What’s Involved & Why It Matters

✅ Carbon Monoxide Sensor Functional Test (Cal Gas)

Each CO sensor is exposed to certified calibration gas (“Cal Gas”) to confirm it correctly detects elevated carbon monoxide levels and sends the proper signal to the control system.

Fault testing is also part of the AS 1668.2 standard, to ensure the fans activate and run to 100% if a sensor goes into fault (signal loss, too Low, etc)

🎯 Sensor Calibration at 100ppm

Sensors are fine-tuned using 100ppm reference gas to ensure:

• Accurate triggering thresholds
• Activation of the fans at the Co controller
• Accurate measurement by the sensor
• Reliable fan ramp-up during real exhaust events

🌀 Fan Condition Inspection

Technicians visually and mechanically inspect:

• Bearings
• Belts (if applicable)
• Mountings
• Airflow obstructions
• Physcial condition
• Secure Mounting
• Springs and rubber feet
• Tight fitting of Fan Hub

This reduces the likelihood of failures during a high-CO events, sensor fault events, fire mode if connected to the Fire Indication Panel (FIP), and daily air flush (100% of the air to be exchanged once every 24 hours).

⚡ Electrical Load Testing (Fans & VSDs)

Current draw of:

• Exhaust fans
• Variable Speed Drives (VSDs)

is measured and compared against design specs to catch:

• Motor degradation, vibration, physical condition, Polling, High Current draw over FLA
• Overloading, program settings, alarms in the VSD
• Imminent failure risks, earth faults, noisy unit
• Dust and sediment removal, especially in the cooling fan

⏱ Time Clock / Purge Cycle Check

While additional time clock activations are permitted — for example during peak traffic periods, tenant occupancy hours, or after extended idle periods — the system must achieve at least one complete air exchange per day across the car park volume.

In practical terms, this ensures:

• Reduced reliance on reactive CO sensor demand alone
• Continuous dilution of residual vehicle emissions
• Prevention of stagnant air pockets in low-use zones
• Compliance with ventilation intent even during low CO event days