Commissioning Engineer

Garmac Limited LLC; Montgomery (AL); On-site; USD 85,000 - 120,000; Full time

Job summary

Garmac Limited LLC is seeking a Commissioning Engineer with a mechanical/chiller focus to join our on-site team in Montgomery, Alabama. You will support startup, testing, and commissioning of mechanical systems on large-scale data center projects, working with engineering leads and trade partners.

The role requires hands-on experience with chillers, valves, rooftop units, fan arrays, PLC controls, Modbus communications, and point-to-point Level 3 testing, with relocation or travel as needed.

Qualifications

• Mid-level to senior experience in mechanical commissioning, HVAC controls.
• Chiller startup, staging, and troubleshooting depth.
• Experience with PLC troubleshooting and electrical prints (Schneider preferred).

Responsibilities

• Commission and troubleshoot chillers, valve systems, rooftops, and fans.
• Perform Level 3 point-to-point testing and verify hard-wired IO from field devices to control panels.
• Diagnose PLC and Modbus issues; retrieve programs, make supervised edits, and download revised logic.
• Document deficiencies, confirm corrective work, and support safe turnover.
• Coordinate daily with commissioning leads, controls engineers, vendors, and site teams.

Skills

Mechanical commissioning

HVAC controls

PLC troubleshooting

Electrical print-reading

Modbus knowledge

Education

Engineering degree

Tools

Schneider PLC

Rockwell/Allen-Bradley PLC

Siemens PLC

Job description

Commissioning Engineer — Mechanical/Chiller Focus

Location: Montgomery, Alabama

Engagement: W2 long-term contract through with a contract-to-hire path for strong performers

Position Summary

Support startup, testing, and commissioning of mechanical systems on large-scale data center construction projects. Working on site with engineering leads and trade partners, this role troubleshoots chillers, valves, rooftop units, fan arrays, PLC controls, hard-wired inputs and outputs, and Modbus communications through point-to-point Level 3 testing and turnover.

Key Responsibilities

• Commission and troubleshoot chillers, valve systems, rooftop units, fan arrays, and associated controls.
• Perform point-to-point Level 3 testing and verify hard-wired IO from field devices back to control panels.
• Diagnose PLC and Modbus issues; retrieve programs, make supervised edits, and download revised logic.
• Document deficiencies, confirm corrective work, and support safe, standards-based system turnover.
• Coordinate daily with commissioning leads, controls engineers, vendors, and site teams.

Required Qualifications

• Mid-level to senior experience in mechanical commissioning, HVAC controls, industrial controls, or mission-critical facilities.
• Demonstrated chiller startup, staging, and troubleshooting depth.
• Hands-on PLC troubleshooting and electrical print-reading ability; Schneider experience is preferred, while Rockwell/Allen-Bradley or Siemens experience transfers well.
• Experience with hard-wired IO checkout and register-level Modbus troubleshooting.
• HVAC controls technicians with strong chiller depth may qualify alongside degreed engineers.

Work Requirements

This is an on-site role, Monday through Friday, beginning at 7:00 AM, with typical active-site weeks of approximately 45 hours. Candidates must commit to relocation or full-week travel; partial-week, remote, and hybrid arrangements are not available.