1. Quick Troubleshooting for Common Faults
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Unit fails to start: Inspect power supply circuits, terminal connections and control panel settings. This fault is mostly caused by loose wiring or disabled zone switches.
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Insufficient air volume & air velocity decay: Prioritize checking clogged pre‑filters, then test HEPA filter resistance and offset of fan frequency‑conversion parameters.
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Abnormal noise from single unit: Main causes include loose fan mounting screws, dust accumulation inside air ducts and worn fan bearings. Problems can be solved by tightening components, cleaning or replacing spare parts.
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Uneven air velocity across whole zone: Verify consistency of group‑control system parameters, unobstructed return‑air passages and whether FFU layout is blocked.
2. Graded Filter Replacement Standards
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G4 pre‑filter: Clean every 1‑2 months in general workshops; clean or replace every 30 days in heavy‑dust workshops. Reusable for 2‑3 washing cycles.
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H13 HEPA filter: Replace every 12‑16 months under normal operating conditions; replace immediately when resistance doubles.
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H14 HEPA filter: Replace every 10‑14 months for high‑cleanliness scenarios. Strictly follow replacement cycles in aseptic workshops to avoid microbial exceedance risk.
Leakage test and air‑velocity calibration shall be performed after filter replacement to guarantee qualified operation.
3. Long‑Term Energy‑Saving Maintenance Tips
Avoid continuous full‑load operation; lower air velocity during idle periods. Regularly clean ceiling return‑air ducts to ensure smooth air circulation and reduce fan load. Never place materials or pipelines to block FFU air‑outlet and air‑inlet surfaces. Calibrate group‑control system periodically to prevent rising energy consumption caused by parameter drift. Establish equipment‑operation ledgers to record running hours, filter‑replacement time and fault logs for standardized maintenance.
Standardized maintenance effectively prevents defective operation, stabilizes cleanroom environment, maximizes energy‑saving performance of EC fans and reduces long‑term operational costs.
