Advanced Refrigeration Podcast

Danfoss Mini Pack Controller Overview PC572, Its Friday back from Jersey Episode 519 Mini Pack Controller Deep Dive (PC572 + AK-PT50): CO₂ Condensing Unit Controls, Gateways, and HeadachesBrett and Kevin open the Advanced Refrigeration Podcast with Kevin driving across multiple states after an unexpectedly expensive hotel stay near Springfield, Illinois. Brett gives a brief, hands-on overview of a Danfoss Mini Pack controller (PC572) used on newer single CO₂ condensing units, explaining that programming requires the AK-PT50 Windows software plus a Danfoss gateway and a data-capable micro USB cable. He walks through connecting, uploading, and navigating key menus for plant type, suction groups, compressor/VFD settings (including start speed logic), gas cooler and receiver pressure controls, oil control options, alarms, I/O configuration, and expansion modules needed for missing sensors/outputs. They note unit settings are largely in Celsius/Kelvin, warn not to program Danfoss VFDs with a laptop plugged into wall power, and conclude that these compact condensing units are cramped and would benefit from phone-accessible tools.

Danfoss Mini Pack Controller Overveiw PC572, Its Friday back from Jersey Episode 519 Mini Pack Controller Deep Dive (PC572 + AK-PT50): CO₂ Condensing Unit Controls, Gateways, and HeadachesBrett and Kevin open the Advanced Refrigeration Podcast with Kevin driving across multiple states after an unexpectedly expensive hotel stay near Springfield, Illinois. Brett gives a brief, hands-on overview of a Danfoss Mini Pack controller (PC572) used on newer single CO₂ condensing units, explaining that programming requires the AK-PT50 Windows software plus a Danfoss gateway and a data-capable micro USB cable. He walks through connecting, uploading, and navigating key menus for plant type, suction groups, compressor/VFD settings (including start speed logic), gas cooler and receiver pressure controls, oil control options, alarms, I/O configuration, and expansion modules needed for missing sensors/outputs. They note unit settings are largely in Celsius/Kelvin, warn not to program Danfoss VFDs with a laptop plugged into wall power, and conclude that these compact condensing units are cramped and would benefit from phone-accessible tools.

Big Blue Bubbles, Nylog Truths & CO₂ Oil Mysteries (w/ John Pastorello) | Advanced Refrigeration PodcastBrett Wetzel and Kevin Kompus open with shop-talk about chaotic workloads, out-of-town jobs colliding with local work, a thrown-out back from flipping coffin cases, and joking about “not looking” at oil sample results. They welcome guest John Pastorello, founder of Refrigeration Technologies, who shares his path from bench chemist to HVAC/refrigeration tech to contractor, then into product formulation after back issues. John explains how he developed Big Blue as a refrigerant-compatible bubble leak detector and why spray application helps identify leaks, then discusses Nylog’s origins, red (mineral oil) vs blue (POE) versions, and cautions against using Nylog alone on high-pressure CO₂ systems. They review a CO₂ oil analysis, sampling locations, possible contaminants, and why some bubble sprays can trigger electronic leak detectors due to chlorinated preservatives, and John also critiques harsh coil-cleaner chemistry and private-equity buyouts.

Big Blue Bubbles, Nylog Truths & CO₂ Oil Mysteries (w/ John Pastorello) | Advanced Refrigeration PodcastBrett Wetzel and Kevin Kompus open with shop-talk about chaotic workloads, out-of-town jobs colliding with local work, a thrown-out back from flipping coffin cases, and joking about “not looking” at oil sample results. They welcome guest John Pastorello, founder of Refrigeration Technologies, who shares his path from bench chemist to HVAC/refrigeration tech to contractor, then into product formulation after back issues. John explains how he developed Big Blue as a refrigerant-compatible bubble leak detector and why spray application helps identify leaks, then discusses Nylog’s origins, red (mineral oil) vs blue (POE) versions, and cautions against using Nylog alone on high-pressure CO₂ systems. They review a CO₂ oil analysis, sampling locations, possible contaminants, and why some bubble sprays can trigger electronic leak detectors due to chlorinated preservatives, and John also critiques harsh coil-cleaner chemistry and private-equity buyouts.

CO2 Nope, Kool Gas Defrost Operation I'm Finally Home Episode 517Cool Gas Defrost Chaos: Deer Hits, Smashed Windows, and Hussman Rack TroubleshootingBrett Wetzel and Kevin Compass kick off the Advanced Refrigeration Podcast by begging for listener topic requests and recapping a week of pure mayhem, including Brett’s 27-hour drive home from Pennsylvania after hitting a deer and nearly blowing a tire, plus Kevin’s disaster-filled week running multiple remodel startups while a customer changed EMS controller passwords mid-day and thieves smashed van windows in a Chicago parking lot. They pivot into a hot-weather technical deep dive on Hussman cool gas defrost, contrasting it with hot gas defrost and explaining cool gas as a latent-heat process that depends on proper termination. They cover how LDR/OLDR differential control can spiral during vapor-in/vapor-out conditions, how receiver level and outlet piping height can ruin defrost by pulling liquid, why head pressure isn’t the fix, and how to troubleshoot via graphing and defrost schedules. They also stress correct defrost termination temps in winter, proper fan shutoff strategy (preferably via EMS or suction-line controls), and common Hussman retrofit pitfalls like miswired bi-flow CME solenoids, wrong internal rebuild parts, and when to gut or remove unnecessary solenoids and branch boards to reduce leaks and headaches.

CO2 Nope, Kool Gas Defrost Operation I'm Finally Home Episode 517Cool Gas Defrost Chaos: Deer Hits, Smashed Windows, and Hussman Rack TroubleshootingBrett Wetzel and Kevin Compass kick off the Advanced Refrigeration Podcast by begging for listener topic requests and recapping a week of pure mayhem, including Brett’s 27-hour drive home from Pennsylvania after hitting a deer and nearly blowing a tire, plus Kevin’s disaster-filled week running multiple remodel startups while a customer changed EMS controller passwords mid-day and thieves smashed van windows in a Chicago parking lot. They pivot into a hot-weather technical deep dive on Hussman cool gas defrost, contrasting it with hot gas defrost and explaining cool gas as a latent-heat process that depends on proper termination. They cover how LDR/OLDR differential control can spiral during vapor-in/vapor-out conditions, how receiver level and outlet piping height can ruin defrost by pulling liquid, why head pressure isn’t the fix, and how to troubleshoot via graphing and defrost schedules. They also stress correct defrost termination temps in winter, proper fan shutoff strategy (preferably via EMS or suction-line controls), and common Hussman retrofit pitfalls like miswired bi-flow CME solenoids, wrong internal rebuild parts, and when to gut or remove unnecessary solenoids and branch boards to reduce leaks and headaches.

HCR Air Door Trials & Tribulations: Getting the Air Curtain Right (Without Losing Your Mind)In this episode of the Advanced Refrigeration Podcast, Brett and Kevin swap war stories from a week of startups and an “air door extravaganza,” breaking down how to properly set up HCR air doors in open walk-in produce and dairy boxes before summer humidity wrecks everything. They explain why dirty or plugged coils, incorrect VFD frequency, misadjusted discharge louvers, missing intake screens, and uncapped or improperly trapped drains can kill airflow, spike humidity, and lead to frosting, sweating pans, and nonstop load issues. They share practical setup targets using a vane anemometer, flagging tape (or even low-ply toilet paper), and basic hand tools, plus why building envelope and store humidity control matter as much as the door itself. They also discuss night doors, coil staging, PID response, and how “lab specs” don’t survive 50,000 shoppers.

HCR Air Door Trials & Tribulations: Getting the Air Curtain Right (Without Losing Your Mind)In this episode of the Advanced Refrigeration Podcast, Brett and Kevin swap war stories from a week of startups and an “air door extravaganza,” breaking down how to properly set up HCR air doors in open walk-in produce and dairy boxes before summer humidity wrecks everything. They explain why dirty or plugged coils, incorrect VFD frequency, misadjusted discharge louvers, missing intake screens, and uncapped or improperly trapped drains can kill airflow, spike humidity, and lead to frosting, sweating pans, and nonstop load issues. They share practical setup targets using a vane anemometer, flagging tape (or even low-ply toilet paper), and basic hand tools, plus why building envelope and store humidity control matter as much as the door itself. They also discuss night doors, coil staging, PID response, and how “lab specs” don’t survive 50,000 shoppers.

Gangrene, Gas Coolers & Back Pain: CO₂ Rack Chaos, Bitzer Secrets, and a Venturi “Ejector” TowerTwo exhausted hosts swap war stories from nonstop construction and CO₂ remodels: one is forced back to Pennsylvania after his father’s death to handle the estate, a rejected body donation due to gangrene, and unexpected cremation costs, while the other throws out his back wrestling a 24-foot coffin case packed with ice and fights sticking three-way drain valves dumping water. With no guest, they riff on training Kroger techs, calibration and control quirks on older Microthermal/Advancer CO₂ stores, and a little-known Bitzer service-valve center plate that directs suction gas toward the head or the windings—impacting cooling, floodback tolerance, and motor protector trips. They also compare BAC performance to others and dig into a Mack gas cooler using a Venturi setup to circulate water without a pump, plus delays, shorted case glass heaters, and general startup chaos.

Gangrene, Gas Coolers & Back Pain: CO₂ Rack Chaos, Bitzer Secrets, and a Venturi “Ejector” TowerTwo exhausted hosts swap war stories from nonstop construction and CO₂ remodels: one is forced back to Pennsylvania after his father’s death to handle the estate, a rejected body donation due to gangrene, and unexpected cremation costs, while the other throws out his back wrestling a 24-foot coffin case packed with ice and fights sticking three-way drain valves dumping water. With no guest, they riff on training Kroger techs, calibration and control quirks on older Microthermal/Advancer CO₂ stores, and a little-known Bitzer service-valve center plate that directs suction gas toward the head or the windings—impacting cooling, floodback tolerance, and motor protector trips. They also compare BAC performance to others and dig into a Mack gas cooler using a Venturi setup to circulate water without a pump, plus delays, shorted case glass heaters, and general startup chaos.

E3 Tile Chaos to Clean Startup Screens: Organizing CO₂ Racks, Layouts, and a Firmware ‘Oops’Brett Wetzel and Kevin Compass kick off this rowdy Advanced Refrigeration Podcast episode with travel talk and a quick rant about getting an E3 to communicate after an IP change, then jump into turning a messy CO₂ rack tile setup into something actually usable. They walk through creating and reorganizing tile groups (receiver, gas cooler, suction groups, oil separator, cases, etc.), explain why breaking menus down makes troubleshooting faster, and show how to build custom layout/startup screens with the key points techs actually need (pressures, temps, valve %, superheat). Along the way they discover icon management, debate the “misc/other” junk-drawer tabs, fumble through the lack of search, and even start a firmware/display update while joking about what might slam shut if it goes sideways. They finish with a quick Modbus address tip and plans for future E3 training videos.

Copeland E3 Tiles, Layout Stuff, Firmware & Atlanta Hood Rat Sh$t Episode-- 514 E3 Tile Chaos to Clean Startup Screens: Organizing CO₂ Racks, Layouts, and a Firmware ‘Oops’Brett Wetzel and Kevin Compass kick off this rowdy Advanced Refrigeration Podcast episode with travel talk and a quick rant about getting an E3 to communicate after an IP change, then jump into turning a messy CO₂ rack tile setup into something actually usable. They walk through creating and reorganizing tile groups (receiver, gas cooler, suction groups, oil separator, cases, etc.), explain why breaking menus down makes troubleshooting faster, and show how to build custom layout/startup screens with the key points techs actually need (pressures, temps, valve %, superheat). Along the way they discover icon management, debate the “misc/other” junk-drawer tabs, fumble through the lack of search, and even start a firmware/display update while joking about what might slam shut if it goes sideways. They finish with a quick Modbus address tip and plans for future E3 training videos.

Sensors and Pressure Transducers: Ranges, Power Requirements, and Troubleshooting TipsThe hosts discuss travel fatigue, long commutes, and airport TSA delays that led to canceling a flight and driving instead, then shift to field work issues during store startups and CO2 conversions, including controller communication problems caused by cabling, IT security port shutdowns from new MAC addresses, and router performance differences. The main technical focus is identifying and troubleshooting pressure transducers and temperature sensors: common signal ranges (1–6V, 0.5–4.5V, 0–5V, 0–10V, and 4–20 mA), matching transducer power requirements (5V, 12V, 24V/24–36V), and selecting correct pressure ranges for applications up to CO2 gas coolers. They cover sensor types (PT1000, 10K2 vs 10K3, 2.2K, 3K, 86.3K), wiring/offset issues with PT1000 over distance, and using linear interpolation apps to convert measured voltage to expected pressure or controller readings. They briefly mention megger use and plan to discuss CO2 leak detection and drain-related concerns next week.

Sensors and Pressure Transducers: Ranges, Power Requirements, and Troubleshooting TipsThe hosts discuss travel fatigue, long commutes, and airport TSA delays that led to canceling a flight and driving instead, then shift to field work issues during store startups and CO2 conversions, including controller communication problems caused by cabling, IT security port shutdowns from new MAC addresses, and router performance differences. The main technical focus is identifying and troubleshooting pressure transducers and temperature sensors: common signal ranges (1–6V, 0.5–4.5V, 0–5V, 0–10V, and 4–20 mA), matching transducer power requirements (5V, 12V, 24V/24–36V), and selecting correct pressure ranges for applications up to CO2 gas coolers. They cover sensor types (PT1000, 10K2 vs 10K3, 2.2K, 3K, 86.3K), wiring/offset issues with PT1000 over distance, and using linear interpolation apps to convert measured voltage to expected pressure or controller readings. They briefly mention megger use and plan to discuss CO2 leak detection and drain-related concerns next week.

CO2 Rack ‘What-If’ Simulations: Gas Cooler Control, Fan/Motor Issues, and Low-Charge BehaviorBrett Wetzel and Kevin Compass open Episode 511 of the Advanced Refrigeration Podcast discussing busy travel, severe weather, and Brett’s final field training day, where they ran CO2 rack “what-if” simulations. They focus on gas cooler TD control via the gas cooler outlet temperature sensor, stressing proper sensor placement and comparing Danfoss limitations to other EMS options (including saturation-based control and fan lockouts). Brett describes attempts to override sensor values on a pack controller, using offsets instead, and demonstrates how warmer gas cooler outlet temperatures (or fan loss) increase flash gas, driving the BGV and medium-temp suction/compressors. They simulate an I-pressure valve stuck open and discuss pitfalls of overriding valves in multiple Danfoss screens. They troubleshoot inverted/programmable EC fan motors, documentation challenges, daisy-chained control wiring issues, and discuss low-charge behavior causing HPV and BGV to close while cases may starve. They also debate liquid piping pickup location (side vs bottom), heat exchanger effects, superheat settings, and hot gas injection setpoints versus Copeland minimum superheat guidance.

CO2 Rack ‘What-If’ Simulations: Gas Cooler Control, Fan/Motor Issues, and Low-Charge BehaviorBrett Wetzel and Kevin Compass open Episode 512 of the Advanced Refrigeration Podcast discussing busy travel, severe weather, and Brett’s final field training day, where they ran CO2 rack “what-if” simulations. They focus on gas cooler TD control via the gas cooler outlet temperature sensor, stressing proper sensor placement and comparing Danfoss limitations to other EMS options (including saturation-based control and fan lockouts). Brett describes attempts to override sensor values on a pack controller, using offsets instead, and demonstrates how warmer gas cooler outlet temperatures (or fan loss) increase flash gas, driving the BGV and medium-temp suction/compressors. They simulate an I-pressure valve stuck open and discuss pitfalls of overriding valves in multiple Danfoss screens. They troubleshoot inverted/programmable EC fan motors, documentation challenges, daisy-chained control wiring issues, and discuss low-charge behavior causing HPV and BGV to close while cases may starve. They also debate liquid piping pickup location (side vs bottom), heat exchanger effects, superheat settings, and hot gas injection setpoints versus Copeland minimum superheat guidance.

The episode opens by thanking sponsors NDL Industries, Parker Sporlan, and Westermeyer Industries, then highlights NDL’s CO₂-rated components including ball and check valves tested up to 2030 PSI with CE/CRN/UL certifications, high-pressure copper fittings rated to 1,885 PSI, and a CO₂ service tee. Parker Sporlan promotes its Virtual Engineer tool for sizing and selecting components for A2L refrigerant projects, and Westermeyer features RDP series differential pressure monitors for oil separator filter condition, including a transcritical CO₂ model. Brett and Kevin discuss actuator torque challenges on CO₂ valves under high differential pressure, ISO 5211 actuator mounting, and the tradeoff between leak-tight sealing and actuator size. They compare CO₂ adoption in the US (~5,000 systems) versus Europe (~95,000), discuss efficiency gains from improved controls, gas cooler sizing impacts, water restrictions affecting adiabatic cooling, ejectors, split gas coolers, and a Walgreens CO₂ rack using extensive heat reclaim, geothermal, and transcritical operation at about 90 bar.

The episode opens by thanking sponsors NDL Industries, Parker Sporlan, and Westermeyer Industries, then highlights NDL’s CO₂-rated components including ball and check valves tested up to 2030 PSI with CE/CRN/UL certifications, high-pressure copper fittings rated to 1,885 PSI, and a CO₂ service tee. Parker Sporlan promotes its Virtual Engineer tool for sizing and selecting components for A2L refrigerant projects, and Westermeyer features RDP series differential pressure monitors for oil separator filter condition, including a transcritical CO₂ model. Brett and Kevin discuss actuator torque challenges on CO₂ valves under high differential pressure, ISO 5211 actuator mounting, and the tradeoff between leak-tight sealing and actuator size. They compare CO₂ adoption in the US (~5,000 systems) versus Europe (~95,000), discuss efficiency gains from improved controls, gas cooler sizing impacts, water restrictions affecting adiabatic cooling, ejectors, split gas coolers, and a Walgreens CO₂ rack using extensive heat reclaim, geothermal, and transcritical operation at about 90 bar.

On this episode of the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass welcome new sponsor NDL Industries with guests Lucas (a Lithuania-based product manager with CO₂ rack design experience) and Amit (VP of Sales in Austin). They discuss the rapid growth of CO₂ refrigeration driven by regulations and efficiency improvements like parallel compression and ejectors, and the need for readily available parts—highlighting NDL’s US distribution hub near Memphis and 130 bar UL-rated fittings. The conversation digs into CO₂ valve and check-valve ratings (UL vs CRN testing), actuator torque challenges, and NDL’s upcoming motorized three-way valve with clearer positioning and positive stops. They also cover service valve/Service-T design to reduce brazed joints, plus real-world transcritical heat reclaim behavior and gas cooler sizing and climate impacts.

On this episode of the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass welcome new sponsor NDL Industries with guests Lucas (a Lithuania-based product manager with CO₂ rack design experience) and Amit (VP of Sales in Austin). They discuss the rapid growth of CO₂ refrigeration driven by regulations and efficiency improvements like parallel compression and ejectors, and the need for readily available parts—highlighting NDL’s US distribution hub near Memphis and 130 bar UL-rated fittings. The conversation digs into CO₂ valve and check-valve ratings (UL vs CRN testing), actuator torque challenges, and NDL’s upcoming motorized three-way valve with clearer positioning and positive stops. They also cover service valve/Service-T design to reduce brazed joints, plus real-world transcritical heat reclaim behavior and gas cooler sizing and climate impacts.

•Brett Wetzel and Kevin Compass open theadvanced Refrigeration podcast with complaints about constant travel and terrible hotels, including broken blinds, bad smells, and cockroaches, plus a rule for avoiding sketchy areas. Kevin recounts a brutal week on a jobsite with an electrical contractor who miswired coils, phases, and controls, causing repeated troubleshooting, power trips, and a major shutdown when rooftop unit drainage spilled into an electrical trough. He then describes training in Chino, California on a Hussmann CO₂ rack with redundant valves, a suspected stuck oil solenoid causing overheated oil lines and high bypass activity, and how correcting it reduced compressor speed. They debate ejectors and parallel compression control, flash tank instability, oil pressure issues, controller limitations, and note miswired electric defrost heaters and CO₂-to-CO₂ heat exchanger failures.

Brett Wetzel and Kevin Compass open the advanced Refrigeration podcast with complaints about constant travel and terrible hotels, including broken blinds, bad smells, and cockroaches, plus a rule for avoiding sketchy areas. Kevin recounts a brutal week on a jobsite with an electrical contractor who miswired coils, phases, and controls, causing repeated troubleshooting, power trips, and a major shutdown when rooftop unit drainage spilled into an electrical trough. He then describes training in Chino, California on a Hussmann CO₂ rack with redundant valves, a suspected stuck oil solenoid causing overheated oil lines and high bypass activity,and how correcting it reduced compressor speed. They debate ejectors and parallel compression control, flash tank instability, oil pressure issues, controller limitations, and note miswired electric defrost heaters and CO₂-to-CO₂ heat exchanger failures.

Brett Wetzel and first-time guest Kevin Compass kick off the Advanced Refrigeration Podcast in a chaotic mood after tech failures, traffic, and a rough week on a large grocery-store refrigeration job where electricians are slowing progress, skipping work on energized circuits, and delaying rack startup. They talk about traveling, hotel safety concerns, sleep deprivation, and returning the following week because verification is only partially complete and the rack couldn’t be started. The conversation shifts into Danfoss case control and pack controller details, including correcting earlier misunderstandings about fan shutdown logic being handled automatically by the pack controller if programmed correctly. Brett walks through Danfoss thermostat control settings (on/off vs modulating), notes recommended minimum modulation percentages (around 3.6–4), and discusses guidance from Brian Rogers about avoiding modulating on dual-temp islands unless using an EPR, especially on CO2 systems due to potential icing issues. They explain S3/S4 sensor weighting (inlet vs discharge air), caution against using weighted control where return air can be blocked (turkey, produce, beer cases), and discuss how modulating control can reduce cycling and improve rack stability—especially on low-temp circuits that affect medium-temp load and BGV stability. They debate CO2 ejector versus high-pressure valve operation, with Brett noting updated information that ejectors run as primary until high utilization before the HPV opens. The episode also covers Danfoss network scheduling for case enable/shutdown staging, group-based defrost schedules, why long stage delays can cause short cycling after power blips, the value of adding minimum loop protections, and the confusion of chained controller calculations. They end by noting a potential wiring/relay issue on ejector solenoids (not all on solid-state relays), joking about communication challenges with a Scottish colleague, and signing off as Brett heads to sleep before an early flight.

Danfoss Case Controllers Enables and Control, Does GoogleTranslate Do Scottish?? Episode-508Brett Wetzel and first-time guest Kevin Compass kick off the Advanced Refrigeration Podcast in a chaotic mood after tech failures, traffic, and a rough week on a large grocery-store refrigeration job where electricians are slowing progress, skipping work on energized circuits, and delaying rack startup. They talk about traveling, hotel safety concerns, sleep deprivation, and returning the following week because verification is only partially complete and the rack couldn’t be started. The conversation shifts into Danfoss case control and pack controller details, including correcting earlier misunderstandings about fan shutdown logic being handled automatically by the pack controller if programmed correctly. Brett walks through Danfoss thermostat control settings (on/off vs modulating), notes recommended minimum modulation percentages (around 3.6–4), and discusses guidance from Brian Rogers about avoiding modulating on dual-temp islands unless using an EPR, especially on CO2 systems due to potential icing issues. They explain S3/S4 sensor weighting (inlet vs discharge air), caution against using weighted control where return air can be blocked (turkey, produce, beer cases), and discuss how modulating control can reduce cycling and improve rack stability—especially on low-temp circuits that affect medium-temp load and BGV stability. They debate CO2 ejector versus high-pressure valve operation, with Brett noting updated information that ejectors run as primary until high utilization before the HPV opens. The episode also covers Danfoss network scheduling for case enable/shutdown staging, group-based defrost schedules, why long stage delays can cause short cycling after power blips, the value of adding minimum loop protections, and the confusion of chained controller calculations. They end by noting a potential wiring/relay issue on ejector solenoids (not all on solid-state relays), joking about communication challenges with a Scottish colleague, and signing off as Brett heads to sleep before an early flight.

Brett Wetzel and recurring guest Kevin Compass kick off with a chaotic hotel minibar mishap where simply picking up items triggers expensive charges, then roll into a wide-ranging, comedic shop talk episode. Kevin describes a slow work week of wire-pulling and quoting jobs and mentions traveling to Texas soon, while Brett recaps two weeks of nonstop travel from Vegas to Newark, Pennsylvania (visiting Remco), and New York for an NASRC event—contrasting “cake” startups with jobs where everything is on fire. They swap stories about racks being mysteriously shut off (including by people in mechanical rooms) and a condo complex protesting rooftop condenser noise until an Aldi blocked a shortcut with a parked semi. The bulk of the episode dives into Danfoss CO₂ rack controls and tuning: comparing Danfoss algorithms to E3, discussing PI settings (KP and TN), neutral band behavior, zone acceleration/deceleration, and how to export/copy controller settings to PDF for before/after records—then using ChatGPT to identify changes. They debate relief setpoints and high-pressure cutouts (including 130 bar/1885 psi references), question why certain pressure limits match, and complain about Danfoss gas cooler fan control relying on temperature instead of pressure, especially in cold weather. Brett explores IO configuration and general-purpose controllers while trying (and failing) to map sensor “S7,” then proposes relay-based fan bank staging as a workaround for EC motors that don’t turndown low enough. They also cover double digital compressor control, advising to set “frequency” scaling to 0–100 (capacity) rather than 0–60, and clarify analog output differences between IDCM modules and Copeland CoreSense (including 1–5V). The conversation shifts to parallel compression and ejector systems: setting up multi-ejector models/blocks, how logic may switch from high-pressure valves to ejectors, and concerns that ejectors/parallel compression can rob already-light medium-temp load. Reviewing piping/prints, they critique oil reservoir piping, note an oil vent differential of 2.4 bar as too low, discuss desuperheater risks in cold ambient conditions, and complain about pre-relief valves and gas cooler bypass as problematic “band-aids.” They wrap with Brett’s early Monday flight to Texas, jokes about being recognized on job sites, and their usual back-and-forth sarcasm and banter throughout.

Danfoss Programming, Watching Brett Fail, AHR Recap, Mini Bar Mayhem-Episode-507Brett Wetzel and recurring guest Kevin Compass kick off with a chaotic hotel minibar mishap where simply picking up items triggers expensive charges, then roll into a wide-ranging, comedic shop talk episode. Kevin describes a slow work week of wire-pulling and quoting jobs and mentions traveling to Texas soon, while Brett recaps two weeks of nonstop travel from Vegas to Newark, Pennsylvania (visiting Remco), and New York for an NASRC event—contrasting “cake” startups with jobs where everything is on fire. They swap stories about racks being mysteriously shut off (including by people in mechanical rooms) and a condo complex protesting rooftop condenser noise until an Aldi blocked a shortcut with a parked semi. The bulk of the episode dives into Danfoss CO₂ rack controls and tuning: comparing Danfoss algorithms to E3, discussing PI settings (KP and TN), neutral band behavior, zone acceleration/deceleration, and how to export/copy controller settings to PDF for before/after records—then using ChatGPT to identify changes. They debate relief setpoints and high-pressure cutouts (including 130 bar/1885 psi references), question why certain pressure limits match, and complain about Danfoss gas cooler fan control relying on temperature instead of pressure, especially in cold weather. Brett explores IO configuration and general-purpose controllers while trying (and failing) to map sensor “S7,” then proposes relay-based fan bank staging as a workaround for EC motors that don’t turndown low enough. They also cover double digital compressor control, advising to set “frequency” scaling to 0–100 (capacity) rather than 0–60, and clarify analog output differences between IDCM modules and Copeland CoreSense (including 1–5V). The conversation shifts to parallel compression and ejector systems: setting up multi-ejector models/blocks, how logic may switch from high-pressure valves to ejectors, and concerns that ejectors/parallel compression can rob already-light medium-temp load. Reviewing piping/prints, they critique oil reservoir piping, note an oil vent differential of 2.4 bar as too low, discuss desuperheater risks in cold ambient conditions, and complain about pre-relief valves and gas cooler bypass as problematic “band-aids.” They wrap with Brett’s early Monday flight to Texas, jokes about being recognized on job sites, and their usual back-and-forth sarcasm and banter throughout.

Join Brett Wetzel and Kevin Compass at the Sporing booth in Vegas as they discuss the bustling week at Advanced Refrigeration Podcast. Hear about Vegas adventures, disastrous $40 breakfasts, and the latest in refrigeration technology like MT1 and Echelon to Ethernet over IP gateways. They dive deep into troubleshooting, leak detection scaling, and the pros and cons of different controllers and communication protocols. Get a sneak peek into various booths showcasing new CO2 chiller manufacturers, steel line sets, and much more. Plus, some fun banter about Texas BBQ, dealing with Scotsmen, and the intricacies of commissioning CO2 startups. Don't miss their humorous and insightful takes on all things refrigeration!

Join Brett Wetzel and Kevin Compass at the Sporing booth in Vegas as they discuss the bustling week at Advanced Refrigeration Podcast. Hear about Vegas adventures, disastrous $40 breakfasts, and the latest in refrigeration technology like MT1 and Echelon to Ethernet over IP gateways. They dive deep into troubleshooting, leak detection scaling, and the pros and cons of different controllers and communication protocols. Get a sneak peek into various booths showcasing new CO2 chiller manufacturers, steel line sets, and much more. Plus, some fun banter about Texas BBQ, dealing with Scotsmen, and the intricacies of commissioning CO2 startups. Don't miss their humorous and insightful takes on all things refrigeration!

In this episode of the Advanced Refrigeration Podcast, Brett Wetzel and Kevin Compass dive into an eclectic mix of topics - from freezing temperatures and snow blizzards to complex refrigeration systems. Our hosts are joined by special guest Chris Prom from Resource Data Management (RDM) who shares insights on case controllers, dealing with freezing cold temperatures, and the wonders of transcritical CO2 systems. They discuss everything from practical tips on handling unexpected issues, the quirks of different control units, to Chris's amusing relocation stories. Join us for a laughter-filled, yet informative deep dive into the world of advanced refrigeration!

In this episode of the Advanced Refrigeration Podcast, Brett Wetzel and Kevin Compass dive into an eclectic mix of topics - from freezing temperatures and snow blizzards to complex refrigeration systems. Our hosts are joined by special guest Chris Prom from Resource Data Management (RDM) who shares insights on case controllers, dealing with freezing cold temperatures, and the wonders of transcritical CO2 systems. They discuss everything from practical tips on handling unexpected issues, the quirks of different control units, to Chris's amusing relocation stories. Join us for a laughter-filled, yet informative deep dive into the world of advanced refrigeration!

Join hosts Brett Wetzel and Kevin Compass as they dive into the chilling world of refrigeration with guest Chris Prom from Resource Data Management (RDM). This episode is packed with humorous anecdotes, from battling Michigan blizzards to figuring out why your CO2 system isn’t behaving. Discover what it’s like to handle 14 inches of snow in Minnesota, learn about gas cooler strategies, and find out why splitting gas cooler fans is a game changer. Plus, get a sneak peek behind the scenes of RDM’s intuitive systems and Chris’s personal journey through the frosty labyrinth of HVAC-r. You won’t want to miss this jam-packed episode filled with tech tips, industry insights, and maybe a little too much info on South Carolina twangs. Be prepared for a frosty adventure!

Join hosts Brett Wetzel and Kevin Compass as they dive into the chilling world of refrigeration with guest Chris Prom from Resource Data Management (RDM). This episode is packed with humorous anecdotes, from battling Michigan blizzards to figuring out why your CO2 system isn’t behaving. Discover what it’s like to handle 14 inches of snow in Minnesota, learn about gas cooler strategies, and find out why splitting gas cooler fans is a game changer. Plus, get a sneak peek behind the scenes of RDM’s intuitive systems and Chris’s personal journey through the frosty labyrinth of HVAC-r. You won’t want to miss this jam-packed episode filled with tech tips, industry insights, and maybe a little too much info on South Carolina twangs. Be prepared for a frosty adventure!

A Shoot the SH&T CO2 Episode, Do You Know The Muffin Man??? Episode 503 VideoJoin hosts Brett Wetzel and Kevin Compass in a hilarious and informative episode of the Advanced Refrigeration Podcast. From being yelled at by a Mickey Mouse voice to diving into complex HVAC issues, this episode covers it all. The discussion ranges from CO2 system troubleshooting, programming intricacies, calcium-clogged condensers, and the challenges of startups, all while navigating tech mishaps and the occasional laugh at a crappy hotel. Kevin and Brett manage to balance serious HVAC knowledge with plenty of humor, making this a must-listen for any HVAC professional!

Join hosts Brett Wetzel and Kevin Compass in a hilarious and informative episode of the Advanced Refrigeration Podcast. From being yelled at by a Mickey Mouse voice to diving into complex HVAC issues, this episode covers it all. The discussion ranges from CO2 system troubleshooting, programming intricacies, calcium-clogged condensers, and the challenges of startups, all while navigating tech mishaps and the occasional laugh at a crappy hotel. Kevin and Brett manage to balance serious HVAC knowledge with plenty of humor, making this a must-listen for any HVAC professional!

We Went From Screws To CO2 Oil Issues, Was it just New Years --Episode 502 AudioJoin Brett Wetzel and Kevin Compass in this hilarious and insightful episode of the Advanced Refrigeration Podcast. They wrap up 2025 and welcome 2026 with a deep dive into the challenges faced over the past week, including basement floods, screw compressor oil issues, and tiling a bathroom. Hear about Kevin's late-night ordeal with a busted thermometer and Brett's troubleshooting journey involving oil reservoir pressure drops and differential issues. This episode is packed with both technical insights and laugh-out-loud moments, perfect for HVAC professionals and anyone who enjoys a bit of chaos in their day.

We Went From Screws To CO2 Oil Issues, Was it just New Years --Episode 502 VideoJoin Brett Wetzel and Kevin Compass in this hilarious and insightful episode of the Advanced Refrigeration Podcast. They wrap up 2025 and welcome 2026 with a deep dive into the challenges faced over the past week, including basement floods, screw compressor oil issues, and tiling a bathroom. Hear about Kevin's late-night ordeal with a busted thermometer and Brett's troubleshooting journey involving oil reservoir pressure drops and differential issues. This episode is packed with both technical insights and laugh-out-loud moments, perfect for HVAC professionals and anyone who enjoys a bit of chaos in their day.

Part 2 With Matt Asbill

VFDS Diagnosis and Compressors Sizing With Matt Asbill From Motion industries- Episode 501 Part 2 Audio

VFDS Diagnosis and Compressors Sizing With Matt Asbill From Motion industries-Part 1 Episode 452Join hosts Brett Wetzel and Kevin Compass in this hilarious and informative episode of the Advanced Refrigeration Podcast, as they navigate the complex world of Variable Frequency Drives (VFDs) and refrigeration systems. With their guest Matt Asbill from Motion Industries, they discuss everything from compressor sizing and the peculiarities of using different pressure transducers, to the quirks of CO2 rack systems and the mysteries behind various refrigeration set points. Whether it's dissecting the intricacies of VFD programming, recounting ridiculous service calls, or debating if remanufactured compressors are more trouble than they're worth, this episode is packed with both laughs and valuable HVAC insights. Perfect for anyone who's ever scratched their head at a VFD or chuckled at an HVAC mishap!

VFDS Diagnosis and Compressors Sizing With Matt Asbill From Motion industries-Part 1 Episode 452Join hosts Brett Wetzel and Kevin Compass in this hilarious and informative episode of the Advanced Refrigeration Podcast, as they navigate the complex world of Variable Frequency Drives (VFDs) and refrigeration systems. With their guest Matt Asbill from Motion Industries, they discuss everything from compressor sizing and the peculiarities of using different pressure transducers, to the quirks of CO2 rack systems and the mysteries behind various refrigeration set points. Whether it's dissecting the intricacies of VFD programming, recounting ridiculous service calls, or debating if remanufactured compressors are more trouble than they're worth, this episode is packed with both laughs and valuable HVAC insights. Perfect for anyone who's ever scratched their head at a VFD or chuckled at an HVAC mishap!

Join hosts Brett Wetzel and Kevin Compass in this hilarious yet informative episode of the Advanced Refrigeration Podcast. They dive into a chaotic week filled with CO2 rack crashes, flash tank issues, and epic memes. Listen in as they troubleshoot complex refrigeration problems, discuss the importance of accurate subcooling, and explore advanced diagnostics using the Bitzer app. Perfect for HVAC pros who love a good laugh and the thrill of technical challenges. Don't miss the antics and insights in this jam-packed episode!

Join hosts Brett Wetzel and Kevin Compass in this hilarious yet informative episode of the Advanced Refrigeration Podcast. They dive into a chaotic week filled with CO2 rack crashes, flash tank issues, and epic memes. Listen in as they troubleshoot complex refrigeration problems, discuss the importance of accurate subcooling, and explore advanced diagnostics using the Bitzer app. Perfect for HVAC pros who love a good laugh and the thrill of technical challenges. Don't miss the antics and insights in this jam-packed episode!

Ever feel like you're morphing into the locals? Join me in this hilariously relatable vlog as I battle through an exhausting week filled with traffic woes and sleepless nights. Witness my slow transformation as I start sounding more and more like the people around me. Whether you're in need of a good laugh or just want to see someone else as tired as you are, this episode is your perfect pick-me-up!

Ever feel like you're morphing into the locals? Join me in this hilariously relatable vlog as I battle through an exhausting week filled with traffic woes and sleepless nights. Witness my slow transformation as I start sounding more and more like the people around me. Whether you're in need of a good laugh or just want to see someone else as tired as you are, this episode is your perfect pick-me-up!

In this hysterical episode of the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass tackle a series of CO2 startup disasters and share amusing tales from the field. From maneuvering oversized manifolds to enduring 43-degree machine rooms, the guys recount their week's most head-scratching moments. They also break down tricky Danfoss configurations, including mysterious PI calculations and the intricacies of addressing E1K controllers. Whether you're in it for the technical deep dives or just the chuckles, you're in for a wild refrigerant ride!

In this hysterical episode of the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass tackle a series of CO2 startup disasters and share amusing tales from the field. From maneuvering oversized manifolds to enduring 43-degree machine rooms, the guys recount their week's most head-scratching moments. They also break down tricky Danfoss configurations, including mysterious PI calculations and the intricacies of addressing E1K controllers. Whether you're in it for the technical deep dives or just the chuckles, you're in for a wild refrigerant ride!

In this episode of the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass dive into the intricacies of CO2 systems, sharing tips on maximizing efficiency and minimizing waste. From charging hacks and troubleshooting Danfoss controllers to wrestling with pressure washer hoses and sight glasses, the duo provides a mix of technical insights and humorous banter. Plus, discover why using the right charging setup can save you time, money, and headaches. Perfect for HVAC professionals looking for both practical advice and a good laugh

In this episode of the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass dive into the intricacies of CO2 systems, sharing tips on maximizing efficiency and minimizing waste. From charging hacks and troubleshooting Danfoss controllers to wrestling with pressure washer hoses and sight glasses, the duo provides a mix of technical insights and humorous banter. Plus, discover why using the right charging setup can save you time, money, and headaches. Perfect for HVAC professionals looking for both practical advice and a good laugh!

Join Brett Wetzel and Kevin Compass in this humorous episode of the Advanced Refrigeration Podcast as they navigate the ups and downs of CO2 startups, tackle a grueling number of case controllers, and discuss troubleshooting tips for refrigeration systems. From battling plastic clips to discussing the intricacies of hot gas defrosts in CO2 environments, the hosts share a raw and relatable look into the often chaotic yet never boring world of HVAC. Perfect for any technician looking for a mix of technical insights and hearty laughs!

Join Brett Wetzel and Kevin Compass in this humorous episode of the Advanced Refrigeration Podcast as they navigate the ups and downs of CO2 startups, tackle a grueling number of case controllers, and discuss troubleshooting tips for refrigeration systems. From battling plastic clips to discussing the intricacies of hot gas defrosts in CO2 environments, the hosts share a raw and relatable look into the often chaotic yet never boring world of HVAC. Perfect for any technician looking for a mix of technical insights and hearty laughs!