HVAC Mechanic III

Arlington Public Schools•Arlington, VA

16h•Onsite

About The Position

Human Resources announces an opening for a 1.0 FTE position as HVAC Mechanic III with the Facilities and Operations Division, School Support. This is a twelve-month, Grade M-16 position GENERAL STATEMENT OF DUTIES The HVAC Mechanic III serves as an advanced-level technician whose work is performed to ensure the safe, reliable, and efficient operation of complex heating, ventilation, air conditioning, and refrigeration (HVAC-R) systems across multiple APS facilities, with the purpose of diagnosing problems, determining corrective actions, and implementing solutions that directly affect building comfort, system performance, and overall operational continuity. The position installs, operates, adjusts, maintains, troubleshoots, repairs, replaces, and modifies a full range of commercial-industrial and residential HVAC-R equipment—including chillers, boilers, cooling towers, air handlers with variable frequency drives, refrigeration systems, and digital/pneumatic controls—while applying advanced trade knowledge, specialized diagnostic software, and Energy Management System (EMS/BAS) programming to achieve accurate and effective system outcomes. The work has significant impact on students, staff, and facility operations by ensuring indoor environmental quality, system safety, and energy efficiency, and it supports long-term asset preservation and sustainability goals. The employees’ recommendations concerning preventive and predictive maintenance, system optimization, and technological improvements influence operational practices and resource utilization, and the mechanic may also provide technical guidance and on-the-job training to lower-level personnel. SUPERVISION The HVAC Mechanic III reports to the HVAC Maintenance Supervisor or, in the supervisor’s absence, to the HVAC Maintenance Assistant Supervisor, and receives work through established workflows such as work orders, trouble calls, and scheduled maintenance assignments that typically outline objectives, priorities, timelines, available resources, known or anticipated issues, and any specific parameters requiring consideration. While assignments may define expected outcomes, the employee is responsible for planning, laying out, and completing tasks independently, using advanced mechanical knowledge, specialized diagnostic tools, and accepted trade practices to determine appropriate methods and make informed decisions. The mechanic is expected to exercise considerable judgment in diagnosing problems, selecting procedures, making recommendations within assigned authority, and resolving issues not explicitly covered by standard guidelines, referring highly complex or unusual circumstances to the supervisor for direction. Work is reviewed through periodic checks, technical evaluation of completed repairs, system performance following service, customer and stakeholder feedback, and assessment of overall quality, timeliness, and compliance with safety and regulatory requirements. Although the role may provide technical guidance to others, the HVAC Mechanic III has no formal supervisory responsibility over employees or students. DISTINGUISHING CHARACTERISTICS This advanced-level, multi-position class within the Department of Facilities and Operations is distinguished by responsibility for performing the full range of HVAC mechanic functions at a highly technical and independent level, requiring the employee to evaluate complex building conditions, system performance data, and diverse operational needs before determining the proper course of action. Assignments typically involve commercial-industrial HVAC tasks that demand analysis of variable factors—such as system age, load demands, BAS/EMS trends, environmental conditions, and equipment interactions—requiring the employee to interpret incomplete or conflicting information, diagnose underlying issues, and apply advanced trade principles to develop sound solutions. The work requires originality and judgment in refining methods, adapting techniques, and at times devising new approaches to resolve atypical or multifaceted problems across multiple sites. As an in-house technical expert, the HVAC Mechanic III independently resolves sophisticated mechanical and controls issues, supports districtwide energy-efficiency and sustainability initiatives, and provides specialized guidance, training, and task leadership to lower-level mechanics, even though the position does not serve in a formal supervisory capacity. GUIDELINES The HVAC Mechanic III uses a wide range of guidelines that include federal, state, and county regulations governing HVAC materials handling, environmental protection, workplace safety, and building code compliance; industry standards and technical principles related to commercial, industrial, and residential HVAC systems; manufacturer specifications and technical manuals for installing, maintaining, and repairing diverse equipment; APS preventive maintenance schedules; Arlington School Board policies and related implementation procedures; departmental operating procedures such as work order processes and standard operating procedures; and general references such as maps and basic operational rules for district vehicle use. While these guidelines provide essential direction, they vary in specificity, and many situations require the employee to interpret, adapt, or integrate multiple sources of guidance to address complex system issues or atypical conditions. The HVAC Mechanic III exercises considerable judgment in selecting the appropriate guidelines, determining how to apply them to evolving technologies and diverse building conditions, and adapting them when direct instructions are unavailable—particularly when recommending improvements to preventive or predictive maintenance, incorporating new HVAC technologies, or addressing customer concerns. The nature of the work often requires balancing regulatory requirements, technical standards, operational priorities, and practical field conditions, making interpretation and informed decision-making a central component of this factor. CONTACTS The HVAC Mechanic III has regular contact with a wide range of individuals, including coworkers within Maintenance Services, principals, building managers, instructional staff, and other APS employees, as well as vendors, manufacturers, suppliers, contractors, and, on occasion, Arlington County personnel regarding code-related issues. These contacts provide information, context, technical support, and collaboration needed to carry out both routine and complex HVAC assignments. The employee must use judgment in determining how to interact with each party, selecting the appropriate level of technical detail, customer service approach, and problem-solving strategy based on the nature of the work being performed. Some contacts require straightforward information exchange, while others involve interpreting technical issues, coordinating multi-step repairs, or providing guidance and instruction to lower-grade HVAC Mechanics. The variety of individuals and purposes involved—ranging from resolving system failures to discussing preventive maintenance needs or clarifying code requirements—requires the employee to adapt communication style, apply diplomacy, and exercise discretion to ensure accurate information sharing, effective collaboration, and positive relationships with school-based staff and external partners. ESSENTIAL FUNCTIONS Install, operate, adjust, maintain, troubleshoot, repair, replace, and modify the full range of HVAC-R systems, including air handlers, variable frequency drives (VFDs), chillers, boilers, cooling towers, pumps, motors, compressors, duct systems, and direct expansion and hydronic systems. Diagnose and resolve complex mechanical, electrical, pneumatic, and digital control issues using advanced tools, schematics, and specialized diagnostic software. Maintain and repair commercial-industrial refrigeration systems (walk-ins, reach-ins, freezers, domestic refrigerators, and ice machines), including refrigerant recovery, leak detection, charging, and documentation in accordance with EPA requirements. Conduct system testing and tuning such as valve rebuilding, airflow measurement, duct leakage testing, balancing, and heat load/loss calculations to ensure peak system performance. Adjust and reprogram Building Automation Systems/Energy Management Systems (BAS/EMS)—including BAS platforms such as BACnet, Trane, Siemens, or Johnson Controls—to ensure comfort, efficiency, and proper system operation. Maintain ventilation and exhaust systems, including make-up air units, shop and kitchen ventilation, heaters, and restroom/building exhaust systems. Perform routine technical tasks such as calibrating sensors and controls, replacing belts, lubricating parts, cleaning coils, threading/cutting pipe, installing ductwork and diffusers, and replacing switches, solenoids, timers, and other control components. Use and maintain a wide range of trade tools, including multimeters, airflow meters, temperature/humidity instruments, manifold gauges, threaders, cutting torches, and digital diagnostic equipment. Perform scheduled preventive maintenance following APS procedures, industry standards, and manufacturer specifications for all HVAC-R systems. Evaluate equipment condition and system performance to recommend upgrades, replacements, or modifications based on observed wear, technological changes, and lifecycle considerations. Support development of predictive maintenance practices by using BAS data, performance trends, and sensor diagnostics to identify emerging issues. Monitor buildings for signs of deferred maintenance or declining system performance and report findings with or without recommendations. Use computerized maintenance management systems (CMMS) to review assignments, record work performed, log materials and refrigerant use, and close work orders. Operate digital tools, mobile applications, and telecom devices for communication, scheduling, troubleshooting, and accessing technical information. Maintain required records such as MSDS logs, compliance documentation, material use reports, and technical service notes. Provide courteous, proactive, and responsive support to principals, building managers, staff, and other APS personnel regarding HVAC concerns. Investigate comfort complaints, evaluate system performance, determine root causes, and resolve issues—including making fine-tuned adjustments to satisfy comfort needs when systems are sized and balanced appropriately. Coordinate work with contractors, vendors, inspectors, and County officials for inspections, code compliance, and specialized support. Provide on-the-job training and task guidance to HVAC I/II staff, student workers, and special program personnel to support skill development and safe work practices. Offer technical direction in areas of expertise, including complex diagnostics, BAS/EMS controls, or advanced repair procedures; may assume temporary work leadership in the absence of the Lead HVAC Mechanic. Review routine maintenance work performed by lower-level staff and provide immediate corrective instruction when required. Follow all applicable OSHA/VOSHA regulations, APS safety procedures, and county building and fire codes, ensuring the safe handling of refrigerants and hazardous materials. Use appropriate PPE, follow lockout/tagout procedures, and maintain safe work practices while working around energized equipment, chemicals, confined spaces, and elevated locations. Identify and report safety risks, ensure safe conditions at worksites, and respond to emergencies to restore HVAC service when necessary. Prepare assignments by reviewing work orders, schedules, and system information; requisition parts and materials and maintain stock on the service vehicle. Maintain regular communication with the supervisor and customers via radio, phone, or digital platforms, keeping all parties informed of progress and issues. Drive to multiple APS sites, perform basic vehicle upkeep, and support districtwide operations requiring multi-site service. Set up and cleanup worksites, maintain shop areas, and perform other trade-related tasks as assigned. REQUIRED KNOWLEDGE, SKILLS, AND ABILITIES Advanced knowledge of HVAC-R theory, diagnostics, installation, troubleshooting, repair, and modification for commercial, industrial, and residential systems, including chillers, boilers, refrigeration equipment, hydronic systems, ventilation systems, and VFDs. Strong knowledge of BAS/EMS platforms, including DDC controls, BAS networking (e.g., BACnet), and energy-management strategies. Knowledge of safety regulations and building codes, including EPA refrigerant rules, OSHA/VOSHA standards, and APS policies and procedures. Understanding of trade standards, manufacturer specifications, and evolving HVAC technologies and materials. Skilled in analyzing system performance, interpreting technical data, and resolving complex HVAC problems efficiently. Proficient in reading and interpreting schematics, blueprints, diagrams, and technical manuals. Skilled in the use of HVAC trade tools, diagnostic instruments, and relevant software, including CMMS platforms and BAS diagnostic tools. Strong written and verbal communication skills, with the ability to provide clear information to staff, contractors, and customers. Ability to work independently across multiple sites, setting priorities and making informed decisions within established guidelines. Ability to adapt guidelines and apply judgment when addressing non-routine or complex system issues. Ability to learn new technologies and equipment quickly as systems evolve. Ability to provide on-the-job training and technical guidance to lower-level HVAC personnel. Ability to work safely, identify hazards, follow safety procedures, and handle refrigerants and hazardous materials properly. Commitment to sustainable practices and energy-efficient HVAC operations.

Requirements

Advanced knowledge of HVAC-R theory, diagnostics, installation, troubleshooting, repair, and modification for commercial, industrial, and residential systems, including chillers, boilers, refrigeration equipment, hydronic systems, ventilation systems, and VFDs.
Strong knowledge of BAS/EMS platforms, including DDC controls, BAS networking (e.g., BACnet), and energy-management strategies.
Knowledge of safety regulations and building codes, including EPA refrigerant rules, OSHA/VOSHA standards, and APS policies and procedures.
Understanding of trade standards, manufacturer specifications, and evolving HVAC technologies and materials.
Skilled in analyzing system performance, interpreting technical data, and resolving complex HVAC problems efficiently.
Proficient in reading and interpreting schematics, blueprints, diagrams, and technical manuals.
Skilled in the use of HVAC trade tools, diagnostic instruments, and relevant software, including CMMS platforms and BAS diagnostic tools.
Strong written and verbal communication skills, with the ability to provide clear information to staff, contractors, and customers.
Ability to work independently across multiple sites, setting priorities and making informed decisions within established guidelines.
Ability to adapt guidelines and apply judgment when addressing non-routine or complex system issues.
Ability to learn new technologies and equipment quickly as systems evolve.
Ability to provide on-the-job training and technical guidance to lower-level HVAC personnel.
Ability to work safely, identify hazards, follow safety procedures, and handle refrigerants and hazardous materials properly.
Commitment to sustainable practices and energy-efficient HVAC operations.
High school diploma or GED required.
A minimum of seven (7) years of progressively responsible experience in commercial, industrial, and residential HVAC-R systems is required.
A minimum of two (2) years as a journey-level HVAC mechanic, or (1) year at a senior-level (above journey-level) with commercial/industrial refrigeration experience required.
CFC-Universal certification or EPA Section 608 Universal Certification is required.
A State driver's license is required.

Nice To Haves

A Master License in HVAC or Certification in BAS/EMS platforms or advanced HVAC technologies (preferred; examples: NIACC, Tridium/Niagara) is preferred.

Responsibilities

Install, operate, adjust, maintain, troubleshoot, repair, replace, and modify the full range of HVAC-R systems, including air handlers, variable frequency drives (VFDs), chillers, boilers, cooling towers, pumps, motors, compressors, duct systems, and direct expansion and hydronic systems.
Diagnose and resolve complex mechanical, electrical, pneumatic, and digital control issues using advanced tools, schematics, and specialized diagnostic software.
Maintain and repair commercial-industrial refrigeration systems (walk-ins, reach-ins, freezers, domestic refrigerators, and ice machines), including refrigerant recovery, leak detection, charging, and documentation in accordance with EPA requirements.
Conduct system testing and tuning such as valve rebuilding, airflow measurement, duct leakage testing, balancing, and heat load/loss calculations to ensure peak system performance.
Adjust and reprogram Building Automation Systems/Energy Management Systems (BAS/EMS)—including BAS platforms such as BACnet, Trane, Siemens, or Johnson Controls—to ensure comfort, efficiency, and proper system operation.
Maintain ventilation and exhaust systems, including make-up air units, shop and kitchen ventilation, heaters, and restroom/building exhaust systems.
Perform routine technical tasks such as calibrating sensors and controls, replacing belts, lubricating parts, cleaning coils, threading/cutting pipe, installing ductwork and diffusers, and replacing switches, solenoids, timers, and other control components.
Use and maintain a wide range of trade tools, including multimeters, airflow meters, temperature/humidity instruments, manifold gauges, threaders, cutting torches, and digital diagnostic equipment.
Perform scheduled preventive maintenance following APS procedures, industry standards, and manufacturer specifications for all HVAC-R systems.
Evaluate equipment condition and system performance to recommend upgrades, replacements, or modifications based on observed wear, technological changes, and lifecycle considerations.
Support development of predictive maintenance practices by using BAS data, performance trends, and sensor diagnostics to identify emerging issues.
Monitor buildings for signs of deferred maintenance or declining system performance and report findings with or without recommendations.
Use computerized maintenance management systems (CMMS) to review assignments, record work performed, log materials and refrigerant use, and close work orders.
Operate digital tools, mobile applications, and telecom devices for communication, scheduling, troubleshooting, and accessing technical information.
Maintain required records such as MSDS logs, compliance documentation, material use reports, and technical service notes.
Provide courteous, proactive, and responsive support to principals, building managers, staff, and other APS personnel regarding HVAC concerns.
Investigate comfort complaints, evaluate system performance, determine root causes, and resolve issues—including making fine-tuned adjustments to satisfy comfort needs when systems are sized and balanced appropriately.
Coordinate work with contractors, vendors, inspectors, and County officials for inspections, code compliance, and specialized support.
Provide on-the-job training and task guidance to HVAC I/II staff, student workers, and special program personnel to support skill development and safe work practices.
Offer technical direction in areas of expertise, including complex diagnostics, BAS/EMS controls, or advanced repair procedures; may assume temporary work leadership in the absence of the Lead HVAC Mechanic.
Review routine maintenance work performed by lower-level staff and provide immediate corrective instruction when required.
Follow all applicable OSHA/VOSHA regulations, APS safety procedures, and county building and fire codes, ensuring the safe handling of refrigerants and hazardous materials.
Use appropriate PPE, follow lockout/tagout procedures, and maintain safe work practices while working around energized equipment, chemicals, confined spaces, and elevated locations.
Identify and report safety risks, ensure safe conditions at worksites, and respond to emergencies to restore HVAC service when necessary.
Prepare assignments by reviewing work orders, schedules, and system information; requisition parts and materials and maintain stock on the service vehicle.
Maintain regular communication with the supervisor and customers via radio, phone, or digital platforms, keeping all parties informed of progress and issues.
Drive to multiple APS sites, perform basic vehicle upkeep, and support districtwide operations requiring multi-site service.
Set up and cleanup worksites, maintain shop areas, and perform other trade-related tasks as assigned.