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