Senior CO₂ Refrigeration & Commissioning Technician

AJ Personnel; Gauteng; On-site; ZAR 450,000 - 750,000; Full time

Job summary

AJ Personnel is seeking a qualified Refrigeration Mechanic (Red Seal) to lead commissioning and service of commercial and industrial refrigeration systems in South Africa. The role emphasizes CO2 (R744) trans-critical installations and high‑reliability cooling equipment across racks, cold rooms, chillers and process cooling systems.

You will interpret P&IDs and electrical drawings, configure controllers (Carel, Danfoss, Dixell, Eliwell) and VSDs, perform FAT/SAT, diagnose faults, and manage

Qualifications

• Matric and trade ticket required for refrigeration technician role.
• Qualified Refrigeration Mechanic with Red Seal is mandatory.
• SAQCC gas registration must be valid.
• Code B driver’s license required.

Responsibilities

• Assist Contractors with commissioning and servicing commercial and industrial refrigeration systems.
• Commission CO2 (R744) trans-critical systems.
• Commission refrigeration racks, cold rooms, freezers, chillers and process cooling systems.
• Carry out preventative maintenance according to service schedules.
• Attend emergency breakdowns and reactive service calls.
• Diagnose and repair refrigeration, mechanical and electrical faults.
• Replace compressors, evaporators, condensers, valves and related components.
• Perform leak testing, evacuation, refrigerant charging and recovery.
• Complete FAT, SAT, commissioning and customer handovers.
• Assist OEM representatives during commissioning and warranty start-ups.
• Configure refrigeration control systems and parameters.
• Read electrical schematics, P&IDs and refrigeration diagrams.
• Test electrical circuits, motors, contactors and safety devices.
• Monitor refrigeration systems via remote platforms.
• Ensure OHSA compliance.

Skills

Electrical fault-finding

Mechanical fault-finding

CO2 refrigeration systems

Commissioning controllers & VSDs

Reading P&IDs & electrical drawings

Microsoft Office

Education

Grade 12 (Matric)

Red Seal Refrigeration Mechanic (Trade Test)

SAQCC Gas Registration

Code B driver's license

Tools

Carel controllers

Danfoss controllers

Dixell controllers

Electronic expansion valves (EEVs)

Leak detection & nitrogen testing

Job description

AJ Personnel is seeking a qualified Refrigeration Mechanic (Red Seal) to lead commissioning and service of commercial and industrial refrigeration systems in South Africa. The role emphasizes CO2 (R744) trans-critical installations and high‑reliability cooling equipment across racks, cold rooms, chillers and process cooling systems.

You will interpret P&IDs and electrical drawings, configure controllers (Carel, Danfoss, Dixell, Eliwell) and VSDs, perform FAT/SAT, diagnose faults, and manage