HVAC School - For Techs, By Techs

Chris Forth, the VP of regulatory codes and environmental affairs at Johnson Controls, joins Bryan for a live podcast at AHR 2022. This time, they discuss changing HVAC regulations and what that will mean for contractors, technicians, and installers. Johnson Controls focuses on institutional chillers, controls with digital platforms, air handlers, filtration, and alarm systems. Lately, Chris has gotten the industry ready to convert existing products and systems to high-efficiency equipment for low-GWP, A2L refrigerants. The transition to A2L refrigerants will be different from the transition from R-22 to R-410A. We needed to change the oil type (mineral oil to POE) and make equipment for different pressures when we went from R-22 to R-410A. However, the pressure and oil needs of A2L refrigerants are very similar to R-410A; the main obstacle is dealing with mild flammability. Every six years, the U.S. Department of Energy (DOE) sets minimum efficiency standards, and they determined that it's time for an upgrade. In other words, 14-SEER straight-cool A/C systems will no longer cut it in some places. In the Southeast, equipment that doesn't meet the new standards must be INSTALLED before 2023. (In other cases, the date of manufacturing is what matters.) Now, contractors need to be sure that they can install 14-SEER units before 2023 if they order them. Otherwise, contractors may be better off ordering 15-SEER units now to ensure that they can install the equipment. Chris and Bryan also discuss: North vs. south efficiency ratings AHRI match How manufacturers will be affected by these regulations American Innovation and Manufacturing Act (AIM Act) The self-extinguishing properties of A2L refrigerants Learn more about Johnson Controls at https://www.johnsoncontrols.com/. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Kevin Hart, the CEO of HAVEN, joins Kaleb Saleeby live from AHR 2022 to discuss how we can control IAQ with central air monitors and controllers. HAVEN, formerly TZOA, is an IAQ company that focuses on protecting building occupants' health by controlling air quality. HAVEN's approach to managing IAQ starts with collecting data about the air. Without that data, we can't come up with solutions tailored to individual buildings. We need sensors to gather that data, which would traditionally mean that we'd need a decentralized system with sensors everywhere. However, HAVEN takes a centralized approach to measuring and controlling indoor air quality. HAVEN's central air monitoring system is not an ordinary box product. Monitors constantly provide data that help HVAC professionals find points of improvement in a home and form a solid professional relationship with homeowners. The goal is to use data as a bridge to connect the homeowner and contractor as well as build trust. One of HAVEN's new projects is to expand into remote HVAC diagnostics. The search for deviations in heating, cooling, and comfort will allow HAVEN to get more involved in the HVAC industry and communicate diagnostic help and solutions more effectively. Kevin and Kaleb also discuss: HAVEN's name and vision Avoiding false positives for harmful substances with centralized monitoring Equipment longevity Stagnancy of air in homes in moderate climates The issue with constant 50% relative humidity Outdoor air quality and comparative analysis IAQ as a luxury rather than a necessity Predictions for the HVAC industry Learn more at https://haveniaq.com/ or become a HAVEN Pro today at https://pro.haveniaq.com/. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Jacques Beaudry-Losique, the CEO of Enginuity Power Systems, joins Nathan Orr live at AHR 2022. Enginuity manufactures energy-efficient engines that produce more power than traditional engines and recover waste heat to act as water heaters. Enginuity engines can run on propane and natural gas to help you run almost entirely off the grid and participate in electricity buyback programs. These units operate independently of the electrical grid and can act as generators during power outages and have a small footprint. However, a backup battery system is recommended for these units to maximize efficiency. Enginuity has a residential and commercial line. The E | ONE is best suited for residential applications, and the E | TWO is better for heavier commercial applications. The U.S. Army has been one of the most prominent supporters of Enginuity, which also manufactures its units exclusively in America. Distribution is done through a third party, including business owners and technicians; Enginuity doesn't deal directly with homeowners or building staff. As a result, A/C service technicians, installers, plumbers, and refrigeration technicians may end up being the people in the middle who do maintenance on Enginuity generators. After this conversation with Jacques, we are very interested in seeing what the future holds for Enginuity and combined appliances. Jacques and Nathan also discuss: The electrical grid's stability Enginuity's revolutionary piston design Ease of startup and commissioning Pricing questions Enginuity's target market and training resources for that target market Engine life expectancy Enginuity's projected rollout timeline and expansion plans Decentralizing power dependence Solar vs. fossil fuel energy The problem with power plants Learn more about Enginuity at https://enginuitypowersystems.com/. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Rick Nadeau, Director of Training and Technical Services at Samsung, talks with Kaleb Saleeby live from AHR. He explains some of the exciting ductless solutions that Samsung has to offer. Samsung's WindFree mini-split systems work with VRF systems or as normal ductless units. The WindFree product line is best known for preventing drafts due to microholes. These systems come in one-way and four-way cassettes and work very well for sensitive environments like nursing homes and bedrooms. These units also have humidity sensors that let the units know when it would and wouldn't be acceptable to go into WindFree mode. Samsung's systems may also have occupancy sensors, which determine when they can turn on to provide comfort and flexibility. The systems also have the capability to determine when the system is losing refrigerant to prevent major environmental and performance issues. Samsung has MaxHeat technology, which allows a system to have 100% heating capacity in low-ambient temperatures as low as -30 degrees Fahrenheit. So, the lack of reliance on auxiliary heat can reduce energy consumption and costs under most conditions. In general, much of Samsung's innovative technology is introduced across entire product lines. In the commercial sphere, Samsung's DVM S is an influential modular chiller and water heating system. Its flexible design (thanks to VRF technology) has made it a popular choice for product storage in vineyards. The DVM S Eco also has heat recovery capabilities. Rick and Kaleb also discuss: Stratification prevention and high-ceiling configurations Air velocity and unit cleanliness Refrigerant loss detection Learn more about Samsung's ductless systems and online training programs at https://www.samsunghvac.com/. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Steve Rogers from The Energy Conservatory (TEC) joins Eric Kaiser to talk about airflow measurement at AHR 2022. Steve is an expert in fluid dynamics and flow measurement, and he is a trainer in addition to being the president and CEO of TEC. Airflow is one of the most critical elements of an HVAC system; it allows us to move the correct amount of BTUs to condition the air properly. We have various ways of measuring system airflow and airflow to a space. We can use the TrueFlow grid for the former and flow hoods for the latter. When it comes to measuring airflow, calibrating the instrumentation is crucial. TEC uses a laboratory-grade orifice plate to calibrate the tools. So, the calibration process manages to yield high accuracy while using a low-maintenance device. To begin measuring airflow properly, start taking the total external static pressure (TESP) and looking at fan charts. TESP doesn't actually measure airflow, but it provides an idea of what the airflow might be like, and it's a practical, useful measurement in the field. The TEC TrueFlow grid has recently been upgraded, and it's a good step up from taking the TESP and referencing fan charts. It goes into the filter slot and measures the CFM per ton as well as the static pressure. Steve and Eric also discuss: Airflow's effect on latent and sensible cooling Blower door setups and chambers References for accuracy Relationship between static pressure and airflow Is the hand-ometer an acceptable form of airflow measurement? Challenges of pitot tubes and hot-wire anemometers Learn more about The Energy Conservatory at https://energyconservatory.com/. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Brett Wetzel and Kevin Compass from the Advanced Refrigeration Podcast join us to discuss commercial rack refrigeration and identify components. In supermarket racks, we typically have anywhere from 2-5 compressors on a single rack (with multiple evaporators, metering devices, and sometimes even condensers). These compressors may come in several varieties (including screw and scroll) and be digital or have VFDs. They also have common suction and discharge headers. The compressors all share oil from a single system. Oil separators can come in three varieties: centrifugal, impingement, and coalescing (most efficient). The separator would feed into the reservoir, which stores oil. Many rack systems use several different valves. Check valves to direct the refrigerant flow, especially on heat reclaim systems and split condensers. In some cases, there is a three-way valve or a solenoid valve that controls or stops the refrigerant flow. LDR (liquid differential regulating) valves maintain the required differentials during defrost. Ball valves can be found all over a rack (liquid line, suction line, discharge line, etc.) and can isolate a line. Standard and balanced-port TXVs or EEVs may also appear on racks. There is also an EPR, which controls evaporator temperature and pressure. Grocery systems have a drop leg before the receiver, which stores liquid refrigerant. We want a full column of liquid leaving the receiver, which we can confirm with a sight glass rather than subcooling. Brett, Kevin, and Bryan also discuss: Reheat and excess heat Split condensers Drain leg/drop leg vs. liquid line Mechanical subcooling and heat exchangers Counterflow piping Hot gas vs. Kool gas defrost Standard vs. balanced-port TXVs Distributors Evaporator fin spacing Cleaning components Check out the Advanced Refrigeration Podcast on any podcast app of your choosing. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Jim Fultz from Emerson joins Eric Kaiser at AHR to share his knowledge of universal boards and controls. Jim's work focuses on electronic controls within the White-Rodgers brand. Common White-Rodgers universal controls include the SureSwitch and universal defrost controls. The SureSwitch also has sealed contacts, which prevents insects and debris from shorting out the contacts. This past year, White-Rodgers debuted the All-Spark, which doesn't need electricity to be powered up and can be programmed right out of the box. The All-Spark works on all sorts of appliances, not just boilers and furnaces. Universal controls are generally safe to put in combustion units, even gas furnaces. New controls go through rigorous testing before they hit the market. The controls MUST stay within the OEM's guidelines; otherwise, they won't make it to the market. Sometimes, when boards need to be replaced, we also need to upgrade the igniter to match the voltage of the new board. The goal of universal controls is to save time and hassle for the technicians and the customers, which makes it easier to make sales. It's also easier for the distributor to get fast and accurate solutions to the technicians, especially when OEM parts may not be immediately available due to supply chain issues and normal shipping expectations. Jim and Eric also discuss: All-Spark benefits and features Manufacturer-specific vs. general universal controls White-Rodgers nomenclature Controls instructions Distributors and sales reps Evolution of controls for direct-spark and hot-surface ignition Training techs to install controls on equipment Learn more about White-Rodgers controls at https://climate.emerson.com/en-us/brands/white-rodgers. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

In this short podcast from AHR 2022, Leilani Orr and Eric Kaiser talk with the president and CEO of Malco Tools, Rich Benninghoff. Rich discusses some of the exciting new tools that Malco is bringing to the market and some plans for the future, especially when it comes to education. Malco has developed the Eagle-Grip, which is a set of locking-handle pliers made in the USA with American steel. The tool is currently in a soft launch; it is currently receiving a lot of interest, so Malco has been building up inventory, forming partnerships across industries, and collecting market feedback. One of Malco's most exciting products is the C-RHEX line of cleanable, reversible magnetic hex drivers. These hex drivers come in many sizes and are easy to clean; the cleanable and magnetic features are especially important, as the buildup of metal resin and clippings can decrease tool longevity and effectiveness without proper cleaning. Malco has also been focusing on trade schools and education through "Look Good, Feel Good, Do Good." The initiative gives back to the community and provides career and education-enhancing opportunities to young people who are serious about the trade. Over the next decade, expect to see Malco continue investing in product innovation. Rich is excited to grow the brand and help the HVAC, automotive, and other industries along the way. Rich also covers: Malco's history with sheet metal fabrication Relying on customers for feedback and ideas "Head of the Class" program Providing tools for shop classes in local school districts Learn more about Malco Tools at https://www.malcoproducts.com/. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Jason Obrzut joins Nathan Orr with the HVAC School podcast live from AHR. In this episode, they discuss A2L refrigerants and upcoming regulations. They explain what a "flammable" refrigerant really is and why the industry may be making a bigger deal of the new regulations than is really necessary. Whenever regulations are passed, we need to understand that there is a notable transition period. This period will mostly be about training, and the only people who should be working on the new equipment should be the most experienced technicians. A2L refrigerants are mildly flammable, non-toxic refrigerants, including R-32. Flame propagation is possible but quite rare for A2L refrigerants under normal operating conditions. However, even A1 refrigerants can propagate flame under the right conditions (just not ones we'd normally see). Many countries all over the world have been using A2L refrigerants for much longer than we have, so we can make those refrigerants work safely. All trades will evolve, and we need to be prepared and trained to adapt to changes over time. When we learn all the new practices that come with these new regulations, we become better technicians. The only place where we can make a difference is in our work, so it pays to focus on learning new things instead of resisting change. Jason and Nathan also discuss: A2L vs. A1 vs. A2 vs. A3 refrigerants What does "flammable" really mean? Recordkeeping regulations for A2L refrigerants Getting over the fear of the unknown Why the HFC phasedown is NOT driven by refrigerant manufacturer profits Learn more about ESCO's HVAC Excellence conference HERE. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

David Holt with NCI returns to the podcast to discuss the evolution of HVAC training; we cover the past, present, and the possible future of training in the industry. In the past, we had a lot of hands-on training, whether it was one-on-one or in a traditional classroom setting. These learning practices remain beneficial today, especially since many uninformed practices are still prevalent in the industry today (charging to beer-can cold, condemning TXVs without a second thought, etc.). However, the pandemic has forced us to consider online and remote training in the present. The content has also changed from the past; we are a lot more aware of combustion and airflow nowadays, which are very important topics for safety and efficiency. Those training topics allow us to understand what we're doing when we take the "vital signs" of the equipment. Being better versed in basic and advanced diagnostics will also give us a more holistic understanding of the HVAC equipment as a system, which can help us truly optimize the systems instead of changing parts and making band-aid fixes. Moving forward, we can expect HVAC training to use virtual reality to help bring traditional hands-on training to the online sphere. We can't expect a perfect replacement, but we can expect improvements in technology to close the learning gaps that result from online training. David and Bryan also discuss: NCI training during the pandemic Components vs. systems ASHRAE Standard 221-2020 Older educational resources and standards Occupational safety Pricing Online classes, podcasts, and other modern training media Learn more about the National Comfort Institute (NCI)'s training and sign up HERE. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE. Check out information on the 2022 HVACR Training Symposium at https://hvacrschool.com/symposium/.