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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:
    More CO2 Blast Freezers And WTH Is A Surge Drum, & What About MASS FLOW ?? Episode - 544 Video Nov 02, 2026
    Show notes

    More CO2 Blast Freezers And WTH Is A Surge Drum, & What About MASS FLOW ?? Episode - 544

    CO₂ Rack Startup From Hell: ICAD Firmware Resets, Allen-Bradley Pain, and 20 Gallons of Missing Oil


    On the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass unpack a miserable CO₂ spiral freezer rack startup that ran long, went sideways, and left one host stranded with one T-shirt and dwindling underwear. A blast freezer startup rep moved painfully slow, firmware updates on ICAD B controllers reset passwords to all zeros, and time was lost fighting a remote engineer over 20 mA feedback that pegged valves open. After finally starting the rack, they hit a major oil return problem—roughly 20 gallons added with little coming back—suspecting oil logging in the freezer’s liquid vapor separator/surge drum, possibly worsened as temperatures dropped to around -43°F suction. They review the rack’s piping (desuperheater, gas cooler, flash tank, heat exchangers, accumulator drain logic) and debate causes like separator sizing, violent vessel behavior, and the need for an oil return/skimmer-style cycle before product loads arrive.

    More CO2 Blast Freezers And WTH Is A Surge Drum, & What About MASS FLOW ?? Episode - 544 Audio Nov 02, 2026
    Show notes

    More CO2 Blast Freezers And WTH Is A Surge Drum, & What About MASS FLOW ?? Episode - 544

    CO₂ Rack Startup From Hell: ICAD Firmware Resets, Allen-Bradley Pain, and 20 Gallons of Missing Oil


    On the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass unpack a miserable CO₂ spiral freezer rack startup that ran long, went sideways, and left one host stranded with one T-shirt and dwindling underwear. A blast freezer startup rep moved painfully slow, firmware updates on ICAD B controllers reset passwords to all zeros, and time was lost fighting a remote engineer over 20 mA feedback that pegged valves open. After finally starting the rack, they hit a major oil return problem—roughly 20 gallons added with little coming back—suspecting oil logging in the freezer’s liquid vapor separator/surge drum, possibly worsened as temperatures dropped to around -43°F suction. They review the rack’s piping (desuperheater, gas cooler, flash tank, heat exchangers, accumulator drain logic) and debate causes like separator sizing, violent vessel behavior, and the need for an oil return/skimmer-style cycle before product loads arrive.

    Blast Freezer Convo, & A Loop Sequencer For EPR Control, And A Cross Over ?? Episode - 543 Video Oct 26, 2026
    Show notes

    Blast Freezer Convo, & A Loop Sequencer For EPR Control, And A Cross Over ?? Episode - 543

    CO2 Blast Freezer Startup Chaos + Taming Load-Shed Valves (PID Tuning Without Losing Your Mind)

    In this episode of the Advanced Refrigeration Podcast, Brett and Kevin recap a CO2 blast freezer rack startup in Minnesota, including a pump-down system with a flash tank setup and a 45-bar-rated rack that sparked questions. The startup went sideways when an oil reservoir appeared empty, oil was pumped in, a compressor kicked on unexpectedly, hydraulically hammered the high-pressure switch, and blew the compressor relief—spraying oil on Brett—after a TechLab relay locked the oil fill on. They then shift to ongoing work: dual-temp HFC island case startups and troubleshooting an underloaded low-temp rack that short-cycles compressors. Kevin shows how a CDS valve on a loop sequencer was hunting from 0–100% and how reducing P gain stabilized suction, then they discuss load shedding/crossover valves, energy tradeoffs, and practical PID tuning tips like filtering, throttle range, direct vs reverse action, and making one change at a time.

    Blast Freezer Convo, & A Loop Sequencer For EPR Control, And A Cross Over ?? Episode - 543 Audio Oct 26, 2026
    Show notes

    Blast Freezer Convo, & A Loop Sequencer For EPR Control, And A Cross Over ?? Episode - 543

    CO2 Blast Freezer Startup Chaos + Taming Load-Shed Valves (PID Tuning Without Losing Your Mind)

    In this episode of the Advanced Refrigeration Podcast, Brett and Kevin recap a CO2 blast freezer rack startup in Minnesota, including a pump-down system with a flash tank setup and a 45-bar-rated rack that sparked questions. The startup went sideways when an oil reservoir appeared empty, oil was pumped in, a compressor kicked on unexpectedly, hydraulically hammered the high-pressure switch, and blew the compressor relief—spraying oil on Brett—after a TechLab relay locked the oil fill on. They then shift to ongoing work: dual-temp HFC island case startups and troubleshooting an underloaded low-temp rack that short-cycles compressors. Kevin shows how a CDS valve on a loop sequencer was hunting from 0–100% and how reducing P gain stabilized suction, then they discuss load shedding/crossover valves, energy tradeoffs, and practical PID tuning tips like filtering, throttle range, direct vs reverse action, and making one change at a time.

    Flexible Combiners, CO2, SH, Liquid Injection, & Hotgas.. Anti Relief, and Oil Control Episode 542 Audio Oct 19, 2026
    Show notes

    Flexible Combiners, CO2, SH, Liquid Injection, & Hotgas.. Anti Relief, and Oil Control Episode 542

    CO2 Rack Chaos: Superheat Mitigation, Anti-Relief Headaches & Flex Combiner Fails


    Brett Wetzel and Kevin Compass catch up on a hectic pre-Thanksgiving workload, including MicroThermal programming surges, Walmart K2 case startups with inconsistent wiring, and struggles accessing newer Novar controllers due to password and tech support issues. They then walk through CO2 rack control logic using E3 flexible combiners, focusing on hot gas injection superheat mitigation, debating appropriate superheat cut-in/cut-out and how low superheat worsens oil carryover. They critique an anti-relief strategy near the flash tank for causing flat racks via dry ice sticking valves, and discuss a receiver hot gas injection scheme meant to maintain winter receiver pressure and oil differential, noting an apparent incomplete implementation. They also review overly complex oil separator pulsing logic, relay wear concerns, and argue standardized CO2 suction group control could eliminate much custom programming confusion

    Flexible Combiners, CO2, SH, Liquid Injection, & Hotgas.. Anti Relief, and Oil Control Episode 542 Video Oct 19, 2026
    Show notes

    Flexible Combiners, CO2, SH, Liquid Injection, & Hotgas.. Anti Relief, and Oil Control Episode 542

    CO2 Rack Chaos: Superheat Mitigation, Anti-Relief Headaches & Flex Combiner Fails


    Brett Wetzel and Kevin Compass catch up on a hectic pre-Thanksgiving workload, including MicroThermal programming surges, Walmart K2 case startups with inconsistent wiring, and struggles accessing newer Novar controllers due to password and tech support issues. They then walk through CO2 rack control logic using E3 flexible combiners, focusing on hot gas injection superheat mitigation, debating appropriate superheat cut-in/cut-out and how low superheat worsens oil carryover. They critique an anti-relief strategy near the flash tank for causing flat racks via dry ice sticking valves, and discuss a receiver hot gas injection scheme meant to maintain winter receiver pressure and oil differential, noting an apparent incomplete implementation. They also review overly complex oil separator pulsing logic, relay wear concerns, and argue standardized CO2 suction group control could eliminate much custom programming confusion

    Flexible Combiners In E3, What Are They??? , And Some Rae Corp Shenanigans Episode 541 Video Oct 12, 2026
    Show notes

    Flexible Combiners In E3, What Are They, And Some Rae Corp Shenanigans Episode 541


    Flexible Combiner 101 (E2/E3): Stop Blaming the Flexie for Everything


    On the Advanced Refrigeration podcast, Brett Wetzel and Kevin Compass start by troubleshooting a Raycorp CO2 skid startup where one pump won’t make differential despite drive and check-valve checks, concluding the pump is likely bad and difficult to replace due to skid framing and serviceability constraints. They then shift to a practical walkthrough of programming Copeland E2/E3/Site Supervisor “flexible combiners,” emphasizing that flexies are open applications and many tasks should use simpler sensor controls instead. They stress labeling inputs/outputs, using E3 tools like duplicate tabs for troubleshooting, lowering update time for testing, and avoiding common syntax/type errors. They demonstrate building a timer, a cut-in/cut-out fan control (including averaging sensors), and a leak-detector shutdown using if statements and network variable targets, recommending the flexible combiner programming supplement as a reference.

    Flexible Combiners In E3, What Are They??? , And Some Rae Corp Shenanigans - Episode 541 - Audio Oct 12, 2026
    Show notes

    Flexible Combiners In E3, What Are They, And Some Rae Corp Shenanigans Episode 541


    Flexible Combiner 101 (E2/E3): Stop Blaming the Flexie for Everything


    On the Advanced Refrigeration podcast, Brett Wetzel and Kevin Compass start by troubleshooting a Raycorp CO2 skid startup where one pump won’t make differential despite drive and check-valve checks, concluding the pump is likely bad and difficult to replace due to skid framing and serviceability constraints. They then shift to a practical walkthrough of programming Copeland E2/E3/Site Supervisor “flexible combiners,” emphasizing that flexies are open applications and many tasks should use simpler sensor controls instead. They stress labeling inputs/outputs, using E3 tools like duplicate tabs for troubleshooting, lowering update time for testing, and avoiding common syntax/type errors. They demonstrate building a timer, a cut-in/cut-out fan control (including averaging sensors), and a leak-detector shutdown using if statements and network variable targets, recommending the flexible combiner programming supplement as a reference.

    What Do You Want To Do Tonight Brain, Play With Carel And A Power Outage Episode 540 Video Oct 05, 2026
    Show notes

    What Do You Want To Do Tonight Brain, Play With Carel And A Power Outage Episode 540

    Target Box Misery, Flooding Charge Math, and CO₂ Controller Menus That Hate You | Advanced Refrigeration Podcast

    Brett Wetzel and Kevin Compass open the Advanced Refrigeration Podcast by venting about end-of-life Target “boxes,” including finding multiple units with low-pressure switches installed on the wrong side of service valves, creating dangerous no-cutout scenarios. Brett describes building and testing a custom flooding-charge calculator using condenser data and discusses oversized condensing units and winter operation while running some quick Bitzer/Copeland-style math for a low-temp R449A freezer. The conversation shifts to CO₂ systems and a Corel compressor controller walkthrough, covering passwords, “mask number” navigation used by tech support, alarm configuration, compressor enable/disable, start types (direct, part-winding, star-delta), equalization valves, device rotation logic, VFD/inverter settings, and transcritical controls for the high-pressure valve and receiver/BGV parameters, including pre-positioning, proportional/integral behavior, and safety limits.

    What Do You Want To Do Tonight Brain, Play With Carel And A Power Outage Episode 540 Audio Oct 05, 2026
    Show notes

    What Do You Want To Do Tonight Brain, Play With Carel And A Power Outage Episode 540

    Target Box Misery, Flooding Charge Math, and CO₂ Controller Menus That Hate You | Advanced Refrigeration Podcast

    Brett Wetzel and Kevin Compass open the Advanced Refrigeration Podcast by venting about end-of-life Target “boxes,” including finding multiple units with low-pressure switches installed on the wrong side of service valves, creating dangerous no-cutout scenarios. Brett describes building and testing a custom flooding-charge calculator using condenser data and discusses oversized condensing units and winter operation while running some quick Bitzer/Copeland-style math for a low-temp R449A freezer. The conversation shifts to CO₂ systems and a Corel compressor controller walkthrough, covering passwords, “mask number” navigation used by tech support, alarm configuration, compressor enable/disable, start types (direct, part-winding, star-delta), equalization valves, device rotation logic, VFD/inverter settings, and transcritical controls for the high-pressure valve and receiver/BGV parameters, including pre-positioning, proportional/integral behavior, and safety limits.

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