HVAC VRF technician

We are seeking an experienced HVAC / VRF Technician to be responsible for the operation, maintenance, troubleshooting and repair of the hotel’s complete air-conditioning systems.

The ideal candidate must have strong hands-on experience with VRF/VRV systems and should be capable of independently diagnosing electrical, electronic, refrigerant and mechanical faults.

This is not only a preventive-maintenance position. The technician must be able to identify the actual cause of HVAC failures, repair equipment where practical, replace defective components and return systems to normal operation with minimum downtime.

• Operate, inspect, service and maintain hotel VRF/VRV systems.

• Troubleshoot VRF outdoor units, indoor units and complete refrigerant networks.

• Diagnose system error codes using manufacturer service manuals and diagnostic tools.

• Diagnose and repair:

  • PCB/control-board faults

  • Inverter-board faults

  • Compressor faults

  • Fan motors

  • Outdoor fan motors

  • Electronic Expansion Valves (EEVs)

  • Solenoid valves

  • Pressure sensors

  • Temperature sensors / thermistors

  • Communication faults between indoor and outdoor units

  • Power-supply and control-wiring faults

  • Refrigerant-related faults

• Determine whether a component should be repaired or replaced.

• Replace outdoor-unit and indoor-unit components when required.

• Carry out proper VRF commissioning and testing following repairs.

• Identify refrigerant leaks accurately.

• Perform nitrogen pressure testing.

• Perform vacuuming using a proper vacuum pump and micron gauge.

• Charge refrigerant according to manufacturer specifications.

• Recover refrigerant safely when necessary.

• Carry out copper pipe brazing.

• Repair or replace damaged refrigerant piping.

• Understand refrigerant pipe sizing and VRF branch joints.

• Check system operating pressures and temperatures.

• Diagnose undercharge, overcharge, restrictions and refrigerant-flow problems.

The technician must be comfortable using:

• Digital multimeter

• Clamp meter

• Megger / insulation resistance tester

• Temperature probes

• Refrigerant gauges

• Vacuum gauge

• Manufacturer diagnostic equipment

Must be capable of troubleshooting:

• Three-phase and single-phase electrical systems

• Cont actors and relays

• Circuit breakers

• Control transformers

• Sensors

• Communication wiring

• Motors

• Inverter drives

• PCB boards

• Compressor electrical faults

• Earth leakage and insulation faults

The technician should be able to read and understand:

• Electrical wiring diagrams

• HVAC control diagrams

• VRF piping diagrams

• Manufacturer service manuals

Carry out preventive and corrective maintenance for:

• VRF indoor units

• VRF outdoor units

• Ducted split AC units

• Split AC units

• Cassette units

• Fresh Air Units where applicable

• Exhaust and ventilation fans

• Kitchen ventilation systems

• Toilet exhaust systems

• AHUs/FAHUs where installed

Responsibilities include:

• Cleaning filters

• Cleaning evaporator and condenser coils

• Cleaning drain trays and drain lines

• Checking fan motors and bearings

• Checking refrigerant conditions

• Checking electrical connections

• Measuring operating current

• Checking compressors

• Checking temperatures and pressures

• Preventing condensate leakage

• Preventing abnormal noise and vibration

The technician will be expected to respond quickly to guest-room complaints including:

• Room not cooling

• Poor airflow

• AC water leakage

• Excessive noise

• AC turning on/off unexpectedly

• Temperature-control problems

• Thermostat problems

• Unusual smells

• Communication/error codes

Guest-room faults must be diagnosed and repaired with minimum disturbance to hotel guests.

Prepare and follow a preventive-maintenance schedule covering all hotel HVAC equipment.

Maintain records for:

• Equipment model and serial numbers

• Service dates

• Refrige…