HVAC School - For Techs, By Techs
726 episodes - English - Latest episode: 10 days ago - ★★★★★ - 924 ratingsReal training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.
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Episodes
Heat Pump COP and Low Temp Lock Out
April 18, 2024 11:00 - 56 minutes - 77.8 MBThis episode of the HVAC School Live Stream covers the key concepts around heat pump efficiency and understanding the coefficient of performance (COP). Eric Kaiser from TruTech Tools and Jim Fultz from White-Rodgers provide valuable insights into how heat pumps operate and how to optimize their performance, especially in colder weather conditions. The discussion begins by exploring the COP of heat pumps and how it compares to the efficiency of electric resistance heat. A COP above 1 means ...
Motor Protection Types - Short #192
April 16, 2024 11:00 - 10 minutes - 14.3 MBIn this short podcast episode, Bryan talks about motor protection types, including overloads. The most common overload we see in residential HVAC is a built-in thermal overload, which is usually a bimetallic disk that flexes in response to heat (such as from a locked condition, electrical problem, or simply running hot) and opens the circuit. The two metals have different expansion and contraction rates, which causes the flexing; they will return to their original position once the motor c...
Expansion Valves - What Does and Doesn't Matter?
April 11, 2024 11:00 - 1 hour - 83.4 MBThis podcast features a lively discussion on expansion valves, particularly thermostatic expansion valves (TXVs or TEVs), with a panel of expert guests - Corey Cruz (a market refrigeration tech), Matthew Taylor (head of refrigeration service at Kalos), and Joe Shearer (with Precision Air Conditioning). The conversation kicks off by busting some common myths surrounding expansion valves. The guests agree that minutiae like the precise clocking (rotational orientation) of the sensing bulb or...
Q&A - How to Learn Superheat & Subcooling - Short #191
April 09, 2024 11:00 - 7 minutes - 10.7 MBIn this short podcast episode, Bryan answers an audience member's question and explains how to learn superheat & subcooling, two fundamental aspects of the HVAC/R trade. You can submit questions of your own at https://www.speakpipe.com/hvacschool. Saturation is when a substance is in the liquid and vapor state in the same place. Eugene Silberstein likes to help us envision it by encouraging us to think of a horizon line on the ocean; anything below it is fully liquid (subcooled, what a su...
Focus of Your Goals w/ Refrigeration Mentor
March 28, 2024 11:00 - 44 minutes - 61 MBIn this episode of the HVAC School Podcast, Bryan Orr and Trevor Matthews delve into the importance of setting goals, focusing on them, and taking actionable steps to achieve them. They emphasize that goal-setting is crucial for personal and professional growth and that it requires introspection, prioritization, and sacrifice. Trevor shares his experience of setting a goal to buy his first house and how writing down the specifics, such as the number of bedrooms and bathrooms, helped him ac...
When to Switch to Emergency Heat? - Short #190
March 26, 2024 12:00 - 7 minutes - 11 MBIn this short podcast episode, Bryan talks about when to switch to emergency heat. He talks about coefficient of performance (COP) and how it's a deciding factor when to run emergency heat, which is when a system ONLY runs the backup heat; it doesn't use it as supplementary heat. When we have a heat pump with backup electric heat, we shouldn't ever rely just on emergency heat; we want the heat pump to run. Electric heat is just designed to supplement the heat pump's heating because it's in...
Manual J in 15 Minutes?
March 21, 2024 12:00 - 38 minutes - 53.5 MBShelby Breger, co-founder of Conduit Tech, joins Bryan Orr on the HVAC School Podcast to discuss her company's innovative lidar-enabled design and sales software tool for HVAC contractors. Conduit Tech's software utilizes lidar sensors in iPads and iPhones to scan homes and create 3D models and 2D floor plans. It overlays load calculations factoring in property data, orientation, cooling/heating degree days, and building materials. This allows contractors to perform detailed load calculati...
Combustion Venting Categories - Short #189
March 19, 2024 12:00 - 8 minutes - 11.6 MBIn this short podcast episode, Bryan talks about the four different combustion venting categories for gas appliances as set by ASHRAE and where you'll see them. He also shares some notes about pressurization. These categories deal with the pressurization and temperature ranges of the vents. Category 1 venting is used for old-school open-combustion gas furnaces; they have high flue gas temperatures and are considered low or mid-efficiency furnaces. This venting category is not positively pr...
The Gift of Security and Learning w/ Jennifer Manzo
March 14, 2024 12:00 - 36 minutes - 49.8 MBIn this episode of the HVAC School Podcast, host Bryan Orr speaks with Jennifer Manzo, founder of HVA-Chicks Coalition. Jennifer shares her unique background as a longtime teacher and homeschooler who stumbled into the HVAC trade while researching vocational options for her homeschooling students. They discuss the inspiration behind HVA-Chicks, a free training coalition offering technical, career, and personal support to women in HVAC. This includes customized training plans, connecting me...
Belt Talk - Short #188
March 12, 2024 12:00 - 10 minutes - 15.1 MBIn this short podcast episode, Bryan dives into some belt talk, including some bits about pulleys and sheaves. He also shares some belt tensioning tips for your next commercial HVAC job. Belts are less common than they used to be, but we find them in ventilation fans, RTUs, and AHUs. Squealing belts indicate slippage, which indicates fan inefficiency and energy losses. Belts transmit energy from the motor (pulley) to the fan or blower wheel being driven by it. Motor mounts may be adjustabl...
Using the Roomulator w/ Chris Hughes
March 07, 2024 12:00 - 44 minutes - 61.8 MBIn this episode of the HVAC School Podcast, host Bryan Orr speaks with Chris Hughes of The Energy Conservatory (TEC) about using the Roomulator card and DG-8 manometer for room pressurization testing. Chris provides background on how he came up with the idea for the Roomulator. He wanted an easy way for technicians to properly size passive returns to relieve pressure imbalances between bedrooms and the main body of a home. The Roomulator card enables technicians to quickly measure door und...
Primary & Secondary Air in Combustion - Short #187
March 05, 2024 12:00 - 6 minutes - 9.76 MBIn this short podcast, Bryan dives into a gas heating topic: primary & secondary air in combustion. Primary air is the air and oxygen content that enters the furnace BEFORE combustion. In older furnaces, prior to induced combustion, air was drawn in through the front. These older furnaces had adjustable shutters that we could modify to bring in more or less primary air based on our combustion analysis readings. We could also use flame color to get an idea of the CO content (yellow tips on ...
Learning Outside the Box (Live Rebroadcast)
February 29, 2024 12:00 - 1 hour - 83.7 MBThis podcast episode is a live rebroadcast of a livestream with Craig Migliaccio (AC Service Tech) and Ty Branaman (love2hvac). It focuses on different types of learning and how to make the most out of learning experiences. The hosts discuss the differences between random learning, goal-driven learning, and forced learning. Random learning involves casually exposing yourself to new information without a specific end goal. It can be useful for sparking curiosity. Goal-driven learning is foc...
Making Family Business Work w/ Leilani Orr
February 22, 2024 12:00 - 35 minutes - 48.8 MBIn this podcast episode, Bryan has an enjoyable conversation with his wife Leilani about navigating family relationships while building a business. They discuss the challenges and benefits of mixing family and work, setting boundaries, and maintaining perspective. Bryan starts by admitting he felt intimidated to have Leilani on the podcast before, joking about her “big muscles and dominating presence.” Leilani jokes back, saying Bryan seems less intimidated now that they’ve been together s...
Heat Pump Basics in Plain Language
February 15, 2024 12:00 - 26 minutes - 36.9 MBIn this solo podcast, Bryan provides an introduction to heat pumps, explaining the basics of how they work and key considerations in a way that is easy for anyone to understand. He starts by reviewing some core HVAC principles - that heat moves from higher temperatures to lower temperatures, the three main methods of heat transfer, and the concept that temperature is really just a measure of molecular movement. He then explains that a heat pump works by taking heat from a place that doesn'...
Women in HVAC (Live Rebroadcast)
February 08, 2024 12:00 - 52 minutes - 72.9 MBThis podcast brought together several women working in the HVAC industry to discuss their experiences and offer advice. The conversation focused on the positives of working in HVAC as a woman, the importance of community, and the resources available. The women talked extensively about how welcoming and supportive the HVAC community, and particularly HVAC men, have been towards them. Several got into the industry because of their husbands' work. They agreed the perception that it's difficul...
History of AWG - Short #186
February 06, 2024 12:00 - 8 minutes - 12.1 MBIn this short podcast, Bryan explains the history of AWG, or American wire gauge, which is the sizing system we use for conductors in the United States. Wires weren't standardized before the 18th century (1700s). As fencing, telegraph, and electrical wires started coming out, there was a need for a standardized system. In England, a standardized system called the Birmingham wire gauge (BWG) was developed in the 1800s. The American Telegraph Company developed the American equivalent, the AW...
A2L Update With Chemours Live from AHR
February 01, 2024 12:00 - 34 minutes - 47.1 MBDon Gillis and Dr. Chuck Allgood from Chemours join the show to discuss their new easy as "1,2,3" branding around the A2L refrigerants R454A, R454B, and R454C. They explain that A2Ls are not actually flammable like hydrocarbons; they are just mildly combustible with much lower burning velocity and energy than propane or butane. The key is that A2L refrigerants can only be used in equipment specifically designed and tested for them. They outline several equipment changes, like the inclusion...
What is DX? - Short #185
January 30, 2024 12:00 - 5 minutes - 8.05 MBIn this short podcast episode, Bryan tackles the following question: What is DX? In short, DX stands for "direct expansion," which means that you cool the end product via the refrigeration cycle. We blow air over an evaporator coil, which allows the refrigerant to take up heat from the air and directly expand. Chillers, boilers, and chilled water systems are NOT direct expansion systems; they use a secondary fluid like water or glycol to move the heat throughout the structure, not an evap...
Vacuum and Recovery in an A2L World with Jesse Stewart
January 24, 2024 22:00 - 28 minutes - 40 MBIn this podcast, Bryan Orr interviews Jesse Stewart from NAVAC about A2L refrigerants and compatible tools and safety procedures. They discuss how NAVAC has a full line of A2L-compatible tools for evacuation and recovery, including the new NR7 and upgraded models of the NRDDF and NRDD. Jesse explains key features that make tools A2L compatible, like DC motors, sparkless designs, insulated electrical terminations, soft power switches, and fans. He notes that NAVAC has been designing tools t...
Safe Chemicals are Good Chemicals w/ Mike Pastorello
January 24, 2024 20:00 - 24 minutes - 34.6 MBThis podcast covers refrigeration technologies' growth and focus on providing safe, high-performing chemicals for HVAC technicians without hazardous ingredients. Mike Pastorello discusses the 2017 rebranding that gave their products a more modern, cohesive look. He also talks about bringing on new marketing talent like Ashley and Becca to amp up refrigeration technologies' social media presence and connect more directly with end users. Throughout, Mike emphasizes enabling the marketing exp...
How Better Truck Stock Makes the Trade Better w/ Jim Fultz
January 24, 2024 15:00 - 47 minutes - 65.6 MBThis live podcast from AHR Expo 2024 discusses the costs of truck rolls for HVAC technicians and how technicians and companies can reduce those costs. Jim and Bryan highlight that every time a tech has to go to the supply house to get parts, the company loses money in potential service calls that could have been completed. They emphasize stocking trucks properly so that technicians can complete repairs efficiently without leaving jobsites. Jim talks about the White Rogers 50M56X8-43 univer...
The VCRT Redesigned + More w/ Fieldpiece
January 24, 2024 01:30 - 29 minutes - 41.3 MBIn this podcast, Bryan chats with Tony Gonzalez of Fieldpiece about their latest innovations for service tools, including the redesigned VCRT, as well as the training resources they offer. They start off discussing Fieldpiece's philosophy of developing solutions for technicians' real pain points, not just making products. Understanding workflows and obstacles lets them design better tools. Tony then reveals their new line of valve core removal tools aimed at faster, easier access to system...
Absolute vs. Gauge Pressure (Micron Gauge vs. Manometer) - Short #184
January 23, 2024 12:00 - 10 minutes - 15.3 MBIn this short podcast episode, Bryan covers the differences between absolute and gauge pressure, as well as measuring pressure with a micron gauge or a manometer. Compression ratio deals with absolute suction and absolute discharge pressures. Absolute pressure requires us to add atmospheric pressure to the gauge pressure. We usually measure gauge pressure in pounds per square inch (PSI). PSIG is the gauge pressure (zeroed to atmospheric pressure), and PSIA is the gauge pressure plus the at...
Is Dual Fuel the Answer? w/ Tom Buescher
January 18, 2024 12:00 - 37 minutes - 52.3 MBIn this HVAC School podcast, Bryan and Tom Buescher with Copeland discuss dual-fuel heat pump systems as an intermediate step towards more sustainable heating solutions. They talk about the overall goal of reducing greenhouse gas emissions from residential heating and cooling, which accounts for over half of home energy use. While heat pumps can provide higher efficiency, simply switching everyone to electric isn’t realistic in the short term. Factors like grid capacity, infrastructure, an...
NTC, PTC and Thermocouples - Short #183
January 16, 2024 12:00 - 7 minutes - 10.9 MBIn this short podcast episode, Bryan dives into NTC, PTC, and thermocouples. NTC and PTC are two types of thermistors, and all three tools are used to sense temperature. Thermistors are resistors that change their resistance based on a change in temperature. They must be powered, and the resistance changes the amperage. You can test a thermistor with an ohmmeter at a fixed temperature. The best temperature for testing is the thermistor's rated temperature, typically 77 degrees Fahrenheit. ...
How to Save Energy with Grocery Store Refrigeration
January 11, 2024 12:00 - 43 minutes - 59.5 MBThis podcast episode focuses on practical ways to save energy with grocery store refrigeration systems, with Matthew Taylor from Kalos Services sharing insights from both a technician and business owner perspective. The hosts emphasize that proper, consistent operation and preventing short cycling of compressors can have a major impact as the largest power consumers. Proper control strategies, like ensuring evaporator pressure regulators (EPRs) are working, maintaining subcooling, and prev...
An ACCA Form You Probably Never Heard Of w/ Ed J.
January 04, 2024 12:00 - 28 minutes - 39.2 MBThe podcast is a conversation between Ed and Bryan about using the ACCA Residential Plans Examiner Review Form, an ACCA form you probably never heard of, to demonstrate that proper HVAC system design procedures were followed based on the Manual J, Manual S, and Manual D guidelines. Ed introduces the Residential Plans Examiner Review Form as a one-page document that allows contractors to show they gathered the minimum necessary information to complete a proper HVAC system design. The form d...
Solving & Preventing Oil Issues in Rack Refrigeration
December 28, 2023 12:00 - 49 minutes - 68.4 MBIn this HVAC podcast episode, hosts Bryan Orr and Matthew Taylor (refrigeration leader and trainer at Kalos Services) discuss oil management and considerations in supermarket refrigeration systems, with a focus on solving & preventing oil issues. They talk about the importance of stable system operation and how oil flows through both active and passive systems in these larger built-up racks. Matthew explains that in a rack system, oil is actively separated and returned to the compressors t...
What is A2L Mitigation Going to Look Like? w/ Clifton B.
December 21, 2023 12:00 - 38 minutes - 53.6 MBIn this podcast, Bryan and Clifton discuss the upcoming transition to A2L refrigerants, like R-32 and R-454B, and what A2L mitigation is going to look like. These mildly flammable refrigerants will be used in place of R-410A for residential air conditioning systems due to an HFC phase-down driven by legislation and international agreements. They explain what mitigation means with A2L systems - sensors will detect refrigerant leaks, and the system will shut off and turn on the blower fan to...
Healthy Air Supplements vs. Pillars w/ Kevin Hart
December 14, 2023 12:00 - 43 minutes - 59.6 MBBryan and Kevin discuss indoor air quality solutions in terms of healthy air supplements vs. pillars of IAQ, drawing an analogy between IAQ supplements like electronic air cleaners and fitness supplements. They talk about why discussing these supplemental products can be controversial since many companies profit from selling them. However, the fundamentals of good IAQ - ventilation, filtration, and humidity control - are proven to work well, just as diet, exercise, and hydration promote good...
Hot Deck, Cold Deck - Short #182
December 12, 2023 12:00 - 10 minutes - 15 MBIn this short episode, Bryan discusses the unique features of hot deck, cold deck systems. These systems have separate heating and cooling components (if not entire systems). Older systems may have completely separate duct systems: one for heating and one for cooling. These ducts would go to each space, and you'd essentially have twice the ductwork you'd expect nowadays. Some systems also have a separate hot deck and cold deck in a single appliance (a bit like gas furnaces with case coils)...
Common Callbacks and Failed Inspections on Install
December 07, 2023 12:00 - 51 minutes - 70.3 MBIn this episode of HVAC School, hosts Bryan Orr and Bert discuss practical tips for preventing callbacks and failed inspections in residential HVAC installs and maintenance. Bryan and Bert stress the importance of getting the basics right, like properly cleaning condensate drains, ensuring proper drain pitch, and sealing ducts completely before relying on tapes and mastic to cover gaps. They emphasize verifying full system operation at the end of a job, from checking that drains flow freel...
When Permits Are Not Needed - Short #181
December 05, 2023 12:00 - 6 minutes - 9.14 MBIn this short episode, Bryan talks about the situations when permits are not needed to install HVAC/R (or HVAC/R-related) components. A few codes are universal in residential HVAC, including the International Residential Code (IRC) and the International Mechanical Code (IMC). The local municipality, also known as the authority having jurisdiction (AHJ), chooses which codes to adopt. You do not need a permit to install plug-in, cord-connected appliances. However, you need UL-listed plugs...
What's Different About Pool Heaters w/ Bert
November 30, 2023 12:00 - 46 minutes - 64 MBIn this podcast, Bryan Orr and Bert discuss various aspects of pool heaters, focusing on issues that make them different from typical HVAC systems. They cover the basics of pool heaters - the main types (heat pumps and gas heaters) and how they operate similarly or differently from things HVAC techs work on regularly. The bulk of the 45-minute podcast looks at common service and troubleshooting situations with pool heaters, which are usually installed by pool contractors initially and not ...
Farads, Micro and Pico - Short #180
November 28, 2023 12:00 - 8 minutes - 11.3 MBIn this short episode, Bryan explains the fundamentals of capacitance, focusing on the unit of measure: farads, including micro and pico. Farads are named after scientist Michael Faraday and measure capacitance; one farad represents the capacitance of a capacitor in which one coulomb of charge causes a potential difference of one volt across the plates. Farads measure the storage of electrical energy and indicate the capacitor's ability to create a phase shift. Since farads are large uni...
All About 90% Furnaces
November 23, 2023 12:00 - 1 hour - 82.8 MBBryan Orr hosted a live podcast discussion all about 90% efficient furnaces with HVAC professionals Ty Branaman, Adam Mufich, and Matthew Bruner. They covered the basics of how 90% furnaces work compared to traditional 80% furnaces, troubleshooting tips, and best practices for installation and service. A key difference with 90% furnaces is the addition of a secondary heat exchanger that extracts more heat from the exhaust gases before they go out the flue. This allows the furnace to achiev...
Analog vs. Digital Sine - Short #179
November 21, 2023 12:00 - 7 minutes - 11 MBIn this short podcast, Bryan breaks down the differences between analog and digital sine waves. Analog readings deal with an unlimited number of values; they are very precise and can have any number of decimals. As a result, the alternating current (AC) analog sine readings have very smooth curves when we read them on an oscilloscope (in the US, we see 60 peak-and-valley cycles per second because the frequency is 60 hertz). Variable frequency drives (VFDs) and ECMs work with digital out...
Why and How of Combustion Analysis w/ Tyler Nelson
November 09, 2023 12:00 - 1 hour - 84.6 MBBryan Orr interviews Tyler Nelson, an HVAC expert with over 20 years of experience as a contractor. They have an in-depth discussion about combustion analysis and why it is becoming increasingly important for HVAC technicians to utilize this process. The conversation provides an overview of combustion analysis benefits and why HVAC pros should incorporate it into their standard operating procedures. Tyler offers insightful perspectives from his decades of contracting experience, including ...
Checking a Heat Pump in Heat Mode - Short #178
November 07, 2023 11:00 - 14 minutes - 20.3 MBIn this short podcast, Bryan talks about checking the charge of a heat pump in heat mode. This skill will become more critical as ambient temperatures get cooler. The most reliable way to check and set the charge regardless of operating mode and season is to weigh the charge. This method is most practical during installation and commissioning, and proper commissioning can prevent issues with charge levels later. Weighing the charge is recommended for big repairs, like major component repla...
An IAQ & Dehum Case Study w/ Genry & Nikki
November 02, 2023 11:00 - 54 minutes - 74.4 MBNikki Krueger and Genry Garcia return to the podcast to talk about a recent IAQ & dehumidification case study on a vintage home in Miami. The home was very clean but had a musty odor and VOC concerns. You can read the case study in the “Literature” section at https://www.santa-fe-products.com/about-us/media-resources/ or https://hvacrschool.com/case-study. Blower door tests and ZPD revealed that the home was leaky, and the crawlspace was also not properly encapsulated. The options were to...
Creating a Business Where Everyone Wins w/ Tommy Mello
October 26, 2023 11:00 - 50 minutes - 69.1 MBSkilled trades entrepreneur Tommy Mello joins the podcast to talk about creating a business where everyone wins: business owners, employees, vendors, AND customers. Tommy's main motivations in business are relationship-building and helping employees make a good living. Those motivations contribute to the development of company culture; even though cultures build themselves naturally, developing the right leaders will help build a positive company culture that values all employees equally. ...
Tips for Supermarket Rack Service w/ Trevor
October 19, 2023 11:00 - 49 minutes - 67.7 MBRefrigeration Mentor Trevor Matthews returns to the podcast to share some of his tips for supermarket rack service. The supermarket refrigeration world is ripe with high-paying opportunities and uses similar skills that HVAC technicians use daily. Switching from HVAC to refrigeration will require a little bit more attention to some new components, especially controls and control systems. Technically-minded people tend to do well in the refrigeration field regardless of where they come from...
Traps, Vents & Drains - Short #177
October 17, 2023 11:10 - 8 minutes - 12.3 MBIn this short episode, Bryan covers traps, vents, and drains. He explains some common misconceptions and best practices for fabricating drains, especially in residential and light commercial structures in Florida. Cleanouts and vents are commonly confused with each other, and people often cap vents and leave cleanouts open. However, cleanouts (which must be capped) will always be before the trap, and vents come after the trap. When you have an indoor air handler, furnace, or fan coil, vent...
Cracking the Home Health Comfort Code: IAQ’s Illusory Ideals
October 12, 2023 11:00 - 38 minutes - 53 MBHAVEN IAQ founder and CEO Kevin Hart returns to the podcast to discuss cracking the home health comfort code, diving into IAQ’s illusory ideals. Even though the industry has been generating well-thought solutions to common problems, it’s difficult to put those solutions into practice on a large scale. As a result, it’s common to rely on selling “bolt-on” IAQ products, which don’t actually solve systemic IAQ problems. HAVEN’s recent work has also shown that only a few HVAC technicians are p...
Tubing Insulation Tips - Short #176
October 10, 2023 11:00 - 11 minutes - 16.5 MBIn this short podcast episode, Bryan goes over a few tubing insulation tips. Tubing insulation is also commonly known as Aeroflex, Armaflex, and Thermaflex—all brand names for black copper line set insulation. We typically have to insulate just the suction line in typical residential split HVAC systems, but you'll typically have to insulate both lines in ductless/VRV/VRF or refrigeration applications. The insulation should be on the tubing before brazing, gluing the ends together (only usi...
The New HSI Module from White Rodgers
October 05, 2023 11:00 - 39 minutes - 54.1 MBJim Fultz returns to the podcast to talk about the new HSI module from White-Rodgers, the 50E47U-843. You can learn more about this new universal HSI module at https://hvacrschool.com/hsimodule. Hot surface ignition modules control the burner for gas appliances that use hot surface ignition, not just furnaces. Since the HSI module doesn't need to work with a blower fan, it can be used in water heaters, pool heaters, and many more appliances that don't primarily move air (except for combus...
Locked Compressors and Hard Starts - Short #175
October 03, 2023 11:00 - 14 minutes - 20.3 MBIn this short podcast episode, Bryan talks about locked compressors and hard starts. He explains what actually happens when a compressor locks and covers when and how to use hard starts appropriately. Locked compressors are compressors that trip on overload during startup; they're considered "locked" because the rotor doesn't turn inside the stator and generates heat instead. The overload opens, but the compressor shell typically does not heat up very much when the overload opens. When...
Residential Exhaust Codes and Best Practices
September 28, 2023 11:00 - 57 minutes - 78.8 MBLicensed mechanical engineer Tony Amadio joins the podcast to talk about residential exhaust codes and best practices. He also put together a presentation about the topic, which you can view at https://hvacrschool.com/exhaust. When choosing duct materials for residential exhaust, you will want to stick to sheet metal and mind the gauge; flex ductwork can easily be damaged and will rack up a high total equivalent length in a way that sheet metal will not. Exhaust air should always discha...
Wiring Refrigerated Cases w/ Nathan & Phil
September 14, 2023 11:00 - 44 minutes - 60.9 MBPhil Barr and Nathan Orr join the podcast to talk about wiring refrigerated cases in commercial spaces, including convenience stores and supermarkets. Cases may be medium-temp (or high-temp, in some cases) or low-temp. Medium-temp cases can typically defrost on their own during the off cycle, and low-temp cases may have electric or hot-gas defrost to help get ice off the coil at set intervals. Each system has an evaporator (and fans), compressor, condenser, and metering device (often a TXV...