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Safety gear (PPE) & essential RAC tools
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Fittings, copper tubes, and components (compressors, filters, condensers, evaporators)
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Brazing techniques & use of gauges and refrigerants
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Cooling cycle and system operations
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Basic electrical knowledge (wires, circuits, ampere, resistance)
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Key components: relay, thermostat, capacitor, overload
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Wiring diagrams for fridge, freezer, water cooler & AC units
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Usage of ammeter, test lamp & AC/DC current understanding