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This is the first of a 2-part episode in our "CO2 Unfiltered" series where we're joined by Massimo Pellizzari, Senior Commissioning Engineer at Daikin, for an in-depth look at Daikin's two-stage CO2 condensing units. Massimo explains the design philosophy behind these systems, how they differ from traditional refrigeration equipment and the best practices for installation, commissioning, evacuation, charging and servicing. Whether you're new to CO2 or looking to sharpen your troubleshooting skills, this episode is packed with practical insights to help technicians work more faster and more confidently with CO2 condensing units.

In this episode, we discuss:

(03:10) Why CO2 condensing units are becoming more common worldwide

(05:30) Daikin's two-stage CO2 condensing unit lineup

(07:15) Swing compressor technology and compressor design

(09:45) Oil in CO2 systems

(11:45) Two-stage compression and reducing discharge temperatures

(17:30) Controller features, monitoring and diagnostics

(24:00) Refrigerant charge calculations and piping design software

(33:30) Factory testing, vibration protection and installation considerations

(38:30) Service valves, access points and system maintenance

(49:30) Pressure testing and evacuation procedures

(50:55) Opening EEVs and solenoid valves during evacuation

(51:00) Refrigeration-grade CO2 and refrigerant purity

(53:10) Proper CO2 charging procedures and overcoming the triple point

(57:30) Service ports, valve design and final technician tips

Helpful Links & Resources:

Massimo in LinkedIn

Daikin

Episode 414. Breaking the Stigma and Learning to Love CO2

Episode 180: Developing your CO2 Knowledge into Experience

Episode 146: CO2 Technical Training with Brett Wetzel