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