Education: Secondary (high) school graduation certificate. Tasks: Install refrigeration systems. Install ventilation, air handling and air conditioning systems. Measure and lay out reference points for installation. Read blueprints or other instructions to determine work requirements. Assemble and install refrigeration or air conditioning components. Measure, cut and connect piping using welding and brazing equipment. Work conditions and physical capabilities: Attention to detail. Personal suitability: Client focus. Initiative. Judgement. Experience: 7 months to less than 1 year.