and has even written a book. You can check out his website HERE and his YouTube channel, AC Service Tech, HERE. Craig got into the HVAC trade after coming from a construction background; he mostly worked on existing homes and had to handle some HVAC tasks. From there, he got into service and went headfirst into the HVAC industry by starting his own business: a carpentry and HVAC

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23:01

What Skills and Knowledge Should You Start With? -...

HVAC School - For Techs, By Techs ·

2021/02/09

In this short podcast episode, Bryan and Craig Migliaccio discuss the skills and knowledge you should have to start in the HVAC industry. Of course, basic mechanical skills and knowledge are important before you get into the HVAC trade. You'll greatly benefit from knowing where and how to hammer nails, tighten screws, and identify all sorts of tools. When getting into the HVAC industry, one of the low-hanging fruits that you need to consider is your sheet metal skills. Know how to cut sheet metal,

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48:05

Controlling Liquid Refrigerant in A/C

HVAC School - For Techs, By Techs ·

2021/02/04

In this podcast episode, Bryan and Trevor Matthews of Emerson Canada discuss strategies for controlling liquid refrigerant in A/C and refrigeration systems. They also read through the AE22-1182 bulletin, which you can find HERE. Liquid refrigerant is one of the most common causes of compressor damage and even failure. It can also cause a loss of oil, which leads to reduced lubrication and subsequent damage. Compressors are vapor pumps, and they are not designed to handle much liquid refrigerant at

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08:37

TXV Power Element / Power Head - Short 110

HVAC School - For Techs, By Techs ·

2021/02/02

In this short podcast episode, Bryan talks about the TXV power element or power head. He explains what it does and why it's important. A TXV power element threads onto the top of the valve, and it's where the sensing bulb attaches to the valve. It is the component that applies the opening force to the TXV. When you lose the charge in the element, it stops exerting an opening force on the valve. So, the valve completely shuts and doesn't allow refrigerant to get to the evaporator coil. You'll get

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53:06

How to Value Engineer Better w/ Alex Meaney

HVAC School - For Techs, By Techs ·

2021/01/28

In this episode, Bryan and Alex Meaney talk about value engineering. They discuss what it means to value engineer better when it comes to construction projects. Value engineering is about finding ways to reduce the costs of a project. However, we don't want to do a bad job or use extremely cheap materials just to bring the price tag down. In many cases, builders will want to reduce the cost as much as possible, but we also want to make sure the construction project works in the end. In other words,

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12:38

TXV Bulb Placement - Short 109

HVAC School - For Techs, By Techs ·

2021/01/26

In this short podcast episode, Bryan talks about the placement of the TXV sensing bulb. He also explains how it affects the opening force on the TXV. The TXV sensing bulb (or sensor on an EEV) provides the opening force for the valve. The warmer the bulb gets, the more the valve opens; the colder the bulb gets, the more the valve closes. The TXV also has a closing force provided by the spring pressure and equalizer (usually the external equalizer). So, if you have a bulb that has been poorly mounted

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34:22

Dealing with Difficult Customers

HVAC School - For Techs, By Techs ·

2021/01/21

In this podcast episode, Bryan, Erich Vinson, and Anthony Marino talk about dealing with difficult customers in the HVAC industry. When working with customers in general, it is best to make eye contact with the customer, listen to them, and put yourself in their shoes. When dealing with difficult customers, we must remember that there are several potential causes for their "difficulty." You can't control that; you just have to let the anger run its course and diffuse the situation as much as

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08:11

Hydrostatic Pressure - Short 108

HVAC School - For Techs, By Techs ·

2021/01/19

In this short podcast episode, Bryan explains how hydrostatic pressure can build up in refrigerant cylinders and present a hazard to technicians. Your refrigerant cylinders have tare weight and water capacity values stamped on the tank. You'll want to use these when weighing the refrigerant you recover because you don't want to exceed 80% capacity. However, capacity changes when the liquid density changes; that density will change with pressure and temperature. Hydrostatic pressure builds up when

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39:11

Introduction to Industrial Refrigeration

HVAC School - For Techs, By Techs ·

2021/01/14

In this podcast episode, Bryan, Trevor Matthews, and Jim Dick from Emerson give us all an introduction to industrial refrigeration. Jim works with contractors to provide tech support. He also does the startup and commissioning of refrigeration compressors and gas compression units. Industrial refrigeration refers to warehouses and distribution networks. Grocery refrigeration is commercial refrigeration for the end-user, but industrial refrigeration is commercial refrigeration for the distribution

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07:40

Prevent Refrigerant Migration - Short 107

HVAC School - For Techs, By Techs ·

2021/01/12

In this short podcast episode, Bryan talks about the strategies we can use to prevent refrigerant migration during the off cycle. We often see refrigerant migration when the compressor is lower than the evaporator, especially in low-ambient conditions when the refrigerant can condense in the crankcase. When the compressor starts up, you get a violent reaction as the refrigerant boils off and ejects oil. That can wear out the compressor and reduce the lubrication. Crankcase heaters are some of the

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27:39

Weird Transformer Talk

HVAC School - For Techs, By Techs ·

2021/01/07

In this podcast episode, Eric Mele joins Bryan for some weird transformer talk. They discuss corner-tapped transformers and some thought experiments. We hadn't been able to get our heads around corner-grounded transformers until recently. "Grounding" doesn't necessarily change the phase or lead that you ground. If you take the secondary of a 24-volt transformer and measure from your two colors, you'll measure 24v. However, if you connect a lead to ground, you'll still read 24v. (Don't ground both,

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06:59

Internal vs. Externally Equalized Valves - Short 106

HVAC School - For Techs, By Techs ·

2021/01/05

In this short podcast episode, Bryan compares internal and externally equalized valves. He also covers how forces act upon the TXV. Equalization does not happen on the off cycle. When we talk about equalization, we are merely talking about a force that balances against the bulb force. A TXV sets the superheat within an operating range at the evaporator outlet; the sensing bulb on the TXV detects temperature and pressure at the evaporator outlet. So, those readings apply an opening force to the bulb

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42:08

Custom Performance Home w/ Spohn

HVAC School - For Techs, By Techs ·

2020/12/31

In this podcast episode, Bryan talks with Bill Spohn about his most recent project, SpohnHome. SpohnHome explores Bill's journey in custom home performance. Projects are complicated because so many trades work together to accomplish a building. However, custom homes are particularly challenging, especially in Bill Spohn's case. His home is a "personalized performance home," so he's prioritizing energy efficiency, indoor air quality, and comfort as well as aesthetics. The home's design and purpose

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07:20

Service Valve Tips - Short 105

HVAC School - For Techs, By Techs ·

2020/12/29

In this short podcast episode, Bryan talks about some tips you can use when working with a multi-position service valve. A service valve will have a line connection, which connects the valve to your line set. You also have a gauge port that you can connect to, a valve stem, and a packing gland nut (directly beneath the valve stem). If your stem is completely back-seated, then your gauge port is completely closed from both the line and system connection. If you crack the stem off the back seat, then

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33:44

Refrigeration Scroll Compressors

HVAC School - For Techs, By Techs ·

2020/12/24

In this podcast episode, Bryan and Trevor Matthews from Emerson talk through scroll compressors in commercial refrigeration equipment. Scroll compressors are not a monolith; although they all function similarly, they have different fine details and manufacturing protocols by application. Low-temp, medium-temp, high-temp, and A/C scroll compressors each have unique designs, operating conditions, and service considerations. Copeland has a medium-temp scroll compressor line (ZB and ZS) for medium and

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36:40

Bert's Top Soft Skills Tips

HVAC School - For Techs, By Techs ·

2020/12/17

In this episode, Bryan and Bert talk about soft skills. They also discuss why soft skills are important in highly technical trades. Bert's class defined "soft skills" as communication skills; these can be verbal but may also include body language and how we respond to emotional situations. Bert thinks these skills are some of the most important skills you can develop in the HVAC industry and in life overall. You will only be able to make the most of your talents and career if you work on your

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