The centrifugal blower fan is one of the key components of a wall-hung boiler. It is primarily responsible for supplying combustion air and exhausting waste gas, directly affecting combustion efficiency and safety. Here is a detailed analysis of the blower fan:
1. Core Functions of the Centrifugal Blower Fan
Oxygen Supply and Combustion Aid: It draws outside air into the combustion chamber to ensure complete combustion of the fuel gas.
Waste Gas Exhaust: It forces the exhaust gas after combustion through the flue, preventing the retention of harmful gases such as CO.
Air Pressure Monitoring: Working in conjunction with an air pressure switch, it detects whether ventilation is normal, avoiding safety hazards caused by blockages or malfunctions.
2. Common Types of Centrifugal Blower Fans
Constant Speed Centrifugal Blowers: Single speed, simple structure but higher energy consumption, mostly used in older centrifugal blower models.
Variable Speed Centrifugal Blowers (DC Inverter): Automatically adjusts speed according to load, saving energy and reducing noise, widely used in modern wall-hung boilers.
3. Typical Faults and Troubleshooting of Centrifugal Blower Fans
Abnormal Noise from Centrifugal Blowers:
Causes: Worn bearings, dust accumulation or deformation on the blades, loose fixing screws.
Solutions: Clean the centrifugal blades, tighten screws, replace the bearings or the entire fan if the problem is severe.
Insufficient Air Pressure/Error Reporting from Centrifugal Blowers:
Causes: Blocked flue, faulty air pressure switch, damaged blower fan capacitor (for fixed-speed models).
Solutions: Clean foreign objects from the centrifugal flue, check the switch wiring, replace parts if necessary.
Blower Fan Won't Start:Causes: Power supply failure, burnt-out motor, abnormal control board signal.
Solutions: Use a multimeter to check the motor resistance and check the control board output voltage.
4. Centrifugal Blower Fan Maintenance Recommendations
Regular Cleaning of Centrifugal Blowers: Clean the blades of dust before each heating season (operate after power is off).
5. Centrifugal Blower Fan Replacement Precautions: Ensure there are no leaks at the flue connections to prevent backflow of exhaust gas.
6. Centrifugal Blower Fan Matching: The centrifugal blower must match the original manufacturer's specifications (voltage, power, air pressure).
7. Professional Centrifugal Blower Installation: Due to gas safety concerns, it is recommended that this be performed by after-sales personnel. CO emissions must be tested after the centrifugal blower has been adjusted.
