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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

58:13

Gas Furnace Diagnosis & Inspection w/ Jim Bergmann

HVAC School - For Techs, By Techs ·

2020/12/10

In this podcast episode, Bryan and Jim Bergmann talk about gas furnace diagnosis and inspection. They cover the ins and outs of furnace assessment. A gas furnace diagnosis requires a few important measurements, but a solid visual inspection is perhaps even more vital. You'll want to look at the venting and condensate disposal systems. You'll want to make sure the flue gas can escape properly and that the terminations are correct and safe; if you're not looking at the manual and checking the venting,

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08:14

Pitot vs. Static Pressure Probe - Short 104

HVAC School - For Techs, By Techs ·

2020/12/08

In this short podcast episode, Bryan talks about the differences between pitot tubes and static pressure probes. He also explains how each one works. People often mix up static pressure probes and pitot tubes. A pitot tube is a tube within a tube, and a static pressure probe is just a tube with holes in the side but not at the end. When we measure static pressure, we're measuring the pressure against the duct. (Think of it as balloon pressure rather than air velocity.) We use static pressure probes

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23:04

Balancing Evaporators in a Circuit Using the TXV

HVAC School - For Techs, By Techs ·

2020/12/03

In this podcast episode, Bryan and Nathan discuss balancing evaporators in a multi-coil circuit. They specifically focus on using the TXV to do so. When we say "balancing evaporators" in a multi-coil circuit, we're referring to the temperature of the air leaving the system; we are worried about the air keeping the product cool in grocery refrigeration. If everything works correctly, the evaporators on a rack can have different temperatures due to different refrigerant flow rates. That's when we can

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08:53

Mass Flow vs. Volume Flow - Short 103

HVAC School - For Techs, By Techs ·

2020/12/01

In this short podcast episode, Bryan discusses the difference between mass flow and volume flow when referring to HVAC equipment processes. When you are confused as to whether you're dealing with mass or volume flow, think about the units. For example, cubic feet per minute (CFM) is a measure of volume because we're talking about cubic units. We care about the volume when we think about air mixing and velocity, but volume isn't much of an indicator of the actual cooling power. The mass or weight of

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29:21

Freezing Evaporator Fun Facts & Frippery

HVAC School - For Techs, By Techs ·

2020/11/26

In this episode, Bryan and Sam discuss freezing evaporator coils. They explain why frozen coils happen and how to address them. When the coil's surface temperature drops below freezing (32 degrees), the moisture in the air that condenses on the coil can freeze to the coil. In those situations, your suction saturation will probably be in the mid to high twenties. Generally, freezing evaporators will occur when you have less load on the evaporator. When there is less heat, the evaporator temperature

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37:21

Drain Cleaning - More To It Than We Think

HVAC School - For Techs, By Techs ·

2020/11/19

Mike Klokus and Corey Cruz from Kalos come on the podcast to talk about drain cleaning. They discuss their tips and some best practices. Approximately 50% of the calls in the light commercial division have to do with drains, and drain cleaning is a common PM procedure. The procedure starts off when you pull the panel off the air handler and look in the drain pan. Muck can accumulate in the pan and in the back and side channels. Pay attention to the unit orientation and the drain pitch before you

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06:15

Open v Closed Refrigeration - Short 102

HVAC School - For Techs, By Techs ·

2020/11/17

In this short podcast episode, Bryan talks about the differences between single-phase and two-phase refrigeration. This particular episode is about the fundamentals of physics, chemistry, and science in general. When we talk about phases, we're referring to the changes in the states of matter. We typically think of the states of matter as solid, liquid, and gas. In refrigeration systems, the refrigerant usually changes from a liquid to a vapor in the evaporator and then from a vapor to a liquid in

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45:29

Changing Refrigerant Regulations w/ Bluon

HVAC School - For Techs, By Techs ·

2020/11/12

In this episode, Bryan talks with Peter Capuciati and Bryan Johnson from Bluon. They discuss how refrigerant regulations keep changing and how technicians can make sense of it. We've begun phasing out R-22; the refrigerant can no longer be imported or manufactured in the United States. We can still recover and reclaim R-22, but the recovered refrigerant on the market can't meet the usual demand. R-22 went through a phaseout because of its ODP; R-410A has 0 ODP and was the main replacement. However,

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09:27

Single Phase v Two Phase Refrigeration - Short 101

HVAC School - For Techs, By Techs ·

2020/11/10

In this short podcast episode, Bryan talks about the differences between single-phase and two-phase refrigeration. This particular episode is about the fundamentals of physics, chemistry, and science in general. When we talk about phases, we're referring to the changes in the states of matter. We typically think of the states of matter as solid, liquid, and gas. In refrigeration systems, the refrigerant usually changes from a liquid to a vapor in the evaporator and then from a vapor to a liquid in

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33:04

Floating Head Strategies

HVAC School - For Techs, By Techs ·

2020/11/05

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37:08

CO2 Architecture

HVAC School - For Techs, By Techs ·

2020/10/29

Don Gillis joins us again to talk more about common types of CO2 systems and how they differ

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55:28

Heat Pumps in Cold Climates

HVAC School - For Techs, By Techs ·

2020/10/27

In this episode, we are joined by three people who know a lot about heat pumps and cold weather. We also cover everything from the way technologies have changed, some of the pitfalls to keep away from, and why heat pumps work even in really cold climates nowadays. Chad Gillespie: Chad is a senior manager, part of Mitsubishi Electric’s Performance Construction Team. He currently leads a national team of business development managers tasked with growing the new construction market for high-performance

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46:01

Demand Cooling + Liquid and Vapor Injection

HVAC School - For Techs, By Techs ·

2020/10/22

Trevor Matthews is back and dropping more compressor knowledge on us. This time, he talks about demand cooling and liquid and vapor injection. In low-temperature applications, the discharge temperature would get very high and lead to oil breakdown and thermal overload, so demand cooling is a means of cooling the compressor. Demand cooling injects saturated refrigerant into the compressor body to cool it down. You're not jamming liquid into the compressor; the refrigerant flashes, which achieves a

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38:39

Intro to CO2 w/ Don Gillis

HVAC School - For Techs, By Techs ·

2020/10/15

Don Gillis with Emerson joins us on the podcast to teach us the basics of CO2 as a refrigerant. He explains how it works and its applications. Carbon dioxide is a colorless, odorless gas that is becoming an important refrigerant for commercial refrigeration (R-744). It is desirable because it has a low critical point and high triple point, so we can use subcritical (below the critical point) and transcritical (above the critical point) CO2. Carbon dioxide also has a very low global warming potential

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44:17

Building Performance QA with Sam Myers

HVAC School - For Techs, By Techs ·

2020/10/01

Sam Myers of Retrotec joins Bryan and Kaleb on the podcast to discuss building performance. He also answers some of our listeners' questions. Checking airflow is important for building science as well as HVAC. However, "airflow" is vague and can refer to static pressure readings (which isn't actually "airflow" at all), air from whole-home ventilation systems, or CFM per ton. We can also look at total system airflow with flow hoods. Equipment settings also matter when it comes to measuring airflow as

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01:00:24

What is Correct Airflow?

HVAC School - For Techs, By Techs ·

2020/09/28

The great Ed Janowiak (Jon-Oh-Wok) joins us to talk about what correct airflow really looks like. He also explains how to design for it appropriately. The ACCA design series (Manuals J, S, and D) all go hand in hand to design HVAC systems properly for a given space. Correct airflow will depend on how a technician or designer uses the ACCA design series. When we say "correct airflow," we mean that the CFM per ton matches the sensible and latent load for a space while maximizing comfort for building

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48:14

Digital Compressor Facts

HVAC School - For Techs, By Techs ·

2020/09/24

Have you ever heard a compressor that keeps changing in sound as it runs? Trevor with Emerson tells us more about what that is all about and how the digital compressor operates.

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56:00

Small Refrigeration Talk

HVAC School - For Techs, By Techs ·

2020/09/21

Joe and Eric join us, and we have a general conversation about small self-contained refrigeration units, including residential and commercial. Small refrigeration includes self-contained reach-ins and small walk-ins. These units typically use capillary tube metering devices. Some of the biggest failures that occur in small refrigeration systems happen because of dirty condensers and user error (leaving doors open, etc.). You'll also want to check that the fans are working, the compressor is running,

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01:01:07

Single Pole Contactors & Crankcase Heaters

HVAC School - For Techs, By Techs ·

2020/09/17

Kaleb, Joe, and Eric join us again to discuss some myths about single-pole contactors. We also cover some weird crankcase heater wiring configurations. When you have a single-pole contactor on a unit with no other resistance crankcase heater attached, the contactor energizes the compressor but is NOT a source of crankcase heat. That myth about single-pole contactors likely stems from a misunderstanding of Ohm's law and resistance heat. We care about crankcase heat because we want to prevent

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50:41

Electronic Expansion Valves

HVAC School - For Techs, By Techs ·

2020/09/14

Trevor Matthews with Emerson Canada comes on the podcast once again to talk about electronic expansion valves (also known as EEVs). He explains how they work, what they do, and how to diagnose them. Trevor compares electronic expansion valves to TXVs on steroids; they accomplish similar tasks, but EEVs have faster response times, better accuracy, and can improve system efficiency. The valve operates on a controller, which is the "brain" of the EEV that tells it to open or close. EEVs can come in the

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