Refrigeration Mechanic - Ammonia Chillers

Jobot; Tucson (AZ); On-site; USD 114,000 - 142,000; Full time

Benefits offered by this job

Relocation assistance

Paid training

Job summary

Jobot is seeking a Refrigeration Mechanic to expertly maintain ammonia (R-717) and CO2 (R-744) refrigeration systems in our Tucson, AZ facility. You will lead preventive and corrective maintenance, diagnose issues, and optimize performance, ensuring safety and compliance in a union environment.

Mid-to-senior level technician with 5+ years in industrial refrigeration will thrive here, with opportunities for training, advancement into supervision, and a path toward controls/PMO roles.

Qualifications

• 5+ years’ industrial refrigeration or mechanical experience with ammonia systems.
• CO2 experience highly valued.
• Experience with rotary screw compressor maintenance expected.
• Ammonia Refrigeration I & II and RETA CARO/CIRO certification.
• Knowledge of OSHA PSM, EPA RMP, and IIAR standards.

Responsibilities

• Execute preventive, predictive, and corrective maintenance on ammonia and CO2 systems (compressors, condensers, evaporators, valves, controls).
• Rebuild, align, and troubleshoot rotary screw compressors, addressing seals, bearings, rotors, and oil circuits.
• Perform safe pump-downs, refrigerant charging, leak detection, and LOTO/line-break procedures.
• Analyze system performance data, adjusting parameters for capacity, efficiency, and regulatory compliance.
• Maintain detailed logs and work orders to support PSM/RMP programs and participate in PHAs, MOC, and emergency response.
• Mentor junior technicians and share best practices across the maintenance team.

Skills

Preventive maintenance

Troubleshooting

Rotary screw compressor maintenance

Electrical schematics interpretation

PLC control logic

Education

Ammonia Refrigeration I & II and RETA CARO/CIRO certification

Tools

Mycom

GEA/Grasso

Bitzer

Job description

Refrigeration Mechanic - Ammonia Chillers

$55 - $68 per hour | Tucson, AZ | On-site | Permanent

Relocation assistance available!

A bit about us:

For more than 70 years, we've been the Southwest's go-to partner for complex HVAC and industrial refrigeration projects. With 500+ employees across multiple states, our privately-owned firm combines the resources of a large contractor with the culture of a close-knit team. Continuous training, industry-leading safety programs, and a steady backlog of blue-chip customers mean you'll enjoy both stability and growth. If you thrive on solving challenging mechanical problems in essential facilities, from food processing to cold-storage logistics, this is the place to build a long-term career.

Why join us?

• Union pay scale ($55-$68/hr, overtime opportunities, and best-in-class benefits (medical, dental, vision, pension)
• Stable, long-tenured company with continuous pipeline of industrial projects
• Paid training, factory schools, and tuition reimbursement to advance your craft
• Strong safety record and fully funded PPE program
• Career paths into supervision, controls, and project management

Job Details

Relocation assistance available

You'll be the subject-matter expert for high-horsepower ammonia (R-717) and CO2 (R-744) refrigeration systems that keep mission-critical operations running 24/7. From preventive maintenance and compressor overhauls to PSM documentation and emergency response, you'll own the mechanical integrity of state-of-the-art packages featuring rotary screw compressors, evaporative condensers, and advanced PLC controls. Supported by a safety-first culture and a union workforce, you'll diagnose, repair, and optimize systems to deliver maximum uptime and energy efficiency.

Responsibilities:

• Execute preventive, predictive, and corrective maintenance on ammonia and CO2 systems (compressors, condensers, evaporators, valves, controls).
• Rebuild, align, and troubleshoot rotary screw compressors, addressing seals, bearings, rotors, and oil circuits.
• Perform safe pump-downs, refrigerant charging, leak detection, and LOTO/line-break procedures.
• Analyze system performance data, adjusting parameters for capacity, efficiency, and regulatory compliance.
• Maintain detailed logs and work orders to support PSM/RMP programs and participate in PHAs, MOC, and emergency response.
• Mentor junior technicians and share best practices across the maintenance team.

Qualifications:

• 5+ years’ industrial refrigeration or mechanical experience with ammonia systems; CO2 experience highly valued.
• Proven expertise in rotary screw compressor maintenance (Mycom, GEA/Grasso, Bitzer a plus).
• Ammonia Refrigeration I & II and/or RETA CARO/CIRO certification.
• Working knowledge of OSHA PSM, EPA RMP, and IIAR standards.
• Ability to interpret P&IDs, electrical schematics, and PLC control logic; EPA 608 Universal preferred.

Jobot is an Equal Opportunity Employer. We provide an inclusive work environment that celebrates diversity and all qualified candidates receive consideration for employment without regard to race, color, sex, sexual orientation, gender identity, religion, national origin, age (40 and over), disability, military status, genetic information or any other basis protected by applicable federal, state, or local laws. Jobot also prohibits harassment of applicants or employees based on any of these protected categories. It is Jobot’s policy to comply with all applicable federal, state and local laws respecting consideration of unemployment status in making hiring decisions.

Sometimes Jobot is required to perform background checks with your authorization. Jobot will consider qualified candidates with criminal histories in a manner consistent with any applicable federal, state, or local law regarding criminal backgrounds, including but not limited to the Los Angeles Fair Chance Initiative for Hiring and the San Francisco Fair Chance Ordinance.