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In this episode, I'm sharing the top seven basics every supermarket refrigeration technician needs to master. These encompass the fundamentals like superheat, subcooling, compression ratio, refrigerant flow, wiring diagrams, ladder diagrams, P&IDs, refrigeration schedules and sequence of operations. We'll also discuss safe electrical troubleshooting and proper meter use, understanding rack operation and the importance of controls, sensors, and communication networks. Revisiting these basics - no matter how long you'be been in the industry - are crucial to eliminating guesswork, diagnosing issues more confidently, cutting troubleshooting time and reducing callbacks.

In this episode, we cover:

(00:48) Seven Basics of Supermarket Refrigeration

(00:55) Refrigeration Fundamentals

(02:09) Electrical Diagrams

(04:20) Meter Skills

(05:09) Supermarket Rack Operation Basics

(06:44) Case Components

(07:17) Refrigeration Controls

(11:18) Building Troubleshooting Habits

(13:43) Safety on Refrigeration Job Sites

Helpful Links & Resources:

CO2 Unfiltered

Episode 395. Basics of Refrigeration: Importance of Revisiting the Fundamentals

Episode 299. Basic Refrigeration 101

Episode 37. Refrigeration Fundamentals and Troubleshooting Training with HVAC Know It All

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 returning to refrigeration fundamentals and breaking down the foundations - compressor, condenser, metering device, evaporator, and refrigerant flow. We cover key checks like suction/discharge behavior, condenser air and pipe temperatures, subcooling, fan operation, TXV function, and calculating superheat to prevent liquid or wet gas returning to the compressor. This episode also includes practical tips from the field, including smarter ways to handle oil checks, condenser coil cleaning techniques, and the importance of reading manuals. It's not all about the high level stuff - mastering the basics is truly the key to building confident refrigeration techs and stronger, less stressed service teams.

In this episode, we discuss:

(00:48) Refrigeration Basics

(01:26) Compressor Fundamentals

(03:11) Condenser Temps and Subcooling

(04:27) Metering Devices and Superheat

(09:08) Field Basics Gauges Oil and Coils

(11:33) Manuals and System Checks

(13:12) TXV Troubleshooting Steps

Helpful Links & Resources:

Episode 37. Refrigeration Fundamentals and Troubleshooting Training w/ HVAC Know It All

Episode 299. Basic Refrigeration 101

Episode 5. CO2 Refrigeration Fundamentals with James Bailey

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

Join the Refrigeration Mentor Hub here

In this episode, I'm sharing a consistent set of checkpoints during startup and troubleshooting on condensing units and walk-ins. We walk through key measurements from the compressor through the system, including suction pressure/temperature, discharge temperature, volts/amps, oil temperature, condenser inlet/outlet conditions, receiver inlet/outlet checks, liquid line temperature changes, and evaporator outlet pressure/temperature to verify subcooling and superheat. Write these checkpoints down, learn from other techs, and leverage data to spot trends and root causes to speed up service and reduce callbacks.

In this episode, we cover:

(01:23) Refrigeration System Checkpoints Overview

(02:31) Compressor Baseline Checks

(04:42) Condenser Subcooling Checks

(07:32) Receiver and Liquid Line

(08:24) Evaporator Superheat Checks

(09:35) Airflow Defrost and Tools

(10:56) Building Your Troubleshooting Framework

Helpful Links & Resources:

Episode 14. What About Condensers in Refrigeration Applications?

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

VIDEO: CO2 Unfiltered with Sam Major

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This conversation is a detailed walkthrough of supermarket refrigeration installation. We cover phases from pre-construction drawings, bidding, ordering, kickoff meetings, and coordination with other trades, through layout before concrete, trench and overhead piping, hangers, brazing with nitrogen purge, section-by-section pressure testing and documentation, and deep/triple evacuation. We'll also discuss commissioning and startup basics, including verifying sensors/controls, charging strategy, oil system checks, staged circuit startup, and final turnover items.

In this episode, we cover:

(02:48) Why Installation Is Important for Refrigeration Techs to Know

(05:01) Preconstruction Drawings and Planning

(07:34) Ordering Gear and Timelines

(09:16) Kickoff Meetings and Trade Coordination

(10:47) Pipe Routes, Trenches and Hangers

(15:34) Equipment Placement and Roof Curbs

(16:46) Brazing Specs and Rough-In Checks

(24:49) Pressure Testing

(26:49) Drains, Walk-In Boxes and Coil Layout

(30:56) Hanging Evaporator Coils

(32:22) Roof Flashing Tips

(34:34) Pressure Test Evac

(38:32) Controls Wiring Layout

(43:00) Leak Proof Brazing

(46:03) Charging

(47:50) Oil System Startup

(52:57) Final Commission Turnover

Helpful Links & Resources:

Episode 373. Installation Prep for a CO2 Refrigeration System

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

Episode 81. Challenges Faced When Installing CO2 Systems

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

Join the Refrigeration Mentor Hub here

In this conversation, we're discussing how refrigeration techs can make the transition from technician to manager, with Todd Ernest, Executive Chairman of Climate Pros. Todd has some great insights on management skills, including technical excellence versus leadership excellence, emotional intelligence and coaching ability. We also dive into honing communication skils, listening, avoiding favorites, delegating instead of doing, and accountability - the softer skills that are critical for technicians who want to make the career jump into management.

In this episode, we cover:

(05:56) Tech vs Manager Mindset

(08:59) Traits of Successful Leaders

(09:53) Communication Skills

(17:59) New Manager Mistakes

(23:58) Delegation in the Field

(26:04) Accountability Shift

(29:03) Management Reality Checks

(29:53) Crucial Conversations Manager Need to Have

(31:34) Communication That Lands

(33:03) Offering Praise and Listening

(37:22) Coaching and Establishing Control

(39:23) Learning on the Road

Helpful Links & Resources:

Episode 262. Transitioning from Technician to Management

Episode 286. Leadership Training for Technicians with Jim Pape of The Arcticom Group

BOOK: How to Win Friends and Influence People by Dale Carnegie

BOOK: Mindset: The New Psychology of Success by Carol Dweck

Follow Todd on LinkedIn

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

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In this second part of a two-part episode, we're diving deep into oil management for CO2 refrigeration systems with Alessandro Silva, Senior Application Engineer at Bitzer. Here, Alessandro covers oil reservoir sizing, common failures and what to look for during maintenance checks and root-cause troubleshooting to help refrigeration techs perform more efficient service calls and be feel more confident in the field. You can also follow along this webinar on our Refrigeration Mentor YouTube Channel here.

In this episode, we discuss:

(00:58) Flash Gas Bypass Basics

(01:47) Oil Reservoir Sizing

(03:22) Differential Pressure Range

(05:25) Load Changes and Oil Flow

(06:28) Parallel Compression Setup

(10:44) Ejectors and Subcooling Options

(17:41) Low Temp Stage Recovery

(23:05) Compressor Data Benchmarks

(24:15) Compressor Software Diagnostics

(25:45) Low Superheat Fixes

(27:05) Stepper Vs Pulse Valves

(30:50) Oil Separator Maintenance

(33:26) Strainers And Trend Graphs

(35:30) Pipe Sizing For Oil Return

(37:57) CO2 Refrigeration Market Shift

Helpful Links & Resources:

Episode 390. CO2 Oil Management (Part 1): Lubrication Basics, Oil Selection, Testing, and Troubleshooting with Alessandro Silva of Bitzer

Bitzer Fender

Follow Alessandro on LinkedIn

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

Join the Refrigeration Mentor Hub here

In this first part of a two-part episode, we're diving deep into oil management for CO2 refrigeration systems with Alessandro Silva, Senior Application Engineer at Bitzer. Alessandro covers what technicians, designers, and engineers need to know about oil management, including lubrication systems, oil functions, oil protection, as well as proper tools and gauges, oil level management, controls and a ton of troubleshooting tips for service techs to better understand oil management for CO2 systems. You can also follow along this webinar on our Refrigeration Mentor YouTube Channel here.

In this episode, we discuss:

(07:49) Lubrication Systems

(10:10) Oil Functions and Safety Controls

(12:43) Measuring Oil Differential Pressure

(13:21) Tools and Safety for CO2 Service

(18:07) Oil Grades and Application Ranges

(20:22) Oil Circulation Basics

(21:46) Choosing CO2 Compressor Oils

(22:36) Oil Change Intervals

(25:04) Oil Testing Limits

(27:12) Acidity And CO2 Degassing

(32:20) Basic Oil Management Layout

(36:48) Low Pressure Reservoir Setup

(38:41) CO2 Cascade And Pumped Systems

(40:39) Cascade Heat Exchanger Placement

Helpful Links & Resources:

Episode 247. Oil Management with Patrick Gregory

Episode 11. Bitzer CO2 Compressors with Phil Boudreau

Bitzer PV

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

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In this conversation, we're covering the basics of TXV's (thermostatic expansion valves) and superheat with longtime tech, teacher and Refrigeration Mentor Community Ambassador, Andrew Freeburg. We breakdown the purpose of superheat, how to measure it, and variations between different applications and manufacturer specs. We also discuss different supermarket conditions, proper TXV adjustments and service tips every refrigeration technician needs to know to thoroughly understand these important system components.

In this episode, we cover:

(02:08) Superheat Basics Explained

(04:04) Measuring Superheat

(05:25) Target Superheat Ranges

(14:19) When To Adjust TXVs

(17:32) TXV Types And Selection

(19:00) How A TXV Works

(25:44) Bulb Placement

(28:32) Equalizer Line Placement

(29:30) Equalizer Tube Oil Seal Story

(31:10) Bulb Mounting and Insulation

(37:18) Low Temp Startup and Pull Down

(40:35) Cold Capillary Tube Failures

(45:04) Refrigerant Glide and Dew Point

Helpful Links & Resources:

Episode 16. TXV/TEV - A discussion about Thermostatic Expansion Valves

Episode 279. CO2 Experts: Superheat - Controls & Common Issues with Chris Griffiths and John Rothery

Episode 324.  Using AI To Learn and Troubleshoot Refrigeration Systems

Episode 350. Supermarket Refrigeration Tips and Tricks with Robert Ochs