Air quality monitoring

De-energise the System: Ensure that the AHU is powered off and isolated from the power supply to prevent accidental activation during cleaning. Personal Protective Equipment (PPE): Use appropriate PPE such as gloves, masks, goggles, and protective clothing to safeguard against dust, contaminants, and cleaning chemicals. 

Containment: Use plastic sheeting or barriers to protect surrounding areas from dust and debris. 

Ventilation: Ensure adequate ventilation in the area, especially when using cleaning chemicals. 

Access Panels: Open and remove access panels to gain entry to internal components. 

Initial Inspection: Conduct a visual inspection to identify areas with visible dirt, debris, or contamination. 

Remove and Assess Filters: Remove air filters and inspect them for dust and particulates. 

Cleaning/Replacing Filters: Clean washable filters with water and a mild detergent. Replace disposable filters with new ones. 

Surface Cleaning: Use a vacuum cleaner with a brush attachment or a soft brush to remove loose dust and dirt from the coils. 

Deep Cleaning: Apply a coil cleaner (approved under TR19 guidelines) if coils are heavily contaminated. Rinse thoroughly with water to remove all residues, ensuring no chemicals are left on the coils. 

Dust and Debris Removal: Manually clean fan blades and the motor casing with a vacuum or cloth. Use a brush for hard-to-reach areas. 

Lubrication: Check if the motor bearings require lubrication and perform this as needed following the manufacturer’s guidelines. 

Duct Cleaning: Use a vacuum to remove dust from accessible ductwork connected to the AHU. This step is critical under TR19 standards, which emphasize the importance of maintaining clean duct systems. 

Plenum Cleaning: Wipe down the interior surfaces of plenum chambers with a damp cloth. 

Use of Biocides and Disinfectants. Application: Apply biocides or disinfectants, if necessary, to areas prone to microbial growth, following safety guidelines and ensuring compatibility with the system materials. 

Reassemble Components. Secure Panels and Filters: Replace and secure access panels and filters properly, ensuring there are no air leaks. Seal Inspection: Check and replace seals if they are damaged or deteriorating. 

Final System Check. Visual Inspection: Conduct a final inspection to ensure all components are clean and properly reassembled. Functional Test: Restore power and test the AHU to ensure it operates correctly and efficiently. 

Record Keeping. Cleaning Logs: Maintain detailed records of the cleaning process, including dates, methods used, findings, and any issues addressed. 

Compliance Documentation: Ensure all procedures comply with TR19 and SGF20 standards, providing documentation as needed for regulatory compliance and audits. 

Regular Cleaning Schedule: Establish a regular cleaning schedule based on the environment and system usage, with more frequent cleaning in high-contamination areas such as kitchens or industrial settings. 

Competency Development: Ensure that maintenance staff are trained and certified in line with TR19 and SGF20 requirements, which include understanding the importance of ventilation hygiene and proper cleaning techniques.