Commercial HVAC VRF Commissioning Specialist — AAON & LG Systems

Picture your day: You review the morning dispatch, load your gauges and meters, and head to a downtown rooftop where an AAON packaged unit is ready for start-up. You verify airflow, confirm refrigerant charge, check safeties, and document electrical characteristics. By midday, you’re indoors commissioning an LG VRF heat-recovery system, walking a facility manager through operating sequences and confirming BMS integration with a controls technician. In the afternoon, you’re troubleshooting a hydronic loop, tracking down a VFD fault to a failing fan motor—and you close the loop with a clear service report, photos, part numbers, and recommendations. That’s a typical day for our AAON & LG HVAC Service Technician at DMG.

What You’ll Own

• Installation, support, start-up, commissioning, maintenance, and repair of commercial HVAC equipment with a primary focus on AAON and LG platforms.
• Service & troubleshooting across electrical, mechanical, refrigeration, and controls domains—finding root causes, not just symptoms.
• Hands-on work on 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, and VFDs, motors, compressors, and fans.
• System testing and operational verification after repairs or adjustments.

Start-Up & Commissioning Excellence

• Execute factory start-ups for AAON and LG equipment; complete all manufacturer documentation accurately.
• Verify refrigerant charge, airflow, temperatures, pressures, electrical characteristics, safety circuits, and operating sequences.
• Coordinate with controls personnel for BMS/Building Automation System integration and functional testing; assist with troubleshooting of BAS-connected equipment.

Preventive Maintenance That Prevents

• Perform scheduled PM on coils, filters, belts, bearings, motors, compressors, electrical components, dampers, economizers, and refrigeration circuits.
• Identify developing issues early and recommend corrective actions.
• Provide customers with clear condition reports and prioritized repair options.

Customer Partnership

• Collaborate daily with customers, service management, controls specialists, contractors, and manufacturers.
• Explain findings and fixes in plain language; represent DMG with a professional attitude and appearance.
• Respond to emergency and after-hours calls as needed.

Documentation That Tells the Story

• Deliver accurate field service reports for every visit.
• Record conditions, diagnostics, readings, repairs, and recommendations—include photos, equipment details, and part numbers when useful.
• Track labor, travel, and materials precisely.
• Flag repair/replacement opportunities for the Service & Controls sales team.

What You Bring

• 3+ years of commercial HVAC service experience (preferred).
• Deep understanding of commercial HVAC systems and refrigeration fundamentals.
• Fluency in reading electrical schematics and wiring diagrams.
• Proven mechanical and electrical troubleshooting capability; adept with diagnostic instruments.
• Valid driver’s license with an acceptable driving record.
• Independent, organized, and able to manage multiple service calls with strong written and verbal communication.
• Commitment to working safely in commercial and industrial environments.

Bonus Points

• Experience servicing AAON equipment and LG VRF systems.
• AAON factory training/certification and LG VRF training/certification.
• Hands-on background in equipment start-up and commissioning.

Physical Realities

• Lift and carry HVAC tools and components as needed.
• Climb ladders and access rooftops safely.
• Work in confined spaces and mechanical rooms.
• Operate outdoors across varying weather conditions.

If you thrive on complex diagnostics, precise commissioning, and clear communication, you’ll feel right at home here.