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This episode of our CO2 Experts Live series features Kevin Mullis, Technical Manager at Integral UK, talking about case controllers for CO2 refrigeration systems. Kevin has a ton of experience helping technicians solve CO2 system problems and here covers troubleshooting steps, how to identify common issues and how to verify the functionality of components like transducers and stepper valves. Kevin shares a ton of great tips to help refrigeration technicians diagnose case controller problems faster and more efficiently. 

In this conversation, we cover:

-CO2 case controllers

-Understanding the Danfoss AK 550A & Carel MPXPRO controllers

-Key roubleshooting tips for controllers

-Electrical wiring and probes

-Voltage and relay checks

-Transducer testing and network fault finding

-Adaptive superheat 

-Stepper valves

-Importance of fault codes in troubleshooting

-Floating suction and system efficiency

Helpful Links & Resources:

Episode 246. CO2 Experts: Startup and Commissioning with Kevin Mullis

Episode 227. Getting to Know Transcritical CO2 Supermarket Refrigeration Systems with Kevin Mullis

Danfoss KoolCode app

Kevin Mullis on LinkedIn

Website: Integral UK Ltd.

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