Service Technician, VRF

The AAON & LG HVAC Service Technician is responsible for the installation, support, start-up, commissioning, troubleshooting, maintenance, and repair of commercial HVAC equipment, with a primary focus on AAON and LG equipment. The technician will work directly with customers, service management, controls personnel, contractors, and manufacturers to diagnose and resolve mechanical and controls-related issues.

The ideal candidate will have strong commercial HVAC experience, excellent troubleshooting skills, and the ability to work independently while maintaining a high level of customer service and professionalism.

**Key Responsibilities

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**Service & Troubleshooting

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• Diagnose and repair commercial HVAC equipment, including:

  • AAON packaged rooftop units

  • AAON air-handling equipment

  • LG VRF systems

  • LG heat-pump and heat-recovery systems

  • DX and refrigeration systems

  • Hydronic heating and cooling systems

  • VFDs, motors, compressors, fans, and associated components

• Troubleshoot electrical, mechanical, refrigeration, and controls issues.

• Identify root causes rather than simply correcting symptoms.

• Perform system testing and verify proper operation after repairs.

**Start-Up & Commissioning

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• Perform factory start-up and commissioning of AAON and LG equipment.

• Verify refrigerant charge, airflow, temperatures, pressures, electrical characteristics, safeties, and operating sequences.

• Complete manufacturer start-up documentation.

• Coordinate with controls technicians during BMS integration and functional testing.

• Assist with commissioning and troubleshooting of equipment connected to building automation systems.

**Preventive Maintenance

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• Perform scheduled preventive maintenance on commercial HVAC equipment.

• Inspect coils, filters, belts, bearings, motors, compressors, electrical components, dampers, economizers, and refrigeration systems.

• Identify developing equipment problems and recommend corrective action.

• Provide customers with repair recommendations and equipment condition reports.

**Customer Service

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• Communicate professionally with customers, facility managers, contractors, and other trades.

• Explain equipment problems and recommended repairs in a clear, understandable manner.

• Maintain a professional appearance and attitude while representing DMG.

• Respond to emergency and after-hours service calls as required.

**Documentation

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• Complete accurate field service reports for every service visit.

• Document equipment condition, troubleshooting performed, readings, repairs, and recommendations.

• Include photographs, equipment information, and part numbers when appropriate.

• Maintain accurate labor, travel, and material records.

• Identify potential repair and replacement opportunities for the Service & Controls sales team.

**Required Qualifications

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• 3+ years of commercial HVAC service experience preferred.

• Strong knowledge of commercial HVAC systems.

• Ability to read electrical schematics and wiring diagrams.

• Strong mechanical and electrical troubleshooting skills.

• Knowledge of refrigeration fundamentals.

• Ability to use electrical and HVAC diagnostic instruments.

• Valid driver's license and acceptable driving record.

• Ability to work independently and manage multiple service calls.

• Strong written and verbal communication skills.

• Ability to work safely in commercial and industrial environments.

**Preferred Qualifications

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• Experience servicing AAON equipment.

• Experience servicing LG VRF systems.

• AAON factory training or certification.

• LG VRF training or certification.

• Experience with equipment start-up and commissioning.

**Physical Requirements

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• Ability to lift and carry HVAC tools and components.

• Ability to climb ladders and access rooftops.

• Ability to work in confined spaces and mechanical rooms.

• Ability to work outdoors in varying weather conditions.