Competition Brief

The competition involves 2 tasks;
A Refrigeration system electrical fault find and component replacement 2.5 hours
B Pipe work fabrication 2 hours


A. Refrigeration system electrical fault find and component replacement

Competitors are allocated a prefabricated refrigeration system charged with R134a ‘work station’ and will have to perform the following:

  • Safe isolation
  • Recover refrigerant and complete records
  • Break into system and replace component.
  • Pressure test and complete records
  • Evacuate and complete records
  • Add refrigerant and complete records
  • Use electrical meter to investigate / diagnose a simple electrical wiring fault and complete records
  • Reinstate wiring according to wiring diagram
  • Check voltage and current.
  • Check superheat and subcooling and set point.

B. Refrigeration pipe work fabrication

  1. Competitors are to fabricate and flame braze copper pipe work according to a diagram
    Safe Working Candidates must follow the control measures noted in the risk assessment and work safely at all times.

Skills & Knowledge to be demonstrated:

  • Interpreting detailed drawings including location dimensions
  • Measuring, fitting and use of materials in an efficient way
  • Installation of components using general hand tools
  • Copper Pipe bending
  • Flame brazing similar and dissimilar materials using a range of gases
  • Installation of non permanent mechanical copper pipe joints (flare)
  • Use of weigh scales
  • Recovery of refrigerant
  • Legislative record completion
  • Pressure testing & evacuation testing
  • Charging and recovery of refrigerants according to Fgas category 1 procedures
  • Use of electrical testing equipment
  • Reading wiring diagrams to fault find control circuits
  • Connection of wiring conductors to components

Standards

  • Measurements should be within +/- 2mm of the specification
  • All components to be positioned and laid out according to diagram
  • Fgas regulations / BSEN378:2016
  • Wiring terminations to be tight and without conductors showing when viewed at 90º
  • All components to be earthed
  • Electrical instruments used to test & prove the control circuit is safe to energise (judge to sign off) o Earth continuity, Polarity ‘dead’
  • Superheat between 5 &10K • Subcooling between 3 & 5K
  • Adherence to risk assessment and safe work practice at all times

The competition judges will mark the work of each competitor according to a detailed mark scheme. The summary marking scheme is provided below.

WeightingAspectCriteriaMaximum mark
2AREFRIGERANT RECOVERY16
6BPIPE WORK FABRICATION22
5CELECTRICAL WIRING & CONTROL FAULT FINDING12
1DPRESSURE TESTING & EVACUATION14
3EREFRIGERANT ADDITION16
4FREFRIGERATION SYSTEM COMMISSIONING20
Total Marks100