エピソード

  • NATE HVAC Exam Prep 16, Relays Contactors Sequencers and Safeties

    NATE HVAC Exam Prep 16, Relays Contactors Sequencers and Safeties
    2026/09/03
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Distinction between relays, contactors, and sequencers in HVAC control applications - How normally open and normally closed contacts behave in schematic diagrams - Staging electric heating elements and fan operation using timing sequencers - Function and series wiring of high limits, pressure switches, and safety interlocks - Step-by-step method to trace low voltage control inputs to line voltage load responses For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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    4 分
  • NATE HVAC Exam Prep 15, Transformers and Low Voltage Control Power

    NATE HVAC Exam Prep 15, Transformers and Low Voltage Control Power
    2026/09/02
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to calculate maximum secondary amperage using transformer VA ratings and turns ratio formulas - The impact of incorrect primary multi-tap wiring on low-voltage output and contactor reliability - Requirements for secondary grounding and Class 2 overcurrent protection under NEC Article 725 - How to accurately interpret meter readings across open fuses and identify common exam trap choices - A safe step-by-step troubleshooting sequence to isolate low-voltage shorts without bypassing protection For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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    4 分
  • NATE HVAC Exam Prep 14, Motors Capacitors and Starting Circuits

    NATE HVAC Exam Prep 14, Motors Capacitors and Starting Circuits
    2026/09/01
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Key operational differences between shaded-pole, PSC, and ECM motors tested on the NATE exam. - How to calculate resistance across common, run, and start terminals to identify compressor connections. - Operating principles of potential relays versus current relays, including back-EMF pickup and contact states. - Critical rules for capacitor replacement, microfarad sizing, voltage ratings, and dual-capacitor terminal wiring. - Safe capacitor discharge procedures using bleeder resistors and motor shaft rotation orientation standard. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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    5 分
  • NATE HVAC Exam Prep 13, Alternating Current Inductance and Power Factor

    NATE HVAC Exam Prep 13, Alternating Current Inductance and Power Factor
    2026/08/31
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How frequency and inductance create counter electromotive force and inductive reactance in HVAC motor windings. - How to apply the ELI the ICE man mnemonic to remember voltage and current phase relationships in inductive and capacitive circuits. - The distinction between pure resistance, inductive reactance, and total circuit impedance measured in ohms. - How to differentiate between real power in watts and apparent power in volt-amps on NATE exam calculations. - The concept of power factor and how run capacitors reduce reactive current to improve motor operating efficiency. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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    5 分
  • NATE HVAC Exam Prep 12, Series and Parallel HVAC Circuits

    NATE HVAC Exam Prep 12, Series and Parallel HVAC Circuits
    2026/08/30
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Voltage drop rules for closed versus open switches in series control circuits - How current and voltage behave across parallel loads versus series safety devices - Resistance calculations for series and parallel HVAC electrical paths - Troubleshooting symptoms of open circuits, short circuits, and high-resistance connections - The operation and electrical behavior of electric heat elements connected in parallel For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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    4 分
  • NATE HVAC Exam Prep 11, Voltage Current Resistance and Power

    NATE HVAC Exam Prep 11, Voltage Current Resistance and Power
    2026/08/29
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to apply Ohm's Law and Watt's Law to calculate voltage, current, resistance, and power in HVAC circuits. - Why a ten percent drop in voltage results in a nineteen percent loss in resistive heating power output. - How to interpret voltage drop readings across closed contactor contacts to identify high-resistance faults. - Essential safety and technical procedures for measuring resistance and continuity without damaging digital multimeters. - How to apply the memorable mnemonic Volts Push, Amps Flow, Ohms Slow, Watts Grow to master electrical troubleshooting on test day. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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    4 分
  • NATE HVAC Exam Prep 10, HVAC Fundamentals Calculations and Exam Traps

    NATE HVAC Exam Prep 10, HVAC Fundamentals Calculations and Exam Traps
    2026/08/28
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to correctly convert temperature between Fahrenheit, Celsius, and absolute Rankine scales on NATE questions. - The vital difference between PSIG and PSIA and when to add 14.7 for gas law equations. - How to calculate airflow CFM from electric heat kilowatts using sensible heat formulas. - A units-first calculation strategy using the mnemonic Units Direct The Route to avoid order-of-operation mistakes. - Why manufacturer instructions take priority over generic rules of thumb on code and fundamentals questions. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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    4 分
  • NATE HVAC Exam Prep 9, Combustion Venting and Carbon Monoxide Safety

    NATE HVAC Exam Prep 9, Combustion Venting and Carbon Monoxide Safety
    2026/08/27
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Key differences between complete and incomplete combustion and primary versus secondary air requirements. - Unconfined space volume rules per NFPA 54 requiring 50 cubic feet per 1,000 BTU per hour total input. - Flame diagnostics for identifying yellow tipping, floating flames, and cracked heat exchanger indicators. - Venting system classifications for Category I and Category IV systems along with draft spillage testing procedures. - Emergency safety action protocols when flue gas CO exceeds 400 ppm air-free or active spillage occurs. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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    4 分