Learn more about Refrigeration Mentor Customized Technical Training Programs at www.refrigerationmentor.com/courses

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In this conversation, I'm sharing the most important things technicians need to know to become experts at supermarket refrigeration. These include mastering the fundamentals like understanding the piping and instrumentation diagram (P&ID), wiring diagrams, IO schedules, and refrigeration schedules. I also discuss the process I use to help refrigeration technicians level up faster and become confident problem solvers, which in turn dramatically reduces troubleshooting time, cuts down on callbacks, and helps refrigeration techs approach service calls with a completely different mindset.

In this episode, we discuss:

(3:10) Diagnosing CO2 gas cooler pressure issues using trend graphs

(7:05) How technicians are learning to think differently

(11:20) Four key documents every refrigeration tech must understand

(16:15) Why data, trend graphs, and valve percentages reveal the real problem

(21:30) The problem with traditional training

(26:00) Continuous microlearning

(31:45) Strong troubleshooting fundamentals

(36:30) Building a global community of refrigeration technicians

(41:20) How to take on bigger CO2 and supermarket challenges

Helpful Links & Resources:

Episode 251. Supermarket Refrigeration Service and Troubleshooting Tips

Episode 299. Basic Refrigeration 101

Episode 332. 7 Transcritical CO2 Refrigeration Service & Maintenance Tips

Learn more about Refrigeration Mentor Customized Technical Training Programs at www.refrigerationmentor.com/courses

Join the Refrigeration Mentor Hub here

In this episode, we're breaking down how to prevent supermarket callbacks - and why the issue is rarely the rack itself. Callbacks crush margins, burn out technicians, frustrate service managers, and erode customer confidence. It comes down to diagnosing the root cause of issues, which almost always comes back to your process as a refrigeration technician: weak fundamentals, poor understanding of rack sequence of operation, misdiagnosis, and a lack of structured troubleshooting. We also discuss how structured development programs dramatically reduce callbacks, improve technician confidence, and increase gross margins for your company.

In this episode, we cover:

(02:45) The cost of refrigeration service callbacks

(05:30) Cause of most refrigeration service callbacks

(07:45) Weak fundamentals and missing rack sequence of operation steps

(10:10) The most common misdiagnoses in supermarket refrigeration

(13:20) Why control strategies matter

(16:40) The danger of being a "parts changer"

(19:30) How expert techs think differently

(23:30) How training reduces callbacks and grows better businesses

Helpful Links & Resources

Episode 350. Supermarket Refrigeration Tips and Tricks with Robert Ochs

Episode 306. Mastering Supermarket Service Calls with Andrew Freeburg

Episode 251. Supermarket Refrigeration Service and Troubleshooting Tips

Learn more about Refrigeration Mentor Customized Technical Training Programs at www.refrigerationmentor.com/courses

Join the Refrigeration Mentor Hub here

In this episode, we're joined by Refrigeration Mentor Community Ambassadors Andrew Freeburg and Erik Holland ot share some call stories from the field, including a severely overheated semi-hermetic compressor teardown. We also walk through safely isolating, recovering, and cleaning or replacing TXV screens/strainers and also common refrigerated case freeze-up causes and defrost strategy. Interested in joining the next Refrigeration Mentor Community Meetup? Click here.

In this episode, we cover:

(01:56) Copper Plating Moisture Clues

(04:32) Oil Color And System Cleanup

(08:05) Pumpdown And Screen Cleaning

(10:56) Case Freeze Up Root Causes

(14:07) Suction Liquid Line Routing Fix

(16:12) Airflow Blockage Issues

(16:43) Coil Gaps and Bypass

(19:00) Defrost Strategy Breakdown

(21:05) Humidity and Data Trends

(23:19) What Not to Adjust First

(24:34) Wild Leg Voltage Explained

(27:20) Safety Metering Lessons

Helpful Links & Resources:

Episode 365. Compressor Inspections and Troubleshooting Stories from the Field

Episode 329. The Ins & Outs of Compressors

Episode 295. A Compressor Story: The Key to Faster Troubleshooting

Learn more about Refrigeration Mentor Customized Technical Training Programs at www.refrigerationmentor.com/courses

Join the Refrigeration Mentor Hub here

This conversation was from our latest Refrigeration Mentor Community Meetup, talking about refrigeration controls and electrical systems with Andrew Freeburg and Erik Holland. We cover control fundamentals such as transformers, multiplex board setup, communication basics, polarity, baud rate, cable practices, and fail-safe settings for loads. We also discuss how to build confidence through competence - studying, repetition, applying skills on real systems, asking questions, using community support, setting goals, and learning by teaching. Interested in joining the next Refrigeration Mentor Community Meetup? Click here.

In this episode, we discuss:

(00:30) Confidence and Competence

(06:02) Learning How to Learn

(09:58) Setting Goals and Support Groups

(15:42) Dunning Kruger Effect

(21:58) Electrical Basics and Safety

(22:21) Center Tap Transformers

(24:30) Multiplex Boards and Dip Switches

(25:59) Binary Addressing Switches

(26:37) Power and Comms Terminals

(27:11) Comms Voltage and LEDs

(29:40) Wiring Noise and Shielding

(30:47) Fail Safe Dip Switches

(33:46) Analog Inputs and Outputs

(34:54) Software vs Hardware Logic

(39:06) Panel Safety Basics

(43:30) Meter Testing and Ratings

(47:47) Electrical Safety Mindset

Helpful Links & Resources:

Episode 371. A 6-Step Process for Faster Electrical Troubleshooting

Episode 215. Understanding Refrigeration System Controls with Larry Herman of Redline Control Design

Learn more about Refrigeration Mentor Customized Technical Training Programs at www.refrigerationmentor.com/courses

Join the Refrigeration Mentor Hub here

In this episode, we're talking with Rob Ochs of Recold to unpack his long and successful refrigeration career - from rack refrigeration, to global sales and adiabatic coolers. He shrares practical tips for technicians and engineers working with modern systems, including CO2. Rob also covers career lessons, communication advice and troubleshooting tips for technicians to help reduce callbacks and make smarter equipment decisions. This episode was recorded live at the 2026 AHR Expo.

(0:40) Rob Ochs' Career Path

(2:09) Navigating Career Transitions in Refrigeration

(5:49) Why Refrigeration Techs Should Learn Design

(10:29) Condenser and Gas Cooler Sizing 101

(14:34) Nameplates, Rack Summaries, and Finding Mismatches

(20:17) Critical Charge vs DX

(22:52) Finding Mentors

(24:06) Condenser Fan Strategies

(29:11) Latent Gas Defrost Explained

(33:36) Adiabatic vs Air Gas Coolers

(39:44) Pad Efficiency and Seasonal Pad Removal

Helpful Links & Resources:

Follow Robert on LinkedIn

Recold

AHR Expo

Episode 350. Supermarket Refrigeration Tips and Tricks with Robert Ochs

Episode 271. The Inspiring Refrigeration Journey of Robert Ochs

Learn more about Refrigeration Mentor Customized Technical Training Programs at www.refrigerationmentor.com/courses

Join the Refrigeration Mentor Hub here

In this episode, we're talking about commercial refrigeration trends and technician realities in the UK/Europe versus North America with UK-based Refrigeration Consultant, Brian Churchyard. We cover the transition to CO2 transcritical, as well as skilled-trades shortages, wage and workload pressures, and the need for continual upskilling across service, maintenance, design, installation, and commissioning sectors of refrigeration. Brian also shares some hands-on fundamentals and things for new technicians to be excited about. This episode was recorded live at the 2026 AHR Expo.

In this episode, we discuss:

(0:51) Brian's Journey: From Service Engineer to Supermarket Head of Engineering

(3:30) Refrigeration Trends in Europe

(6:01) A2L Safety, Flammability Context & Design Risk Mitigation

(10:48) Upskilling for the Low-Carbon Transition

(11:24) The Skilled Trades Shortage

(14:55) Pay, Workload & Market Pressures

(17:03) Attracting New Refrigeration Professionals

(18:54) Building Strong Refrigeration Techs Faster

(20:06) Customer Relationships and Clear Communication

(22:54) Refrigeration Controls

(23:33) Omega Solutions Now Data

(31:08) Refrigeration Industry Outlook

(34:27) Advice for New Refrigeration Technicians

Helpful Links & Resources:

Omega Solutions Now Data

Episode 374. Growing the Refrigeration Industry Globally with World Refrigeration Day Founder, Steve Gill

Episode 285. CO2 Experts: Transitioning to CO2 as a Service Technician Q & A with Andrew Freeburg

Episode 340. Basics of CO2 Controls with Kevin Mullis (Part 1 of 4)

Learn more about Refrigeration Mentor Customized Technical Training Programs at www.refrigerationmentor.com/courses

Join the Refrigeration Mentor Hub here

In this episode, we're joined by UK-based Refrigeration Consultant Steve Gill to talk about the refrigeration industry's impact around the world - enabling travel, preserving food, vaccines, medicines, supporting data centers and more. Steve started World Refrigeration Day (June 26) in 2019 and makes a special announcement about the 2026 theme on this episode - listen to find out! We also discuss practical outreach ideas to help promote and grow the refrigeration industry around the world. This episode was recorded live at the 2026 AHR Expo.

In this episode, we discuss:

(1:31) Steve's Refrigeration Journey: From Tools to Global Consulting

(3:05) Promoting Refrigeration to Students

(5:51) Origin of World Refrigeration Day

(14:09) Outreach Ideas for the Refrigeration Industry

(16:49) Announcing the 2026 World Refrigeration Day Theme

(17:42) What "Cool Intelligence" Really Means in Refrigeration

(21:26) Support & Sponsorshipfor World Refrigeration Day

(23:19) AI in Refrigeration

(26:17) Training & Mentorshipin Refrigeration

Helpful Links & Resources:

https://worldrefrigerationday.org/

https://www.ahrexpo.com/

Episode 320. Celebrating World Refrigeration Day

Episode 324.  Using AI To Learn and Troubleshoot Refrigeration Systems

Join the Refrigeration Mentor Hub here

Learn more about Refrigeration Mentor Customized Technical Training Programs at www.refrigerationmentor.com/courses

In this episode, we're talking about installation prep for CO2 refrigeration. I'm joined by longtime refrigeration technician and Refrigeration Mentor Community Ambassador Andrew Freeburg to discuss CO2 system installation, design, evacuation, and pressure testing, diving into best practices and common challenges. This episode provides valuable tips for refrigeration technicians looking to expand their knowledge and expertise in handling CO2 systems. This episode was recorded live during one of our regular Refrigeration Mentor Community Meetups. Join the next meetup here.

In this episode, we cover:

(1:37) Dealing with Pain and Injuries on the Job

(8:06) Training Apprentices Effectively

(16:33) Insights from the HR Show

(17:50) CO2 System Design and Installation

(34:24) Understanding Pressure Ratings and Conversions

(35:40) Installation Prep for CO2 Systems

(36:24) Proper Support and Slope for Piping

(38:15) Brazing and Nitrogen Purging

(38:48) Setting Cases and Proper Installation Practices

(40:06) Following Manufacturer Specifications

(41:57) Expansion Loops and Traps

(51:42) Pressure Testing Procedures

(57:29) Triple Evacuation and Deep Vacuum

Helpful Links & Resources:

Episode 160: Things to Know When Installing and Servicing CO2 Refrigeration Systems

Episode 285. CO2 Experts: Transitioning to CO2 as a Service Technician Q & A with Andrew Freeburg

Episode 81. Challenges Faced When Installing CO2 Systems