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HVAC School - For Techs, By Techs

HVAC School - For Techs, By Techs

Auteur(s): Bryan Orr
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À propos de cet audio

 HVAC School is the ever growing online source for real training topics for technicians in the Air-conditioning, Heating and Ventilation Fields. In the podcast, we will share recorded training, tech ride alongs, share challenging diagnostic scenarios. All to help make the industry, your company, and your truck a better place to be. Développement personnel Gestion et leadership Réussite Économie
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  • Balance Point Explained w/ Jim Fultz

    Balance Point Explained w/ Jim Fultz
    Oct 2 2025
    This comprehensive episode dives deep into one of the most critical yet misunderstood concepts in HVAC: balance point calculations for heat pump systems. Jim and Bryan break down the complexities of dual fuel systems, explaining why proper sizing and balance point calculations are essential for both comfort and efficiency. The discussion moves beyond basic definitions to provide practical guidance that contractors can immediately apply in the field. The conversation begins with fundamental principles, emphasizing that heat pumps must be sized for cooling loads rather than heating loads to avoid moisture problems and ensure optimal performance. The hosts clarify the crucial distinction between dual fuel systems (where it's either the heat pump or backup fuel source) versus supplemental heat systems (where both can run simultaneously). This difference drives entirely different installation approaches and system configurations. A significant portion of the episode focuses on the two types of balance points that contractors encounter: capacity balance point and economic balance point. The capacity balance point represents the outdoor temperature at which the heat pump can no longer meet the heating demand, and backup heat must engage. The economic balance point, while more complex to calculate, determines when it becomes more cost-effective to run backup heat instead of the heat pump based on fuel costs and equipment efficiency. The technical discussion includes practical applications using modern thermostats like the Sensei Touch 2, which offers programmable balance point settings and lockout features. Jim introduces Copeland's new Equipment Interface Module (EIM), which simplifies heat pump retrofits by utilizing existing two-wire systems while maintaining full functionality, including balance point control and A2L refrigerant safety compliance. Key Topics Covered Load Calculations and System Sizing - Why heat pumps must be sized for cooling loads, not heating loads, and the critical role of Manual J calculations in dual fuel applicationsDual Fuel vs. Supplemental Heat Systems - Technical differences between systems where backup heat replaces the heat pump versus systems where both operate simultaneouslyCapacity Balance Point Calculation - Step-by-step methodology for determining when backup heat engagement is necessary based on equipment capacity versus heating loadEconomic Balance Point Analysis - Complex calculations involving fuel costs, equipment efficiency ratings, and coefficient of performance (COP) to optimize operational costsInstallation Constraints and Safety - Why coils cannot be installed upstream of gas furnaces, head pressure concerns, and proper placement of electric heat stripsThermostat Programming and Controls - Advanced features in modern thermostats including outdoor temperature sensors, lockout settings, and automated balance point managementEquipment Interface Module (EIM) - New technology for simplifying heat pump retrofits using existing wiring while maintaining safety compliance for A2L refrigerantsCoefficient of Performance (COP) - Understanding efficiency metrics and why heat pumps typically outperform electric resistance heat until extremely low temperaturesPractical Field Applications - Real-world scenarios, common mistakes, and troubleshooting approaches for balance point issuesCopeland Resources - Mobile apps and tools, including Copeland Scout for compressor replacement and WR Mobile for controls and thermostats Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool. Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at https://hvacrschool.com/symposium. Subscribe to our podcast on your iPhone or Android. Subscribe to our YouTube channel. Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android
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    49 min
  • Dehumidify with a Waterfall? - Short #259

    Dehumidify with a Waterfall? - Short #259
    Sep 30 2025

    In this short podcast episode, Bryan talks about history and HVAC science: how to dehumidify the air with a waterfall and how cold water became the first air conditioner.

    In 1902, Willis Carrier worked for a printing company in Brooklyn, New York. There was a huge humidity problem during the summer: the printing plant got damp, causing paper to swell and ink to smudge. Carrier realized that he could wring water out of the air if he brought the air's temperature below the dew point. His solution was to spray chilled water into the airstream; he filed a patent for an invention that would pass air through a mist of cool water, which caused it to cool down and shed its moisture. He called it the "apparatus for treating air."

    This invention applies basic psychrometric principles. Air holds water vapor up to a certain point. The dew point defines that point. If the air is full of water vapor and its temperature drops below that dew point, excess water vapor condenses to liquid water (such as when it passes over an evaporator coil). In the case of Carrier's invention, the cold water in the spray chamber acted as a giant cooling coil. However, if the water is warm, the opposite effect would happen.

    We do NOT dehumidify with liquid water due to the requirement for water treatment (to prevent algae and scale buildup). Cold water is less prone to bacterial and algal growth than warm water, but it's still essentially an indoor science experiment. Water is also messy and causes corrosion, and pumping it is expensive. Carrier's experiment evolved to the chilled water coil, which then evolved to the DX coils we see today.

    Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool.

    Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at https://hvacrschool.com/symposium.

    Subscribe to our podcast on your iPhone or Android.

    Subscribe to our YouTube channel.

    Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android
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    8 min
  • What are User Requirements? w/ ELK

    What are User Requirements? w/ ELK
    Sep 25 2025
    In this comprehensive session, Eric Kaiser walks through the critical importance of establishing proper user requirements before making equipment purchases. Drawing from real-world experiences in the HVAC industry, he demonstrates how poor upfront planning leads to costly mistakes, buyer's remorse, and multiple equipment purchases. The discussion covers everything from selecting simple tools like screwdrivers to complex HVAC system installations for residential and commercial applications. Eric begins with relatable examples that everyone can understand - like buying screwdrivers that don't do the job you need them for, leading to accumulating multiple tools over time. He then escalates to more serious scenarios, sharing a story about a company that spent significant money switching business software twice because they failed to identify a crucial missing feature upfront. This pattern of inadequate planning costs businesses and homeowners thousands of dollars and countless hours of frustration. The heart of the presentation focuses on a structured approach to equipment selection that prioritizes needs over wants. Eric introduces a step-by-step process that includes defining intended use, conducting thorough assessments, categorizing requirements as needs versus wants, and performing systematic candidate evaluation. He demonstrates this methodology using electrical meter selection, showing how 38 potential options can be narrowed down to just two viable candidates through careful analysis of features like amperage capability, True RMS measurement, and accuracy requirements. The session expands into HVAC system selection, where the stakes are much higher. Participants share valuable insights about customer expectations, from wanting to know when quiet systems are running (leading to flag solutions on registers) to dealing with customers who expect their new heat pump to feel as warm as their old poorly-designed system. Eric emphasizes that understanding customer expectations often differs from understanding their stated wants, requiring skilled questioning to uncover the real requirements for comfort, noise levels, and operational preferences. Key Topics Covered The Cost of Poor Planning: Real examples of expensive mistakes from inadequate user requirements, including business software failures and HVAC mismatchesStructured Selection Process: Step-by-step methodology for equipment selection from initial use definition through final verification and purchaseNeeds vs. Wants Prioritization: Framework for distinguishing between essential requirements and desirable features to avoid decision paralysisElectrical Meter Selection: Detailed walkthrough showing how to narrow 38 options to 2 viable candidates using systematic evaluation criteriaHVAC System Selection Complexities: Load calculations, customer expectation management, and the importance of understanding actual usage patternsCustomer Psychology and Expectations: Understanding why customers may want noise from systems, visual confirmation of operation, and familiar operational feelCommercial Equipment Considerations: Rooftop unit replacement challenges, curb adapters, crane access, and the complexity of retrofit installationsInstallation and Commissioning: The critical role of proper system setup, customer training, and setting realistic expectations for new equipment operationRisk Assessment in Selection: How complexity and potential failure costs should determine the formality and thoroughness of your selection processData Collection for Future Decisions: The value of documenting system performance during routine maintenance to inform future replacement decisionsHidden Costs and Considerations: Factors like electrical requirements, ductwork compatibility, equipment accessibility, and service support that impact long-term ownership costs Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool. Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at https://hvacrschool.com/symposium. Subscribe to our podcast on your iPhone or Android. Subscribe to our YouTube channel. Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android
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    1 h et 19 min
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excellent in every way, down to earth, straight forward decent people trying to make their part of the world better by sharing their knowledge and experiences.

excellent

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