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.
Homepage Apple Podcasts Google Podcasts Overcast Castro Pocket Casts RSS feed
Episodes
Flame "sensing" - Short 136
December 21, 2021 12:00 - 11 minutes - 16.6 MBIn this short podcast, Bryan explains the basics of flame sensing, also known as flame rectification. Flame sensing/rectification is a form of proving flame. When you can’t prove flame, your furnace might be dumping unspent gas into the heat exchanger, which can cause an explosion. Flame sensing rods are common in hot-surface (HSI) and intermittent-spark (ISI) ignition. These rods stick out into the flame and connect to the furnace board. The flame creates a path between the rod and grou...
Grow a Business Through Customer Experience - Throwback Bonus
December 16, 2021 12:00 - 35 minutes - 49.6 MBThis podcast episode is a throwback to one of Bryan’s first small business podcasts. In this old episode, Australian electrician and businessman Joshua Nicholls explains how he built a business by focusing on customer experience and branding. Bryan grew Kalos similarly, so they talk about the journey of going from “man-in-a-van” businesses to larger businesses with several employees. Joshua wanted to bring old-school manners and integrity to the business world, and that’s how he brande...
Refrigeration Defrost Termination & Fail Safe - Short 135
December 14, 2021 12:00 - 9 minutes - 13.7 MBIn this short podcast episode, Bryan covers the differences between defrost termination and failsafe. He also covers the basics of defrost in refrigeration applications. In medium-temp applications (also called coolers), the box stays above freezing temperatures, but the coil may drop below freezing. When the air is above freezing, we can use off-cycle defrost. The coil defrosts when the system naturally cycles off. We may also use timed defrost, which pumps down or cycles the compress...
Intro to Project Management - Throwback Bonus
December 09, 2021 12:00 - 30 minutes - 42.5 MBThis podcast episode is a throwback to one of Bryan’s first podcasts about small businesses. Cesar Abeid, former VP of construction camera company Remontech, joined this podcast to discuss the basics of project management and a book that can help you step into that side of the business. Project management is a framework or set of tools to turn an idea into reality. Projects have a beginning and end to create something new, and project management is how we get from the beginning to the end ...
Dealing with Imposter Syndrome - Short 134
December 07, 2021 12:00 - 10 minutes - 15 MBBryan discusses impostor syndrome, what it is, and how it may actually be useful for us. When we feel that we’re frauds and that others wouldn’t like to be led by us if they knew how much we don’t know, we’re experiencing impostor syndrome. Contrary to what others might believe, impostor syndrome isn’t all that bad and may even be necessary for a healthy self-image. On the other side, we have the Dunning-Kruger effect, which is when people are confident in the things they have very littl...
Transforming Grocery and Cold Storage with Data
December 02, 2021 12:00 - 43 minutes - 59.7 MBAmrit Robbins of Axiom comes on the podcast to discuss how we can use data science to transform grocery and cold storage. Axiom Cloud uses cloud analytics and AI to map data and analyze trends on refrigeration racks. It can be particularly useful to keep track of readings all the time because it’s impractical to rely on a human to take and record readings 24/7. Grocery stores are unique because they have so much product at stake and are relatively inflexible in their usage of energy. If ...
Superheat Talk - Short 133
November 23, 2021 12:00 - 14 minutes - 20.3 MBIn this short podcast, Bryan goes over the basics of superheat and explains why it matters to us. Superheat is the temperature increase above a substance’s saturation temperature or boiling point. When a substance is superheated, that means it is 100% vapor; there is no liquid at all. We can look at our superheat to determine how much refrigerant is feeding our evaporator coil. A lower superheat indicates that our evaporator is more full of refrigerant than a high superheat, meaning that...
Liquid Quality vs. Subcooling
November 18, 2021 12:00 - 30 minutes - 41.7 MBIn this podcast episode, Bryan and Eric Mele talk about sight glasses, the significance of subcooling in refrigeration, and liquid quality. While we measure subcooling quite often in HVAC work, we rely on sight glasses and liquid line receivers far more often in refrigeration. You need a sight glass to determine the liquid quality in a refrigeration system. Subcooling is one way to assure liquid quality without a sight glass or a receiver. Subcooling refers to the temperature drop below...
Aluminum Repair Tips - Short 132
November 16, 2021 12:00 - 12 minutes - 18.1 MBIn this short podcast, Bryan explains the basics of repairing aluminum, such as on coils or tubing. Repairing aluminum can save lots of time on mission-critical calls and can help stop refrigerant leaks that lead to ozone layer depletion or global warming. Soldering makes almost all of the aluminum repair work we will do. (Brazing is possible, as aluminum has a melting point of 1200 degrees, but that’s still a bit too close to the brazing threshold.) When working with aluminum, we need ...
Specifically About Heat - Short 131
November 09, 2021 12:00 - 12 minutes - 17.2 MBIn this short podcast, Bryan goes over energy transfer and heat, specifically specific heat. BTUs per ton is a common measurement; a BTU (British thermal unit) is the amount of heat it takes to raise the temperature of one pound of water by one degree Fahrenheit. 12,000 BTUs per hour is equal to one ton in heating or cooling technology. It takes one “ton” of heat to melt a ton of ice, but we kept the measurement and terminology as we moved away from using ice in industrial refrigeration. ...
Pressure Measurement Pro Tips w/ Steve Rogers
November 04, 2021 11:00 - 35 minutes - 49.7 MBIn this podcast, Steve Rogers from The Energy Conservatory explains some pro tips for pressure measurement. There are three common types of pressure measurements: absolute, gauge, and differential. Absolute pressure is the pressure in a particular space in reference to a complete vacuum. (All absolute measurements use the zero point as a reference.) Gauge pressure uses atmospheric pressure as a reference point (which varies with altitude and location). Differential pressure relies on two c...
Copeland Reciprocating CS Compressors w/ Trevor
October 28, 2021 11:00 - 56 minutes - 78.3 MBTrevor Matthews from Refrigeration Mentor comes on the podcast to talk about Copeland reciprocating CS compressors. He and Bryan cover Bulletin AE4-1433 (found HERE) as they look at the operating envelopes for the CS compressor. The CS compressors are hermetic reciprocating compressors that can work with some of the newer refrigerants. You will likely see these compressors in applications with smaller tonnages. You’ll usually want to charge these compressors with liquid refrigerant. If y...
Adiabatic Cooling - Short 130
October 26, 2021 11:00 - 11 minutes - 16.1 MBIn this short podcast episode, Bryan explains the science behind adiabatic cooling. Adiabatic cooling occurs in specific HVAC/R applications and in our environment as air temperatures and pressures change. When we think of cooling, we refer to the loss of heat; we are either referring to the change in the total BTU content of the air mass or the temperature change. Adiabatic cooling takes sensible heat and transforms it into latent heat. The most simple forms of adiabatic cooling can be ...
Fighting Boredom at Work - Short 129
October 19, 2021 11:00 - 14 minutes - 19.6 MBIn this short podcast episode, Bryan shares his top tips for fighting boredom at work. You can use these tips to help you get out of a rut if you don’t feel productive or get bored easily. The first tip for fighting boredom is to see the art or creativity in your work. Even in the HVAC industry, there are plenty of opportunities for artisan skills and craftsmanship. When you see your work as an art that you need to refine, it’s easier to get engaged in your work and feel proud of it. That'...
Review Of Vacuum For Service Revisted
October 14, 2021 11:00 - 25 minutes - 34.8 MBIn this podcast episode, Bryan goes through the addendum to the book Review of Vacuum for Service Engineers. He and Jim Bergmann had the honor of revising the latest edition in 2020. You can get the latest edition of Review of Vacuum for Service Engineers from TruTech Tools HERE. Pulling a Schrader core before evacuation makes a big difference in the speed of the evacuation. You can use a core remover tool to pull the cores when the system is NOT pressurized. There are three common types...
Electric Heat - Short 128
October 12, 2021 11:00 - 12 minutes - 18 MBIn today’s short podcast, Bryan discusses electric heat, how we use it in our work, and what it does. Also called heat strips or heat elements, electric heat is a supplemental heat source that we usually see on heat pumps. We generally see them in fan coils within a cartridge or a kit at the top of an air handler. However, not all systems have backup heat. We want to avoid running electric heat as much as possible because it is inefficient. There is almost nothing we can do to make heat ...
Introducing Refrigeration Mentor w/ Trevor
October 07, 2021 11:00 - 24 minutes - 34.1 MBTrevor Matthews comes on the podcast to discuss his newest project, Refrigeration Mentor. Refrigeration Mentor uses Trevor’s experience as a trainer and field technician to guide others in their careers. Trevor’s goal is to help commercial refrigeration technicians grow and become more confident in their skills. He wants them to become the best technician they can be, and he believes that mentorship is one of the things that make our industry great. Mentorship can help people advance their...
Effective IAQ Measurement & Control w/ Haven
October 05, 2021 11:00 - 48 minutes - 66.5 MBIn this podcast, Ben from HAVEN IAQ, Kaleb, and Bryan discuss how to control indoor air quality and take effective, meaningful, accurate measurements. HAVEN is a platform that offers hardware and software delivered to a homeowner through an HVAC professional. HAVEN’s goal is to give its customers a healthier, more comfortable home using IAQ solutions. The hardware (controls, etc.) works with the HAVEN software to give customers and contractors data about IAQ and the performance of the HV...
College vs. Skilled Trades w/ Ryan Gorman
September 30, 2021 11:00 - 39 minutes - 54 MBRyan Gorman comes on the podcast to discuss the differences between a college education and early career opportunities in the skilled trades. Many parents feel pressured to send their children to college and encourage them to get a four-year degree. Despite what society may lead us to believe, there is no shame in thinking that college may not be suitable for you or your child; the skilled trades have many opportunities for people to learn throughout their lives and make a good living. I...
College vs. Skilled Trades W/ Ryan Gorman
September 30, 2021 11:00 - 39 minutes - 54 MBRyan Gorman comes on the podcast to discuss the differences between a college education and early career opportunities in the skilled trades. Many parents feel pressured to send their children to college and encourage them to get a four-year degree. Despite what society may lead us to believe, there is no shame in thinking that college may not be suitable for you or your child; the skilled trades have many opportunities for people to learn throughout their lives and make a good living...
A2L Refrigerant Facts w/ Jason Obrzut
September 23, 2021 11:00 - 39 minutes - 54.4 MBJason Obrzut comes on the podcast to discuss A2L refrigerant facts. Jason is a member of AHRI’s Safe Refrigerant Transition Task Force and author of the RACT manual. ASHRAE designates refrigerants into categories based on toxicity (A or B) and flammability (traditionally 1, 2, and 3). So, the new A2L designation indicates that a refrigerant is relatively non-toxic but has a flammability value between 1 (low) and 2 (moderate). While propane (R-290) is a good refrigerant because it is natura...
Dealing with Difficult People at Work
September 16, 2021 11:00 - 1 hour - 139 MBIn today’s podcast, Bryan and some Kalos employees discuss how to deal with difficult bosses and coworkers in HVAC/R work. Whether your coworkers have anger issues, are careless, or are miserable people, you don’t want that negativity to affect your job satisfaction. Addressing the behavior may likely help, but you don’t want to attack the other person. The key to dealing with difficult coworkers is to communicate boundaries respectfully with the goal of improving the work environment. Bou...
The ACCA Manuals w/ Ed Janowiak
September 09, 2021 11:00 - 53 minutes - 74.4 MBIn today’s podcast, Ed Janowiak comes onto the podcast to talk about the Air Conditioning Contractors of America manuals. Ed started off in the field and has recently become the new Manager of Design Education at ACCA. You can follow him on Snapchat (skinnyed). ACCA (Air Conditioning Contractors of America) is responsible for publishing and setting the standards in all of the books we use for residential and light commercial HVAC work. (Residential work typically encompasses Manuals J, S, ...
Money Conversations for Techs
September 02, 2021 11:00 - 1 hour - 150 MBIn today’s podcast, Bryan and Jesse talk about how technicians can have conversations about finances and money in the HVAC business. The first step for any successful business is to provide customers/clients with a product or service of value. However, there must be a balance between providing something of value to customers and providing excellent customer service. When starting an HVAC business, one of the biggest mistakes is making money the top priority. Money can only become a facto...
Sleeve vs. Ball Bearings - Short 127
August 31, 2021 11:00 - 5 minutes - 8.45 MBIn today’s short podcast, Bryan explains the differences between sleeve and ball bearings. Techs often make some avoidable mistakes because they either don’t know the difference between the two or don’t notice the bearing type on their equipment. On a basic sensory level, ball bearings tend to be louder than sleeve bearings. So, if you replace a sleeve bearing motor with a ball bearing motor, then excess noise may not indicate any problems after all. Lubrication is usually more consistent ...
Horizontal Scroll Compressors w/ Trevor
August 26, 2021 11:00 - 41 minutes - 57.8 MBIn today’s podcast, Trevor Matthews from Emerson talks about horizontal scroll compressors. Throughout the podcast, we refer to Bulletin AE4-1338 (R3). You can find that bulletin HERE. Horizontal scroll compressors are common in mobile applications, like buses and trains. They’re shorter in height than other compressors, so they fit into tighter spaces and are ideal for transport refrigeration. Scroll compressors are particularly susceptible to overheating, and you need some controls to...
Buck & Boost Autotransformers - Short 126
August 24, 2021 11:00 - 11 minutes - 15.5 MBIn 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 vo...
An Effective IAQ Process w/ John Ellis
August 19, 2021 11:00 - 57 minutes - 79.8 MBIn 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)...
Caring for Technician Mental Health
August 18, 2021 01:47 - 1 hour - 91.4 MBIn 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 ...
Troubleshoot the System! w/ Jim Bergmann
August 12, 2021 11:00 - 57 minutes - 79.4 MBIn 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 unconditio...
How to Measure Total System Airflow w/ Steven
August 05, 2021 11:00 - 50 minutes - 69.7 MBIn 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, esp...
HVAC/R Career Advancement - Short 125
August 03, 2021 11:00 - 18 minutes - 26 MBIn 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...
Mini-Split Controls Strategy w/ METUS
July 29, 2021 11:00 - 47 minutes - 66.1 MBIn 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 comm...
Key System Performance Factors - Short 124
July 27, 2021 11:00 - 13 minutes - 19.1 MBIn 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 CF...
Copeland Scroll Compressor Multiples for Air Conditioning w/ Trevor
July 22, 2021 11:00 - 30 minutes - 42.4 MBIn 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...
Margin, COGS, Markup & Profit Confusion - Short 123
July 20, 2021 11:00 - 11 minutes - 16.3 MBIn 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 (C...
Planning and Layout of HVAC Projects
July 15, 2021 11:00 - 48 minutes - 67.5 MBIn 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 eve...
Startup vs commissioning - Short 122
July 13, 2021 11:00 - 10 minutes - 15.1 MBIn 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 ...
How to Make Mentorship Work w/ Eric Kaiser
July 08, 2021 11:00 - 52 minutes - 71.9 MBIn 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 tha...
Alternatives for College That Parents Should Consider
July 01, 2021 11:00 - 56 minutes - 77.5 MBIn 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...
Triple Evacuation - Short 121
June 29, 2021 11:00 - 10 minutes - 15 MBIn 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 mic...
How to Teach the Physics of Everyday Life
June 24, 2021 11:00 - 53 minutes - 73.7 MBIn 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 b...
Be Careful With Cold Tanks - Short 120
June 22, 2021 11:00 - 7 minutes - 10.7 MBIn 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 pr...
Dehumidification Facts w/ Nikki
June 17, 2021 11:00 - 52 minutes - 73 MBIn 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), a...
TXV Troubleshooting w/ Trevor
June 10, 2021 11:00 - 50 minutes - 68.9 MBIn 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 com...
Push Pull Recovery - Short 119
June 08, 2021 11:00 - 6 minutes - 9.43 MBIn 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 refr...
Small System Vacuum Tip - Short 118
June 01, 2021 11:00 - 5 minutes - 7.14 MBIn this short podcast episode, Bryan goes over one of his most valuable tips for pulling a vacuum on a small system. It can be very difficult to pull a vacuum on a small system, especially when you're dealing with a low-temperature application like a freezer. When you pull a vacuum, you're creating a low-pressure area that affects molecule behavior. So, you're creating a situation where the molecules push their way out of the system and into your vacuum pump. The low temperature and small ...
How to END Callbacks
May 20, 2021 11:00 - 50 minutes - 68.9 MBIn this podcast episode, Bryan and Eric Mele explain how HVACR technicians can END callbacks with a few best practices. Rushing through calls will often lead to callbacks. One of the most common mistakes techs make is failing to check the condensate drain before walking away from a job. To end callbacks, technicians would be wise to check the entire system and note any possible problem areas; in commercial HVAC and refrigeration, pay attention to variation across evaporators, condensers, a...
Compressor Overheating Diagnosis & Prevention
May 13, 2021 11:00 - 31 minutes - 44 MBIn this podcast episode, Bryan and Eric Mele discuss the diagnosis and prevention of compressor overheating in HVAC and refrigeration. The main causes of compressor overheating are inadequate cooling back to the compressor, low charge, restrictions, and sometimes even poor suction line insulation. We want to keep the suction temperature low while maintaining appropriate superheat. If the suction line temperature is too high, the compressor can't cool down well enough. Dirty condenser coils...
Re-tapping Transformers - Short 117
May 11, 2021 11:00 - 8 minutes - 12.4 MBIn this short podcast episode, Bryan and Eric Mele talk about re-tapping transformers for single-phase equipment in 208v applications. Most single-phase equipment can work for 230v or 208v, meaning that they can operate with low voltage. However, we typically see 208v in commercial buildings. The sine waves of 208v equipment are 120 degrees out of phase, not 180 degrees (as in split-phase applications). We get lower voltage from leg to leg (208v, though the voltage can be a little higher o...