Boiler & Refrigeration Systems Operating Engineer

ATS - Industrial Maintenance
Chicago, IL

Boiler & Refrigeration Systems Operating Engineer

A day in your life here

You arrive on site and make a quick sweep of the powerhouse and utilities rooms—boilers humming, ammonia and Freon chillers on spec, compressed air steady, glycol loops circulating, AHUs balanced, hot oil stable, fire protection and wastewater systems ready. You verify everything is operating safely, then dive into the morning’s preventive maintenance and scheduled inspections.

As the day unfolds, you fine‑tune setpoints and controls through the building automation system (pneumatic and electronic), log spare parts usage, and keep a tight eye on inventory for gaskets, chemicals, pumps, and other critical spares. You document every inspection and immediately escalate any deviation to management. Between calls, you track service requests, close out PMs, and carve out time for training to keep your Stationary Engineer license current and your knowledge sharp on new technologies.

What you’ll do

  • Ensure safe operation of all stationary equipment across boilers, ammonia/Freon chillers, air compressors, glycol and AHU cooling systems, hot oil systems, fire protection, air handling, and wastewater.
  • Complete inspections, document findings, and report any variances to management without delay.
  • Execute preventive maintenance and track/resolve service calls.
  • Adjust system settings and controls for safe, efficient performance.
  • Maintain accurate records of parts and consumables inventories (gaskets, chemicals, pumps, etc.).
  • Pursue ongoing training to maintain required licenses and stay current with evolving technology.

What you bring

  • High school diploma or GED and at least 4 years of related experience.
  • Active Stationary Engineer license with proof of certification.
  • Hands-on experience with building automation systems, including pneumatic and electronic controls.
  • Working knowledge of: Boiler systems; Ammonia and Freon chillers; Air compressors; Glycol and AHU cooling systems; Fire protection systems; Air handling systems; Wastewater systems; Hot oil systems.

Physical demands and work environment

  • Frequent standing, walking, reaching, climbing ladders or lifts, balancing, and work in confined spaces; regular use of hands/fingers; frequent verbal communication and hearing.
  • Occasional sitting; ability to lift and move more than 50 pounds.
  • Regular close and color vision requirements.
  • Occasional exposure to outdoor weather and risk of electrical shock.
  • Factory environment that is typically very loud, with possible exposure to hazardous materials and greasy or slippery floors.

Compensation and benefits

Pay Range (USD): $36.00 – $47.00

ATS believes in fair and equitable pay. Actual salaries may fall within, above, or below this range based on factors such as education, training, experience, professional achievement, business need, and location. We also provide market-leading benefits, including Medical, Dental, and Vision coverage; PTO; a 401(k) retirement plan with employer matching; tuition reimbursement; and more.

Equal Employment Opportunity

ATS is committed to providing equal employment opportunities in all aspects of employment to all applicants and employees without regard to age, color, race, religion, sex (including pregnancy, gender identity, and sexual orientation), national origin, disability, veteran status, genetic information, or other legally protected status.

ATS se compromete a brindar igualdad de oportunidades de empleo en todos los aspectos del empleo a todos los solicitantes y empleados, independientemente de su edad, color, raza, religión, sexo (incluido el embarazo, identidad de género y orientación sexual), origen nacional, discapacidad, estatus de veterano, información genética u otro estatus legalmente protegido.

Posted 2026-02-23

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