HVAC Technician (Cold Room)

Job Scope (Primary Responsibility) Main focus: Walk-in cold rooms / Freezers Blast freezer systems (defrost-critical) Chiller systems / cooling tunnels Ice room & process cooling Secondary: Aircon systems (including Mitsubishi - basic to intermediate) Critical Skills ( MANDATORY ) 1. Strong Refrigeration Troubleshooting (core requirement) Candidate must be able to independently diagnose and fix: System not reaching temperature Intermittent cooling / unstable temperature Ice buildup / defrost failure High / Low pressure issues Refrigerant-related faults Must be able to understand: Refrigeration cycle (practical, not theory only) Superheat / basic charging logic System behavior under load Practical: Brazing & piping repair Leak detection tools Can work at height (no height phobia) 2. Compressor & System Fault Diagnosis Hands-on experience with: Reciprocating compressors Multi-stage / low-temp systems Must be able to troubleshoot: Compressor not starting Frequent tripping (HP/LP/overload) Abnormal noise / overheating Oil-related issues 3. Electrical & Control Troubleshooting (VERY IMPORTANT) Must be able to: Read basic wiring diagrams Diagnose - Contractor/Relay faults, Power supply issues, Sensor faults Use multimeter confidently - Voltage, Continuity, Basic fault tracing 4. Controller Handling (e.g. Eliwell / Dixell) Must be comfortable with controllers: Required ability: Adjust setpoints Check alarms Identify fault conditions Trigger manual defrost - UP key ≥ 5 sec Practical understanding: Controller affects - Compressor, Defrost, Fans Required : Confident operations + troubleshooting logic Not required: deep programming 5. Defrost System Understanding (IMPORTANT) Must understand and troubleshoot: Hot gas defrost Electric heater defrost Example system: Timed defrost cycles (e.g. every 4hrs, ~ 23mins) Must be able to identify: Heater failure Valve not switching Defrost not terminating Job Requirement: Minimum 3-5 years hands-on HVAC / Refrigeration Minimum GCE 'O' Level Cold room or industrial refrigeration experience is a MUST Hardworking & Independent A team player Must be able to work on Weekends/Public Holidays *Please DO NOT apply for this role if you only have residential aircon technician experience