Downflo Oval, DFO 2-8 to 4-128
36
Problem
Probable Cause
Remedy
Fan blower and motor
do not start
Improper motor wire size
Rewire using the correct wire gauge as specified by
national and local codes.
Not wired correctly
Check and correct motor wiring for supply voltage.
See motor manufacturer's wiring diagram. Follow
wiring diagram and the National Electric Code.
Collector not wired for available
voltage
Correct wiring for proper supply voltage.
Input circuit down
Check power supply to motor circuit on all leads.
Electrical supply circuit down
Check power supply circuit for proper voltage.
Check for fuse or circuit breaker fault. Replace as
necessary.
Damaged motor
Replace damaged motor.
Fan blower and motor
start, but do not stay
running
Incorrect motor starter installed Check for proper motor starter and replace if
necessary.
Access doors are open or not
closed tight
Close and tighten access doors. See Filter
Installation.
Hopper discharge open
Check that dust container is installed and properly
sealed.
Damper control not adjusted
properly
Check airflow in duct. Adjust damper control until
proper airflow is achieved and the blower motor’s
amp draw is within the manufacturer’s rated amps.
Electrical circuit overload
Check that the power supply circuit has sufficient
power to run all equipment.
Clean-air outlet
discharging dust
Filters not installed correctly
See Filter Installation.
Filter damage, dents in the end
caps, gasket damage, or holes
in media
Replace filters as necessary. Use only genuine
Donaldson replacement parts. See Filter Installation.
Access cover(s) loose
Tighten access doors securely. See Filter Installation.
Insufficient airflow
Fan rotation backwards
Proper fan rotation is clockwise when viewed from
the motor side or counterclockwise when viewed
through the inlet cone. See Preliminary Start-Up
Check.
Access doors open or not
closed tight
Check that all access doors are in place and
secured. Check that the hopper discharge opening is
sealed and that dust container is installed correctly.
Fan exhaust area restricted
Check fan exhaust area for obstructions. Remove
material or debris. Adjust damper flow control.
Filters need replacement
Remove and replace using genuine Donaldson
replacement filters. See Filter Removal and
Installation.
Troubleshooting
