Title: Instructions manual - THGT fan.pdf
Possible cause System pressure unstable Impeller imbalance Motor bearings worn / damaged Drive belts loose or too tight Impeller drive shaft loose Impeller drive shaft bearings Impeller drive shaft bent / damaged Bearing or drive missalignment Damage to impeller Distortion to fan assembly System pressure higher than design Impeller rotation incorrect Impeller speed higher than design System pressure higher than design System pressure higher than design Impeller rotation incorrect Impeller speed lower than design Overheat device Incorrect electrical power supply Isolator switched out Fuse / overload open Belt drive fault Broken belt Fan stall Impeller , pulleys loose Bearing, drive missalignment Debris, dirt on impeller Impeller imbalance Bearing damage Belt drive worn Loose fixings Vibrating duct work Mismatched belts