HVAC TECHNICIAN (COLD ROOM)

Roles & Responsibilities

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

Tell employers what skills you have

Troubleshooting
COLD
Critical Thinking
Chillers
HVAC
Electrical
Cooling Towers
Industrial Refrigeration
Perform Work At Height
Team Player
Compressors
Power Supply System
Initiative
hardworking
Able To Work Independently