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State of Washington Classified Job Specification


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Class Code: 622E
Category: Maintenance Trades & Labor


Performs skilled journey-level work in the installation, maintenance, and repair of refrigeration, air-conditioning, and chilled water equipment, systems, and controls.

Typical Work

Installs, maintains, and repairs refrigerating equipment used in refrigerating plants and air conditioning, ventilation, and water cooling systems;

Overhauls electrical circuits, temperature and pressure controls, and other equipment, using wrenches, testers, and soldering and welding equipment;

Tests coils, valves, and connections to ascertain that system is leak proof and properly adjusted; recharges unit with proper refrigerant when necessary;

Estimates and orders materials and supplies needed to maintain equipment in good working condition;

Supervises and instructs helpers, patients or inmates;

Install, operate, maintain, and repair all types of refrigeration systems, including air-conditioning, chilled water systems, and refrigeration units.

Diagnose, inspect, trouble shoot, and overhaul electrical control circuits, temperature and pressure controls, and all related refrigeration components using manuals, blueprints, and equipment knowledge;

Test coils, valves, and connections to determine that systems are leak proof and properly adjusted;

Operate and maintain cooling towers, including water treatment systems;

Recharge units with proper refrigerant when necessary, and maintain and repair compressor units and departmental research refrigeration equipment;

Test, make measurements, and adjust all types of heating, ventilation, air-conditioning, and refrigeration systems for most efficient performance;

May lead or instruct helpers as required;

May perform work in other trades;

Perform related duties as required.

Knowledge and Abilities

Knowledge of: standard practices, methods, materials, tools, and equipment used in refrigeration work; principles of operation of refrigeration systems; occupational hazards and safety practices of refrigeration trade.

Ability to: diagnose troubles and make necessary adjustments or repairs; estimate time and materials; use hand and power tools; weld and solder.

Legal Requirement(s)

There may be instances where individual positions must have additional licenses or certification. It is the employer’s responsibility to ensure the appropriate licenses/certifications are obtained for each position.

Desirable Qualifications

Journeyman standing as a Refrigeration Mechanic as attested by:

a.         Completion of recognized apprenticeship.


b.         Full journeyman status in Plumbers and Pipefitters' Union.


c.         Five years of experience in State service as full‑time helper to a journeyman Refrigeration Mechanic.

Vocational training may be substituted for work experience on a year-for-year basis. 

Possession of a valid motor vehicle operator's license may be required.

Class Specification History

New class, consolidates 5440 Refrigeration Mechanic, 72240 Refrigerator Mechanic; adopted
May 10, 2007, effective July 1, 2007