Troubleshooting
Trouble Cause Remedy
Unusual fan drive vibration
Loose bolts and cap screws
Tighten all bolts and cap screws on all mechanical equipment and
supports.
Worn fan shaft bearings.. Check fan shaft endplay. Replace bearings as necessary.
Unbalanced motor
Disconnect load and operate motor. If motor still vibrates, rebalance
rotor.
Fan noise
Impeller rubbing inside of cylinder
Adjust fan impeller. Adjustment may need to be axial i.e. moving
impeller along the shaft to centralize it between the cylinders or radial
by repositioning bearing or bearings to get the impeller concentric
within the inlets.
Fan shaft bearing. Grease bearings.
Belt squeal or chirping Belt slipping Adjust belt
Scale or foreign substance in
circulating water system
Insufficient blowdown See "Water Treatment" section of this manual.
Water treatment deficiency
Consult competent water treating specialist. See "Water Treatment"
section of this manual
Cold water temperature too
warm.
See "Fluid Cooler Operation."
Entering wet bulb temperature is above design
Check to see if local heat sources are affecting fluid cooler. See if
surrounding structures are causing recirculation of tower discharge air.
Discuss remedy with Marley representative.
Design wet bulb temperature was too low.
May have to increase fluid cooler size. Discuss remedy with Marley
representative
Actual process load greater than design
May have to increase fluid cooler size. Discuss remedy with Marley
representative
Overpumping Reduce water flow rate over fluid cooler to design conditions.
Fluid cooler starved for air
Check motor current and voltage to be sure of correct contract
horsepower. Clean eliminators. Check to see if nearby structures or
enclosing walls are obstructing normal airflow to fluid cooler. Discuss
remedy with Marley representative.
Excessive drift exiting fluid
cooler
Faulty drift elimination
Check to see that eliminators are clean, free of debris and installed
correctly. Replace damaged or worn out eliminators panels.
Water leaking from fan scroll
Water level in tower too high Adjust water level to correct level.
Multiple fan motors serving a single coil section not
being cycled simultaneously
Ensure all fans are operating simultaneously and at the same speed
