Aircon FCU Chemical Wash with Full Removal – Only $260
Aircon FCU Chemical Wash with Full Removal – Only $260
Aircon FCU Chemical Wash with Component Removal - $260
Recommended for extremely dirty fan coils with visible clogs between the fins that cannot be removed using a vacuum cleaner.
This service is ideal for locations where an on-wall chemical wash is not viable.
1. Preparation and Safety
Power Off: Ensure the air conditioning system is completely powered off.
Safety Gear: Wear appropriate personal protective equipment (PPE), such as gloves and safety goggles, to protect against chemical exposure.
2. Pump down the system.
Close the Liquid Line Service Valve: The first step is to close the service valve using an Allen key located on the liquid line leading from the condenser to the evaporator. This prevents any more refrigerant from flowing into the evaporator.
Run the Compressor: With the liquid line valve closed, the compressor is turned on. Since the compressor continues to operate, it begins to “suck” the refrigerant out of the evaporator and any associated piping, moving it towards the compressor.
Monitor the System Pressure: While the compressor is running, it’s crucial to monitor the system’s pressure gauges. The suction pressure should start to drop as the refrigerant is removed from the evaporator and suction lines.
Shut Down the Compressor: Once the suction pressure reaches a very low level (often near vacuum conditions but typically above to avoid damaging the compressor with a true vacuum), the compressor should be shut off. This low pressure indicates that most of the refrigerant has been moved out of the evaporator and suction line and is now stored in the condenser or receiver.
Close the Suction Service Valve: After the compressor is shut off, the suction service valve near the compressor inlet should be closed using an Allen key. This action seals the refrigerant in the high side of the system (the condenser and the receiver).
Secure the System: At this point, the refrigerant is contained within the condenser, and the evaporator and associated lines are mostly refrigerant-free. The system is now safe for opening parts of it, such as the evaporator or suction lines, for maintenance or repair without significant loss of refrigerant.
Post-Maintenance Testing and Reopening of Valves: Once the maintenance or repairs are completed, the valves can be reopened. The system must be checked for leaks and proper operation before fully starting up again. This involves vacuuming the evacuated parts, refilling any lost refrigerant if necessary, and carefully monitoring the system to ensure it returns to normal operational pressures and temperatures.
3. Disassembling the FCU
Access the Unit: Open the FCU cover to access the internal components.
Component Removal: Carefully disconnect and remove components such as the filters, blower fan, and coil. Take note of their positions for reassembly.
4. Cleaning Process
Prepare Chemical Solution: Mix the chemical cleaning agent with water as per the manufacturer’s instructions.
Application of Chemical Solution: After spraying the chemical solution, let it sit for 15 minutes to break down and loosen dirt, grime, and microbial growth. The chemical action of the solution softens and dissolves these contaminants, facilitating their removal during the rinsing process and ensuring a thorough clean, especially in areas with stubborn build-up.
Rinse: Use a high-pressure water jet to thoroughly rinse the components.
Dry: Allow the parts to air dry, or use a clean, dry cloth to wipe away excess moisture.
5. Reassembling and Testing
Reassemble the Unit: Once the parts are completely dry, reassemble the FCU, ensuring all components are securely refitted.
Vacuum the Refrigerant Pipes: Evacuate the pipes using a vacuum pump to remove air and moisture.
Reopening of Valves: The valves can be reopened. The system must be checked for leaks and proper operation before fully starting up again.
Refrigerant refill: Refilling any lost refrigerant if necessary, and carefully monitoring the system to ensure it returns to normal operational pressures and temperatures.
Power On and Test: Restore power and test the unit for proper operation, listening for any unusual sounds that could indicate incorrect assembly.
6. Post-Repair Testing
Leak Test Again: Perform another leak test using aircon gas leak detector on the Aircon FCU flare joints.
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