Troubleshooting, Trouble cause remedy – SPX Cooling Technologies CoolingTower Marley MCW User Manual

Page 27

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27

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 "Tower Operation."

Entering wet bulb temperature is above design

Check to see if local heat sources are affecting cooling tower. 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 cooling tower size. Discuss remedy with Marley
representative

Actual process load greater than design

May have to increase cooling tower size. Discuss remedy with Marley
representative

Overpumping

Reduce water flow rate over cooling tower to design conditions.

Cooling tower starved for air

Check motor current and voltage to be sure of correct contract
horsepower. Clean fill and eliminators. Check to see if nearby structures
or enclosing walls are obstructing normal airflow to cooling tower.
Discuss remedy with Marley representative.

Excessive drift exiting cooling
tower

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 height

Multiple fan motors serving a single fill section not
being cycled simultaneously

Ensure all fans are operating simultaneously and at the same speed

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