Industrial Chiller Mechanic-Ammonia/CO2

Jobot; Tucson (AZ); On-site; USD 76,000 - 96,000; Full time

Benefits offered by this job

Union benefits

Great culture

Competitive pay

Relocation assistance

Job summary

Jobot is seeking an Industrial Refrigeration/Chiller Mechanic in Tucson, AZ to install, maintain, troubleshoot, and repair ammonia (R-717) and CO2 (R-744) refrigeration systems. The ideal candidate has hands-on experience with screw compressors and a strong commitment to safety and regulatory compliance.

We offer union benefits, relocation assistance, and a competitive base pay. On-site, permanent role with after-hours on-call rotation and mentorship to junior technicians.

Qualifications

• 5+ years of hands-on experience in industrial refrigeration.
• Proven ammonia (R-717) refrigeration expertise.
• Experience with chillers and CO2 (R-744) systems.
• Strong screw compressor maintenance and troubleshooting skills.
• RETA certification and OSHA PSM knowledge.
• Valid driver's license.

Responsibilities

• Perform preventive, predictive, and corrective maintenance on ammonia/CO2 systems.
• Service and troubleshoot rotary screw compressors and related components.
• Diagnose system performance and optimize efficiency.
• Follow lockout/tagout and line-break procedures for safety.
• Maintain logs and documentation for PSM/RMP compliance.
• Read P&IDs and electrical schematics; monitor PLC-based controls.
• Respond to after-hours calls and support on-call rotations.
• Mentor junior technicians.

Skills

Ammonia refrigeration

CO2 refrigeration

Rotary screw compressors

RETA certification

PSM compliance

Tools

Mycom

GEA

Bitzer

Job description

Industrial Chiller Mechanic-Ammonia/CO2

$55 - $70 per hour | Tucson, AZ | On-site | Permanent

A bit about us:

We are a mechanical contractor looking for an Industrial Refrigeration/Chiller Ammonia Technician in Tucson.

Why join us?

• Union Benefits
• Great Culture
• Competitive base pay
• Relocation assistance!

Job Details

We are looking for an Industrial Refrigeration/Chiller Mechanic to install, maintain, troubleshoot, and repair industrial ammonia (R-717) and CO₂ (R-744) refrigeration systems. The ideal candidate is a well-rounded industrial mechanic with deep hands‑on experience with screw compressors and a strong commitment to safety, reliability, and regulatory compliance.

Key Responsibilities

• Perform preventive, predictive, and corrective maintenance on industrial ammonia and CO₂ refrigeration systems, including compressors, condensers, evaporators, vessels, pumps, valves, and controls.
• Service, overhaul, align, and troubleshoot rotary screw compressors, including mechanical seals, bearings, rotors, slide valves, and oil systems.
• Diagnose system performance issues and make adjustments to optimize efficiency, capacity, and energy use.
• Safely perform pump‑downs, oil draining, refrigerant charging, leak detection, and equipment isolation following lockout/tagout and line‑break procedures.
• Maintain accurate maintenance logs, work orders, and system documentation in support of PSM and RMP compliance programs.
• Participate in Process Hazard Analyses (PHAs), Management of Change (MOC), Mechanical Integrity Inspections, and emergency response activities as required.
• Read and interpret P&IDs, mechanical drawings, electrical schematics, and manufacturer manuals.
• Work with PLC/microprocessor‑based compressor control panels to monitor, troubleshoot, and adjust operating parameters.
• Respond to after‑hours emergency calls and participate in an on‑call rotation as needed.
• Mentor and support less experienced technicians and operators.

Required Qualifications

• 5+ years of hands‑on experience as an industrial mechanic or industrial refrigeration technician in industrial refrigeration environments.
• Proven experience with ammonia (R-717) refrigeration systems.
• Experience with chillers, CO₂ (R-744) refrigeration systems (transcritical, subcritical, or cascade).
• Strong hands‑on experience with rotary screw compressor maintenance, rebuilds, and troubleshooting.
• Ammonia Refrigeration I & II training and/or RETA certification (CARO or CIRO).
• Working knowledge of OSHA PSM (29 CFR 1910.119), EPA RMP, and IIAR standards.
• Strong mechanical aptitude with the ability to use precision measuring tools, alignment equipment, and diagnostic instruments.
• Ability to work safely at heights, in confined spaces, and in cold or hot environments while wearing required PPE, including respirators.
• Valid driver's license

Preferred Qualifications

• Experience with Mycom, GEA (Grasso), and/or Bitzer compressors.
• Familiarity with other major equipment manufacturers (GEA, Tempest, Evapco, BAC).
• Experience with refrigeration control systems (GEA, Mycom, Tempest).
• EPA 608 Universal certification.
• Industrial electrical troubleshooting experience (motors, VFDs, starters).
• Experience in cold storage, or other industrial facilities.

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.

Information collected and processed as part of your Jobot candidate profile, and any job applications, resumes, or other information you choose to submit is subject to Jobot's Privacy Policy, as well as the Jobot California Worker Privacy Notice and Jobot Notice Regarding Automated Employment Decision Tools which are available at jobot.com/legal.

By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Jobot, and/or its agents and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy here: jobot.com/privacy-policy