VAV Testing & HVAC System Diagnostics Sydney
ENGIC performs diagnostic testing of VAV systems, air conditioning equipment and controls across Sydney to identify why a system is not performing. This goes beyond standard balancing: it isolates the cause and gives you an actionable finding per terminal.
We test each terminal physically and compare the result against what the BMS reports, which is where most unexplained comfort and airflow problems are found.
TAB reports within 24 hours - every project
What It Is & When It's Required
What it is
- Functional testing of VAV dampers and actuators terminal by terminal
- Physical airflow measurement compared against BMS reported values
- Assessment of installed system performance against design intent
Why it matters
- A terminal can report correctly on the BMS while delivering nothing
- Comfort complaints are often a control fault, not a capacity problem
- Rectification is far cheaper when the specific faulty terminal is known
When it's required
- Ageing VAV systems with intermittent performance issues
- Comfort complaints that standard maintenance has not resolved
- Pre-refurbishment assessment of current system condition
- When no design documentation exists and performance must be characterised
BMS values are reported, not measured. Where a controller has drifted, an actuator has stuck or a sensor is misreading, the BMS can show a healthy system while the space is not receiving the air it needs.
Systematic terminal-by-terminal testing with calibrated instruments, cross-checked against the BMS, produces a defined list of what is faulty and what to do about it, rather than a general observation that the system underperforms.
What's Included in Our Service
Review & Preparation
- Review of available design documentation and BMS schedules
- Identification of terminals, zones and controls in scope
- Coordination with BMS contractor for system access where required
Diagnostic Testing
- Functional testing of each VAV damper and actuator through its range
- Physical airflow measurement at each terminal or zone
- Comparison of BMS reported values against measured values
- Identification of non-responsive, stuck or incorrectly registered components
Findings & Recommendations
- Findings recorded per terminal rather than per system
- Recommendations for rectification against each finding
- Prioritisation of items affecting occupied or critical areas
Diagnostic testing uses the same calibrated Testo and IMI instruments as our commissioning work, so the measured values stand up to consultant review.
Your Deliverables – Diagnostic Assessment Report
Every diagnostic project includes a structured assessment report delivered within 24 hours of site testing.
- Findings listed per terminal or system component
- BMS reported value against measured value for each point tested
- Damper and actuator functional status
- Recommendation for rectification against each finding
- Clear notes on access limitations and untested items
Systems & Capability
Systems
- VAV terminals and zone controllers
- Constant volume and dual duct systems
- FCU, PAC and AHU based systems
- BMS controlled air distribution
- Motorised dampers and actuators
Capability
- Occupied buildings and live tenancies
- Systems with no available design documentation
- Pre-refurbishment condition assessment
- Post-installation troubleshooting
- Comfort complaint investigation
Frequently Asked Questions
What is VAV testing?+
VAV testing is the functional and performance testing of variable air volume terminals. Each damper and actuator is driven through its range to confirm it responds, and the airflow delivered is measured physically and compared against both the design figure and the value the BMS is reporting.
How is this different from air balancing?+
Air balancing sets a working system to its design figures. Diagnostics is for when a system will not reach those figures, or reached them once and no longer does. The output is a list of faults and recommended rectification rather than a set of balanced readings.
Why compare BMS readings against physical measurement?+
The BMS reports what its controllers and sensors believe is happening. Where a sensor has drifted, an actuator has stuck or a terminal has been registered against the wrong address, the reported value and the actual airflow diverge. Measuring physically at the terminal is the only way to confirm which is correct.
Can you work on a system with no design documentation?+
Yes. Where drawings and schedules are unavailable we characterise the system as installed by measuring it, which gives you a documented baseline of current performance to plan maintenance or refurbishment against.
What do you need before attending site?+
Any available mechanical drawings and BMS schedules, a description of the symptoms and the areas affected, and BMS access or a BMS contractor available on the day. None of these are essential, but each one shortens the investigation.
Do you guarantee a 24-hour report?+
Yes. Every diagnostic project includes an assessment report delivered within 24 hours of site testing.
Request a Quote for VAV Testing & HVAC Diagnostics in Sydney
ENGIC investigates underperforming HVAC systems across Sydney, giving mechanical contractors, builders and facility managers a defined list of faults and what to do about them.
TAB reports within 24 hours - every project
Request a Quoteor call +61 493 987 289 / email info@engic.com.au