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Filters
One-inch washable aluminum mesh filters are standard
on model KSQ. Optional two-inch MERV 13 filters may
be supplied on some Bottom intake configurations.
Filters should be cleaned and/or replaced on a regular
basis for optimum efficiency. To remove the filters,
loosen thumb screw on the sides of the Weatherhood
and drop down the filter tray. Then slide the filters out
the front of the hood. AL filters can be washed in a
mild detergent solution. If desired, an adhesive spray
available at most filter distributors can be applied to
increase filter efficiency. Follow filter manufactures
guidelines for replacement intervals on pleated filters.
Troubleshooting
WARNING
Before taking any corrective action, make certain unit
is not capable of operation during repairs.
PROBLEM
CAUSE
Blown fuse or breaker
Ventilator
Incorrectly wired
Inoperative
Defective motor
Clogged filters
Incorrect wheel rotation
Excessive dirt build up on wheel
Improper wheel alignment
Insufficient
Fan RPM to slow
Airflow
Damper closed
Loose fitting duct sections
permitting air loss
System resistance to high
Accumulation of material on wheel
Loose wheel
Wheel improperly aligned and
Excessive
rubbing
Noise or
Wheel out of balance
Vibration
Foreign objects in wheel or housing
Ventilator base not securely
anchored
Incorrect wheel rotation
Motor
Shorted motor winding
Overlaoads or
Overheats
Over/Under line voltage
®
For Vari-Green
motor troubleshooting, refer to the Vari-Green Motor Installation, Operation, and Maintenance Manual.
10
Rooftop Supply Mixed Flow Fans
All fasteners should be checked for tightness each
time maintenance checks are performed prior to
restarting unit.
A proper maintenance program will help these units
deliver years of dependable service.
AVERTISSEMENT
Avant d'entreprendre toute action corrective, s'assurer
que l'appareil ne pourra pas fonctionner durant les
réparations.
CORRECTIVE ACTION
Replace or repair
Shut power OFF and check wiring for proper connections
Replace or repair
Clean or replace
Correct rotation, see page 4, step 3 to correct wheel rotation
Clean wheel
Center wheel on inlet cone, see figure 1 (page 4)
Adjust speed with Vari-Green
Inspect/repair damper
Check for secure connection where duct sections are joined
(suggest duct tape at seams for sealed closure)
Check system: proper orientation and operation of
backdraft or control dampers, obstructions in ductwork.
Clean wheel
Tighten set screws
Center wheel on inlet cone, see figure 1 (page 4)
Check wheel balance, rebalance in place if necessary
Remove objects and check for damage or imbalance
Secure properly
Check motor wiring
Replace motor
Contact power company
®
control or VFD (if applicable)
®
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