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This Concept Map, created with IHMC CmapTools, has information related to: Forced Draft Fan, Forced Draft Fan Problems Overheated bearings, Forced Draft Fan objective to burn more FUEL than a naturally induced burner, Forced Draft Fan Problems Fan vibrates or makes noise, Overload on driver due to 1. Speed too high 2. Direction of rotation is incorrect 3. Bent shaft 4. Poor alignment 5. Improper lubrication 6. Wheel wedging or binding on fan housing, Overheated bearings due to 1. Improper lubrication 2. Poor alignment 3. Damaged wheel or driver 4. Bent shaft 5. Abnormal end thrust 6. Dirt in bearings 7. Improper belt tension, Forced Draft Fan Problems Fan capcity below rating, Forced Draft Fan provides Air required for combustion, Air required for combustion to meet complete combustion criterion, which is approximately 10% excess air [1:10 air-fuel ratio by volume], Fan capcity below rating due to 1. Dampers or variable inlet vanes are not adjusted properly 2. Fan inlet or outlet conditions are impaired 3. Multiple air leaks within the system 4. Damage sustained to the blower wheel 5. Direction of rotation is incorrect, Fan vibrates or makes noise due to 1. Worn bearings 2. Unstable foundation 3. Foreign material in the fan causing an imbalance 4. Misalignment of bearings, couplings, wheel or v-belt drive 5. Damaged wheel or motor 6. Bent shaft 7. Worn coupling 8. Loose dampers or variable inlet vanes 9. Speed too high or incorrect fan rotation 10. Vibration to fan transmitted from another source 11. Uneven blade wear 12. Loose or broken bolts or set screws, Forced Draft Fan Problems Overload on driver