Product Overview

Summary: This Safe Operating Procedure provides a structured, WHS-focused approach to retrofitting and upgrading ageing HVAC systems in Australian workplaces. It guides technicians and project teams through safe isolation, removal, installation, commissioning and verification, reducing risks associated with electrical work, working at height, hazardous materials and indoor air quality issues.

Ageing HVAC systems can present significant safety, compliance and performance risks, including unreliable operation, poor indoor air quality, excessive energy use and non-compliance with current Australian standards. This SOP sets out a clear, step-by-step process for retrofitting and upgrading old HVAC plant and controls in commercial, industrial and institutional facilities. It covers everything from initial condition assessments and risk identification, through to safe isolation, dismantling and removal of legacy equipment, installation of new components, and final commissioning and handover.

Developed with Australian WHS legislation and building services standards in mind, the procedure helps organisations manage key hazards such as electrical shock, working at height, confined spaces, hazardous materials (including refrigerants and potential asbestos in older plant rooms), and manual handling of heavy components. It also addresses integration with building management systems (BMS), verification of ventilation and filtration performance, and documentation requirements for ongoing maintenance and compliance. By adopting this SOP, businesses can modernise their HVAC infrastructure in a controlled, defensible manner that protects workers, occupants and contractors while improving comfort and energy performance.

Key Benefits

• Ensure retrofitting and upgrade works on HVAC systems are planned and executed in line with Australian WHS and building services requirements.
• Reduce the risk of injuries associated with electrical work, working at height, manual handling and exposure to hazardous materials during HVAC upgrades.
• Improve indoor environmental quality and occupant comfort by standardising checks on ventilation rates, filtration and system balancing.
• Streamline coordination between HVAC contractors, facility managers, WHS personnel and other trades through clearly defined roles and communication steps.
• Demonstrate due diligence and compliance to regulators, clients and building owners through consistent documentation, commissioning records and sign-off processes.

Who is this for?

• HVAC Technicians
• Mechanical Services Contractors
• Building Services Engineers
• Facility and Asset Managers
• WHS Managers and Advisors
• Project Managers (Construction and Fit-out)
• Maintenance Supervisors
• Property and Strata Managers
• Energy and Sustainability Managers

Hazards Addressed

• Electric shock and arc flash from isolation and connection of HVAC electrical supplies
• Falls from height when working on roofs, plant platforms and access ladders
• Exposure to hazardous substances including refrigerants, cleaning chemicals and potential asbestos-containing materials in older installations
• Manual handling injuries from lifting, carrying and positioning heavy plant, ductwork and components
• Crush and pinch injuries from moving plant, lifting equipment and duct sections
• Poor indoor air quality during works, including dust, fumes and reduced ventilation for building occupants
• Confined space risks in plant rooms, ceiling spaces and ductwork
• Fire and explosion risks associated with hot works, electrical faults or flammable refrigerants
• Noise exposure from demolition, cutting, drilling and operating plant
• Slips, trips and falls due to tools, offcuts, cabling and debris in work areas

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Abbreviations
• 3.0 Roles and Responsibilities (PCBU, Supervisors, HVAC Technicians, Contractors)
• 4.0 Applicable Legislation, Standards and Codes of Practice
• 5.0 Pre-Start Planning and Risk Assessment
• 6.0 Site Assessment and Condition Survey of Existing HVAC Systems
• 7.0 Isolation, Lockout and Tagout Procedures for HVAC Plant
• 8.0 Hazard Identification and Control Measures (Electrical, Heights, Confined Spaces, Hazardous Substances)
• 9.0 Safe Removal and Decommissioning of Old HVAC Equipment and Components
• 10.0 Handling, Recovery and Disposal of Refrigerants and Other Hazardous Materials
• 11.0 Manual Handling and Use of Lifting Equipment for HVAC Components
• 12.0 Installation and Integration of New HVAC Plant, Ductwork and Controls
• 13.0 Coordination with Building Management Systems (BMS) and Other Trades
• 14.0 Commissioning, Testing, Balancing and Performance Verification
• 15.0 Indoor Air Quality, Ventilation and Filtration Checks
• 16.0 Housekeeping, Site Clean-Up and Waste Management
• 17.0 Emergency Procedures and Incident Response During Upgrade Works
• 18.0 Training, Competency and Licensing Requirements
• 19.0 Documentation, Handover, As-Built Drawings and Maintenance Schedules
• 20.0 Review, Audit and Continuous Improvement of the Procedure

Legislation & References

• Work Health and Safety Act 2011 (Cth) and equivalent state and territory WHS legislation
• Work Health and Safety Regulations 2011 (Cth) and state and territory equivalents
• Safe Work Australia – Code of Practice: Managing the Risk of Falls at Workplaces
• Safe Work Australia – Code of Practice: Confined Spaces
• Safe Work Australia – Code of Practice: Hazardous Manual Tasks
• Safe Work Australia – Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace
• AS 1668.1: The use of ventilation and air conditioning in buildings – Fire and smoke control in buildings
• AS 1668.2: The use of ventilation and air conditioning in buildings – Mechanical ventilation in buildings
• AS/NZS 5149 (series): Refrigerating systems and heat pumps – Safety and environmental requirements
• AS/NZS 3000: Electrical installations (Wiring Rules)
• AS/NZS 3666 (series): Air-handling and water systems of buildings – Microbial control
• NCC (National Construction Code) – Mechanical ventilation and air-conditioning provisions