Twin City Backward Inclined Hinged Restaurant Exhaust Fan - BHRE - IM-610 - Manual (Page 11)

Twin City IM-610 11
Symptom Cause Corrective Action
Fan does not operate
Electrical Supply
Check disconnect switch, fuses/breakers.
Check for correct supply voltage.
Drive
Check for broken belts. Tighten loose belts,
see Belt Adjustment
Motor
Check overload protection on motor. Verify
correct motor horsepower.
Too little air
Wheel rotating in wrong direction Check wheel rotation, see Fig. 8, P.6
System resistance too high
Check system backdraft dampers, ductwork
and filters.
Fan speed lower than design Tighten belt; close variable speed sheave.
Dampers closed Inspect and repair.
Improper wheel alignment
Center wheel on inlet, check wheel gap/over-
lap against Fig. 7, P.6
Excessive dirt/grease on wheel Clean wheel.
Fan inlet/outlet is restricted
Remove obstruction, check for damage or
unbalance.
Filters (if applicable) are dirty or clogged Clean or replace filters.
Too much air
System resistance lower than expected
Reduce fan speed to reach required operat-
ing point.
Fan speed higher than design Adjust fan speed.
Excessive Noise or
Vibration
Wheel hitting inlet
Center wheel on inlet, check wheel gap/over-
lap against Fig. 7, P. 6
Loose sheave or wheel Align and tighten.
Wheel out of balance Clean wheel; check wheel balance.
Bearings
Lubricate bearings, replace defective bear-
ings; tighten setscrew or bearing bolt, align
bearings.
V-belts
Mismatched belts, replace with matched
belts; Adjust belt tension, replace worn belt.
Fan not properly anchored Secure fan base, see Table 2, P. 3
Loose components Tighten loose hardware.
Excessive Horsepower
Fan Check wheel rotation; reduce fan speed.
System resistance too high
Check dampers; re-size ductwork; check fan
inlet conditions; check filter.
Motor Overloads/
Overheats
Motor improperly wired
Check motor wiring against wiring diagram
on motor nameplate.
Incorrect wheel rotation Change wiring leads to correct rotation.
Undersized motor
Check motor ratings against cataloged per-
formance.
Fan rpm too high
Check fan rpm; open variable pitch sheave
on motor.
Over/Under line voltage Contact power company.
Fan
Check for bent shaft; check for proper belt
tension; check for damaged bearings.
Table 6.
It is recommended that the users and installers of this equipment familiarize themselves with AMCA Publication
#201, "Fans and Systems" and publication # 202 "Troubleshooting" which are published by the Air Movement
and Control Association (AMCA), 30 West University Drive, Arlington Heights, Illinois 60004. www.amca.org