FloAire Canopy Hood - Manual (Page 37)

37
Troubleshooting
The following table lists causes and corrective actions for possible problems with exhaust hoods. Review
this list prior to consulting manufacturer.
Troubleshooting Chart
Problem Potential Cause Corrective Action
Smoke is not being captured/Low
Exhaust Filters are clogged Clean filters
Extreme negative pressure in space Increase MUA Quantity to balance
building
Exhaust Fan operating in incorrect direction Check motor wiring to wiring diagram
located on fan motor
Hood overhang on appliance is not correct Hood should overhang cooking
appliances adequately
Exhaust airflow too low Increase exhaust fan RPM/HP
Exhaust Duct Static Pressure higher than
design Increase exhaust fan RPM/HP or have
ductwork re-worked
No Exhaust Exhaust Fan not running Turn fan disconnect on
Check fan belts
Check circuit breaker/voltage
Exhaust Fan running backwards Wheel should turn per rotation arrow on
fan
3 Phase Motor direction may be
reversed by switching any 2 leads
1 Phase Motors must be wired per their
label
Fan is on incorrect hood Make sure electrical package is
controlling the correct fan
No Make-Up Air Make-Up Air Fan not running Turn Fan disconnect on
Check fan belts
Check circuit breaker/voltage
Make-Up Air Damper closed Ensure blades open on damper
Make-Up Air Fan running backwards Wheel should turn per rotation arrow on
fan
3 Phase Motor direction may be
reversed by switching any 2 leads
1 Phase Motors must be wired per their
label
Make-Up Air Duct Static Pressure higher
than design Eliminate flexible ductwork and remove
number of elbows in duct.
Clogged Make-Up Air Filters Clean filters
Fire System activated or not armed Microswitch on Fire System is keeping
make-up air from operating and fire
system must be armed
Exhaust/Make-Up Air Motor cycles on
and off Motor Over-amping Make sure motor amperage is below
FLA of motor label
Ensure motor wiring is adequately sized
Exhaust air temperature too high Increase exhaust airflow or use higher
temperature rated motor
Grease does not drain Grease trough full Clean grease trough behind hood filters
Grease dripping from hood Hood not being cleaned often enough Clean surface of hood more frequently
Exhaust rate too low Speed up exhaust fan
Hood is vibrating Vibrating Exhaust or MUA Fan Find source of vibration in fans and
correct (Often times a rag or other
debris will be in exhaust fan wheel)
Light Globes are full of fluid Duct Leak above hood Check ductwork or fan to roof
connection for leaks and seal where
necessary