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    Technology

    Advanced Refrigeration Podcast

    This podcast is for the education of supermarket and commercial refrigeration systems.
    We will be going over operation troubleshooting and diagnostic on multiple types of systems including mechanical and energy management

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    Copyright: © Brett Wetzel & Kevin Compass

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    Latest Episodes:
    Parallel Compression, Oil System Differences & Brett's Flat in Bat Country - Episode-524 Audio Jun 15, 2026
    Show notes

    Parallel Compression, Oil System Differences & Brett's Flat in Bat Country - Episode-524

    Hotel Wi‑Fi, Flat Tires & Parallel Compression Chaos | Advanced Refrigeration Podcast

    Brett Wetzel and Kevin Dumpless kick off this episode from a wildly bright SpringHill Suites in Fort Worth after travel chaos, traffic frustration, and a flat tire that dropped pressure to zero in record time. From there, they jump into real-world rack work: long weeks on a rack change-out, frustrations with manufacturers leaving no room for core pullers on EPRs/A8 valves, and the familiar pain of electrical contractors who don’t read prints. Kevin walks through a parallel compression CO₂ startup, including staging issues tied to flash gas bypass valve capacity, oil reservoir differential problems, and how a weighted check valve maintains oil flow when flash tank pressures rise. They compare oil separator strategies, discuss ICAD reliability versus steppers, and highlight a dock reheat/dehumidification setup using defrost return gas and controls.

    Parallel Compression, Oil System Differences & Brett's Flat in Bat Country - Episode-524 Video Jun 15, 2026
    Show notes

    Parallel Compression, Oil System Differences & Brett's Flat in Bat Country - Episode-524 Video

    Hotel Wi‑Fi, Flat Tires & Parallel Compression Chaos | Advanced Refrigeration Podcast

    Brett Wetzel and Kevin Dumpless kick off this episode from a wildly bright SpringHill Suites in Fort Worth after travel chaos, traffic frustration, and a flat tire that dropped pressure to zero in record time. From there, they jump into real-world rack work: long weeks on a rack change-out, frustrations with manufacturers leaving no room for core pullers on EPRs/A8 valves, and the familiar pain of electrical contractors who don’t read prints. Kevin walks through a parallel compression CO₂ startup, including staging issues tied to flash gas bypass valve capacity, oil reservoir differential problems, and how a weighted check valve maintains oil flow when flash tank pressures rise. They compare oil separator strategies, discuss ICAD reliability versus steppers, and highlight a dock reheat/dehumidification setup using defrost return gas and controls.

    Changing Racks Shooting The Sh$T & I Got Screeched With A Gold Medalist in NewFoundLand Episode-523 Jun 08, 2026
    Show notes

    Newfoundland Time, 43-Year-Old Hill Racks, and CO2 Mini Packs Gone Wild | Advanced Refrigeration Podcast

    Brett and Kevin open the Advanced Refrigeration Podcast with travel chaos and stories from Brett’s Newfoundland training trip, including sightseeing, getting “screeched in,” and learning about the 2 and a half-hour time zone. Kevin contrasts with a rough week changing out 43-year-old Hill racks for new Hussmann racks, dealing with tight valve layouts, vacuum work, reused refrigerant, and major electrical/control complications in an old store with fuse buckets. They explain what Atron surge receivers are, why they fail, and common retrofit approaches. The conversation shifts to small Walmart CO2 “baby” racks and common field issues: critical charging challenges with heavy tanks, relief valves popping due to 650-psi-rated filter driers, problematic relief piping requirements, and the need for better high-pressure serviceable solutions. They close by teasing a deeper future episode on these single CO2 units and their controllers.

    Changing Racks, Shooting The Sh$T, & I Got Screeched With A Gold Medalist in Newfoundland Episode-523 Jun 08, 2026
    Show notes

    Changing Racks Shooting The Sh$T & I Got Screeched With A Gold Medalist in NewFoundLand Episode-523

    Newfoundland Time, 43-Year-Old Hill Racks, and CO2 Mini Packs Gone Wild | Advanced Refrigeration Podcast

    Brett and Kevin open the Advanced Refrigeration Podcast with travel chaos and stories from Brett’s Newfoundland training trip, including sightseeing, getting “screeched in,” and learning about the 2 and a half-hour time zone. Kevin contrasts with a rough week changing out 43-year-old Hill racks for new Hussmann racks, dealing with tight valve layouts, vacuum work, reused refrigerant, and major electrical/control complications in an old store with fuse buckets. They explain what Atron surge receivers are, why they fail, and common retrofit approaches. The conversation shifts to small Walmart CO2 “baby” racks and common field issues: critical charging challenges with heavy tanks, relief valves popping due to 650-psi-rated filter driers, problematic relief piping requirements, and the need for better high-pressure serviceable solutions. They close by teasing a deeper future episode on these single CO2 units and their controllers.

    VFD and Controller Settings Does It Matter ??? And Kevin Loves His Neighbors Episode - 522 Video Jun 01, 2026
    Show notes

    VFD and Controller Settings Does It Matter ??? And Kevin Loves His Neighbors Episode - 522


    Stop the VFD Hunt: Fixing 0–10V Scaling, Ramps, and Skip Frequencies (Advanced Refrigeration Podcast)


    Brett Wetzel and Kevin Compass kick off the Advanced Refrigeration Podcast with early-morning chaos, then dive into a common rack problem: VFD and controller settings that don’t match, causing suction oscillation and valve hunting. Using an E3/E2-style controller and a Danfoss drive example, they explain correcting the 0–10V analog output scaling so the drive responds immediately (often setting the low end to about 5V and matching minimum reference), aligning minimum/maximum references and speed limits (e.g., typical low-speed limits around 28–30 Hz and high limits around 60 Hz), and avoiding overly aggressive ramp rates that worsen overshoot. They also discuss using skip/bypass frequencies to eliminate resonance that shakes racks, breaks clamps, and damages piping, noting common troublesome ranges seen on certain compressors.

    VFD and Controller Settings Does It Matter ??? And Kevin Loves His Neighbors Episode - 522 Audio Jun 01, 2026
    Show notes

    VFD and Controller Settings Does It Matter ??? And Kevin Loves His Neighbors Episode - 522Stop the VFD Hunt: Fixing 0–10V Scaling, Ramps, and Skip Frequencies (Advanced Refrigeration Podcast)Brett Wetzel and Kevin Compass kick off the Advanced Refrigeration Podcast with early-morning chaos, then dive into a common rack problem: VFD and controller settings that don’t match, causing suction oscillation and valve hunting. Using an E3/E2-style controller and a Danfoss drive example, they explain correcting the 0–10V analog output scaling so the drive responds immediately (often setting the low end to about 5V and matching minimum reference), aligning minimum/maximum references and speed limits (e.g., typical low-speed limits around 28–30 Hz and high limits around 60 Hz), and avoiding overly aggressive ramp rates that worsen overshoot. They also discuss using skip/bypass frequencies to eliminate resonance that shakes racks, breaks clamps, and damages piping, noting common troublesome ranges seen on certain compressors.

    TekLab TK4 Compressor Oil Level Control, Kevin's in Georgia??--- Episode 521 Audio May 25, 2026
    Show notes

    TekLab TK4 Compressor Oil Level Control, Kevin's in Georgia??--- Episode 521

    TechLab TK4 Oil Level Controls: Dongles, Alarms, and Why “Limit Injections” Can Kill a Rack


    Brett and Kevin swap war stories from a sweltering Georgia service call where Kevin quickly solves a persistent comm issue caused by a fallen rod rubbing through and shorting a comm wire, while also noticing a dangerously supported main water line. Back home, they dig into TechLab oil level controls (TK4/TK1), rant about hard-to-find manufacturer documentation, and walk through setting up the Bluetooth dongle/software to communicate, view status, and manually cycle the solenoid to watch oil-fill timing. They highlight how the “limit injections” setting can stop refilling during an alarm and shut down a rack, discuss injection/monitoring timing tradeoffs for low vs. medium temp systems, and note the pressure differential setting doesn’t appear to change timing automatically. They compare TechLab favorably to Kriwan, show teardown observations, and joke about laptops, metric screws, and oil-shower failures.

    TekLab TK4 Compressor Oil Level Control, Kevin's in Georgia??--- Episode 521 - Video May 25, 2026
    Show notes

    TekLab TK4 Compressor Oil Level Control, Kevin's in Georgia??--- Episode 521

    TechLab TK4 Oil Level Controls: Dongles, Alarms, and Why “Limit Injections” Can Kill a Rack


    Brett and Kevin swap war stories from a sweltering Georgia service call where Kevin quickly solves a persistent comm issue caused by a fallen rod rubbing through and shorting a comm wire, while also noticing a dangerously supported main water line. Back home, they dig into TechLab oil level controls (TK4/TK1), rant about hard-to-find manufacturer documentation, and walk through setting up the Bluetooth dongle/software to communicate, view status, and manually cycle the solenoid to watch oil-fill timing. They highlight how the “limit injections” setting can stop refilling during an alarm and shut down a rack, discuss injection/monitoring timing tradeoffs for low vs. medium temp systems, and note the pressure differential setting doesn’t appear to change timing automatically. They compare TechLab favorably to Kriwan, show teardown observations, and joke about laptops, metric screws, and oil-shower failures.

    CO2 LMP Racks Hot Gas & What The Heck Is A DTR Valve ?? Episode 520 Video May 18, 2026
    Show notes

    CO2 LMP Racks Hot Gas & What The Heck Is A DTR Valve ?? Episode 520 Video

    LMP Rack Deep Dive: Hot Gas Defrost, Superheat Mitigation & Refrigeration “Witchcraft”


    Brett Wetzel and Kevin Compass kick off the Advanced Refrigeration Podcast with weekend plans and a chaotic start featuring mystery music and van-recorded audio, then jump into Kevin’s hectic week swapping out 40-year-old racks and venting about painfully unserviceable EPR and valve layouts while converting controls from CPC to Danfoss. Brett outlines a common VFD control issue where a 0–100% signal causes deadband, aggressive ramping, and cycling, teeing up a future demo with virtual displays. The main discussion breaks down an LMP rack P&ID with heat reclaim, low-temp hot gas defrost, suction setpoints, superheat mitigation via inversely controlled valves and plate heat exchangers, discharge pressure regulation and staged valve reopening after defrost, load shedding, oil separation strategy, and auxiliary heat exchanger quirks, then detours into cool gas defrost debate and a cutaway look at a Venturi-style “injector” device used to cool discharge gas.

    CO2 LMP Racks Hot Gas & What The Heck Is A DTR Valve ?? Episode 520 Audio May 18, 2026
    Show notes

    LMP Rack Deep Dive: Hot Gas Defrost, Superheat Mitigation & Refrigeration “Witchcraft”


    Brett Wetzel and Kevin Compass kick off the Advanced Refrigeration Podcast with weekend plans and a chaotic start featuring mystery music and van-recorded audio, then jump into Kevin’s hectic week swapping out 40-year-old racks and venting about painfully unserviceable EPR and valve layouts while converting controls from CPC to Danfoss. Brett outlines a common VFD control issue where a 0–100% signal causes deadband, aggressive ramping, and cycling, teeing up a future demo with virtual displays. The main discussion breaks down an LMP rack P&ID with heat reclaim, low-temp hot gas defrost, suction setpoints, superheat mitigation via inversely controlled valves and plate heat exchangers, discharge pressure regulation and staged valve reopening after defrost, load shedding, oil separation strategy, and auxiliary heat exchanger quirks, then detours into cool gas defrost debate and a cutaway look at a Venturi-style “injector” device used to cool discharge gas.

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