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20 INSTRUMENTS · AS/NZS · kPa & psi
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Daily six
Superheat & Subcoolingcharge check PT Chartrefrigerant data Airflow / Delta-T Checkair side Start & Run Diagnosticselectrical Heat Loadcooling load Coolroom & Freezer Heat Loadrefrigeration load
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01AC Not CoolingAirflow check, then charge check — the right tools in the right order.02Coolroom / Fridge Not Holding TempDefrost, coils, charge or compressor — refrigeration-first diagnostic order.03Compressor Won’t StartElectrical-first no-start procedure: capacitors, amps, imbalance.04Refrigeration Control Fault-FindingPressure controls, stats, klixons, defrost circuits and the safety chain.05HVAC Control Fault-FindingPCB systems — fault codes, thermistors, relays, comms and inverter boards.06AC Heat Load & SizingMeasure, calculate and hand off a defensible capacity figure.07Coolroom / Freezer SizingSize refrigeration plant and verify existing plant against load.
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