Product Overview

Summary: This SOP sets out a clear, repeatable method for calibrating and testing HVAC control systems so they operate safely, reliably and in line with Australian standards. It helps organisations manage WHS risks linked to poor air quality, temperature extremes and plant faults, while improving energy efficiency and occupant comfort.

Poorly calibrated HVAC controls can create serious WHS and operational issues, from heat stress and thermal discomfort to inadequate ventilation, indoor air quality complaints and increased risk to vulnerable occupants. This Safe Operating Procedure provides a structured, end‑to‑end process for the safe calibration and functional testing of HVAC control components, including sensors, actuators, thermostats, dampers, valves, VAV boxes and Building Management System (BMS) interfaces. It is designed specifically for Australian workplaces and helps duty holders demonstrate that building services are maintained so they do not pose a risk to health and safety.

The document guides technicians and supervisors through pre‑work risk assessment, isolation and lock‑out of plant where required, verification of instruments, calibration steps, functional testing, fault finding and return‑to‑service checks. It also addresses communication with building occupants, documentation of test results, and escalation pathways when performance falls outside design or legislative requirements. By implementing this SOP, organisations can reduce unplanned downtime, support compliance with WHS legislation and relevant Australian Standards, and provide a defensible audit trail for regulators, clients and certification schemes such as NABERS and Green Star.

Key Benefits

• Ensure HVAC controls are calibrated to maintain safe temperatures, ventilation rates and indoor air quality for building occupants.
• Reduce WHS risks associated with thermal stress, poor air quality and plant malfunction by applying a consistent, risk‑based testing process.
• Standardise HVAC calibration and testing practices across sites, contractors and shifts, improving reliability and reducing rework.
• Support compliance with Australian WHS legislation, building codes and relevant Australian Standards through documented, auditable procedures.
• Optimise energy performance and equipment life by confirming that control strategies, setpoints and sequences are operating as designed.

Who is this for?

• HVAC Technicians
• Building Services Engineers
• Facilities and Maintenance Managers
• WHS Managers and Advisors
• Property and Asset Managers
• Commissioning Engineers
• Energy and Sustainability Managers
• Site Supervisors (Construction and Fit‑out)
• Mechanical Contractors
• Compliance and Quality Managers

Hazards Addressed

• Exposure to extreme temperatures in plant rooms and mechanical spaces during testing activities
• Electrical shock or arc flash when working on control panels, VSDs and BMS hardware
• Contact with moving mechanical components such as fans, belts and dampers during functional testing
• Slips, trips and falls in plant areas, roof spaces and ceiling cavities while accessing sensors and control devices
• Respiratory irritation or illness due to inadequate ventilation or disturbed dust and contaminants during testing
• Heat stress or cold stress for occupants caused by incorrectly calibrated controls or disabled safety interlocks
• Manual handling injuries from accessing, lifting or repositioning control components and test equipment
• Falls from height when accessing rooftop units, high‑level ductwork or ceiling‑mounted sensors
• Unintended plant start‑up during calibration due to inadequate isolation or lock‑out procedures

Included Sections

• 1.0 Purpose and Scope
• 2.0 References, Standards and Legal Requirements
• 3.0 Definitions and Abbreviations (HVAC, BMS, VAV, Setpoints, Deadband, etc.)
• 4.0 Roles, Responsibilities and Competency Requirements
• 5.0 Required Tools, Test Instruments and Calibration Equipment
• 6.0 WHS Risk Assessment and Permit Requirements
• 7.0 Isolation, Lock‑out/Tag‑out and Plant Access Procedures
• 8.0 Pre‑Calibration Checks (Visual Inspection and System Status Verification)
• 9.0 Calibration Procedures for Sensors, Thermostats and Transmitters
• 10.0 Calibration and Testing of Actuators, Dampers, Valves and VAV Boxes
• 11.0 BMS and Control Logic Verification (Setpoints, Schedules and Alarms)
• 12.0 Functional Performance Testing and Acceptance Criteria
• 13.0 Indoor Environmental Conditions Verification (Temperature, Humidity, Airflow)
• 14.0 Fault Identification, Troubleshooting and Escalation
• 15.0 Return‑to‑Service Checks and System Reinstatement
• 16.0 Documentation, Test Records and Calibration Labels
• 17.0 Communication with Occupants and Stakeholders
• 18.0 Environmental and Energy Efficiency Considerations
• 19.0 Review, Continuous Improvement and Re‑calibration Intervals

Legislation & References

• Work Health and Safety Act 2011 (Cth) and equivalent state and territory WHS Acts
• Work Health and Safety Regulations 2011 (Cth) and equivalent state and territory WHS Regulations
• Safe Work Australia – Managing the Work Environment and Facilities Code of Practice
• Safe Work Australia – Managing Risks of Plant in the Workplace Code of Practice
• AS 1668.2: The use of ventilation and air conditioning in buildings – Mechanical ventilation in buildings
• AS 3666.2: Air-handling and water systems of buildings – Microbial control – Operation and maintenance
• AS/NZS 5149 (series): Refrigerating systems and heat pumps – Safety and environmental requirements
• AS/NZS 3000: Electrical installations (Wiring Rules)
• National Construction Code (NCC) – Section J and mechanical services provisions relevant to HVAC performance
• NABERS Indoor Environment and Energy rating guidelines (as applicable to HVAC performance verification)