Advanced Refrigeration Podcast by Brett Wetzel & Kevin Compass

October 26, 2026Episode 4351 min

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

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.

October 26, 2026Episode 4351 min

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

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.

October 19, 2026Episode 421 hr 2 min

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

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

October 19, 2026Episode 421 hr 2 min

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

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

October 12, 2026Episode 4156 min

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

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.

October 12, 2026Episode 4156 min

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

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.

October 5, 2026Episode 4040 min

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

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.

October 5, 2026Episode 4040 min

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

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.

September 28, 2026Episode 3955 min

Cold Ambient Flooded Condenser, & It's Not Time For Xmas Stuff, Brett's In Nashville Episode 539 Audio

Cold Ambient Flooded Condenser, & It's Not Time For Xmas Stuff, Brett's In Nashville Episode 539 Low Ambient Chaos: Headmasters, Flooded Condensers, and Why Your Receiver’s Screaming On the Advanced Refrigeration Podcast, Brett Wetzel and Kevin Compas rant about stores pushing Christmas displays too early, then dive into low-ambient season nuisance calls: low receivers, liquid feed problems, and winter headaches caused by tight holdbacks, bad summer startups, and improperly set ORI/headmaster valves. They discuss standalone case-controller frustrations where settings won’t save and firmware quirks break lights and fans unless defrost times fall between midnight and 3:00 AM. The episode covers troubleshooting smoking-hot receivers and cool condensers from headmaster bypassing, proper flooded-condenser charging using Sporlan charts (and tools like an Excel calculator), and why blindly adding refrigerant can backfire—especially when condenser split/pump-out issues trap liquid. They also warn about fan-splitting controls, uneven condenser piping, rooftop suction lines condensing liquid, and Chicago “fireman’s dump” lines causing additional cold-weather problems.

September 28, 2026Episode 3955 min

Cold Ambient Flooded Condenser, & It's Not Time For Xmas Stuff, Brett's In Nashville Episode 539 Video

Cold Ambient Flooded Condenser, & It's Not Time For Xmas Stuff, Brett's In Nashville Episode 539 Low Ambient Chaos: Headmasters, Flooded Condensers, and Why Your Receiver’s Screaming On the Advanced Refrigeration Podcast, Brett Wetzel and Kevin Compas rant about stores pushing Christmas displays too early, then dive into low-ambient season nuisance calls: low receivers, liquid feed problems, and winter headaches caused by tight holdbacks, bad summer startups, and improperly set ORI/headmaster valves. They discuss standalone case-controller frustrations where settings won’t save and firmware quirks break lights and fans unless defrost times fall between midnight and 3:00 AM. The episode covers troubleshooting smoking-hot receivers and cool condensers from headmaster bypassing, proper flooded-condenser charging using Sporlan charts (and tools like an Excel calculator), and why blindly adding refrigerant can backfire—especially when condenser split/pump-out issues trap liquid. They also warn about fan-splitting controls, uneven condenser piping, rooftop suction lines condensing liquid, and Chicago “fireman’s dump” lines causing additional cold-weather problems.

Advanced Refrigeration Podcast

About the show

Listen to episodes

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

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

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

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

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

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

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

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

Cold Ambient Flooded Condenser, & It's Not Time For Xmas Stuff, Brett's In Nashville Episode 539 Audio

Cold Ambient Flooded Condenser, & It's Not Time For Xmas Stuff, Brett's In Nashville Episode 539 Video

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