COOK Economizer Fan - Manual (Page 5)

Clean the propeller and air inlets if material build-up is
excessive. Excessive build-up can cause imbalance and
failure of the propeller. When cleaning the propeller, always
clean the entire propeller. Partial cleaning will cause imbal-
ance and will lead to unit failure.
Filters
Filters should be checked within the first two weeks of
operation. If there is no excessive build-up, monthly servic-
ing should be adequate.
To clean reusable aluminum filters, back flush with soap
and water. When clean, shake off excess water and allow
the filter to air-dry before reinstalling it.
Please note the following tables concerning filter sizes.
Motor Bearings
Motor bearings are pre-lubricated and sealed. Under
normal conditions they will not require further maintenance
for a period of ten years. However, it is advisable to have
your maintenance department remove and disassemble
the motor, and lubricate the bearings after three years of
operation in excessive heat and or in a contaminated air-
stream consisting of airborne abrasives.
Economizer Fan Filter Sizes
Unit Type 1 Type 2
Size Length x Width
No.
Req’d
Length x Width
No.
Req’d
24 18-1/4” x 30-1/8” 2 18-1/4” x 33-1/4” 4
30 20-7/16” x 18-1/16” 4 20-7/16” x 25-13/16” 6
36 22-1/4” x 21-1/16” 4 22-1/4” x 29-5/32 6
42 24-1/16” x 29-1/2” 4 26-7/8” x 19-1/4” 6
48 27” x 27” 4 27” x 27” 8
54 29-1/8” x 19-3/8” 6 29-1/8” x 23-5/8” 10
60 37-7/8” x 21-7/8 6 26” x 28-9/16” 10
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook Company represen-
tative or your nearest authorized electric motor service rep-
resentative.
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same di-
rection as the arrows on the motor or belt drive assembly.
•Poor fan inlet conditions. There should be a straight clear duct at the
inlet.
•Improper propeller alignment.
Excessive Vibration and Noise
•Damaged or unbalanced propeller.
•Belts too loose; worn or oily belts.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same di-
rection as the arrows on the motor or belt drive assembly.
•Bearings need lubrication or replacement.
•Fan surge.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same di-
rection as the arrows on the motor or belt drive assembly.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan RPMs.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
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