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My ventilator isn't moving as much air as I anticipated. Why?
Belt-Drive Axial Downblast Exhaust Ventilators
a) The system resistance could be too high. Check system for proper operation of backdraft or control dampers or obstruction in duct work. b) The propeller may be running backwards. Correct rotation. c) There may be a damper that is closed. Inspect and repair damper. d) The fan speed may be too slow. Check that drive combination is correct, adjust VP pulleys to less turns open.
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Why is my exhaust ventilator not working?
Belt-Drive Axial Downblast Exhaust Ventilators
a) You may have a blown fuse or breaker. Replace or repair. b) Motor may be defective. Replace or repair. c) Fan my be incorrectly wired. Shut power OFF and check wiring for proper connections. d) The pulleys may be out of alignment or loose. Check alignment and tighten. e) The belts may be broken. Replace belts. f) The electricity may be turned off. Contact local power company.
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Why is my fan moving more air than I anticipated?
Belt-Drive Axial Downblast Exhaust Ventilators
You may have miscalculated your system's static pressure. Check calculation and adjust pulleys to more turns open.
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Why is my fan so noisy?
Belt-Drive Axial Downblast Exhaust Ventilators
a) The bearings may be loose or defective. Tighten or replace bearings. b) There may be foreign material inside your bearings. Replace bearings. c) The motor pulley and/or fan pulley may not be tightened on the shaft. Check alignment and tighten setscrews and/or bushings. d) The propeller may be loose. Tighten set screws or taper bushing screws. e) The belt tension may be too loose or too tight. Adjust belt tension. f) Belts may be worn, oily or dirty. Clean or replace belts. g) Your pulleys may not be aligned correctly. Re-align pulleys. h) The propeller may be crooked or damaged. Replace propeller. i) The fan may not be securely anchored. Secure properly. j) The fan shaft may be bent. Replace shaft and propeller. k) The fan propeller may be out of balance. Replace propeller. h) The motor hood may be loose and rattling. Tighten acorn nuts to secure motor hood.
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Why is my motor overloading and shutting off?
Belt-Drive Axial Downblast Exhaust Ventilators
a) Your propeller RPM may be too high. Check that the drives are correct, increase turns open on VP pulley. b) The motor may have a shorted motor winding. Replace motor. c) The propeller may be rotating in the wrong direction. Check that motor is wired correctly. d) The power source may be over/under line voltage. Contact your local power company. e) The belt may be slipping. Tighten belt, match belt to pulley.
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