SPX Cooling Technologies Hexacool Air Cooled Condenser none User Manual page 29

Troubleshooting
Trouble
Unusual fan drive vibration
Fan noise
Belt squeal or chirping
Scale or foreign substance in
circulating water system
Cold water temperature too
warm.
See "Fluid Cooler Operation."
Excessive drift exiting fluid
cooler
Water leaking from fan scroll
Cause
Loose bolts and cap screws
Worn fan shaft bearings..
Unbalanced motor
Impeller rubbing inside of cylinder
Fan shaft bearing.
Belt slipping
Insufficient blowdown
Water treatment deficiency
Entering wet bulb temperature is above design
Design wet bulb temperature was too low.
Actual process load greater than design
Overpumping
Fluid cooler starved for air
Faulty drift elimination
Water level in tower too high
Multiple fan motors serving a single coil section not
being cycled simultaneously
remedy
Tighten all bolts and cap screws on all mechanical equipment and
supports.
Check fan shaft endplay. Replace bearings as necessary.
Disconnect load and operate motor. If motor still vibrates, rebalance
rotor.
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.
Grease bearings.
Adjust belt
See "Water Treatment" section of this manual.
Consult competent water treating specialist. See "Water Treatment"
section of this manual
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.
May have to increase fluid cooler size. Discuss remedy with Marley
representative
May have to increase fluid cooler size. Discuss remedy with Marley
representative
Reduce water flow rate over fluid cooler to design conditions.
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.
Check to see that eliminators are clean, free of debris and installed
correctly. Replace damaged or worn out eliminators panels.
Adjust water level to correct level.
Ensure all fans are operating simultaneously and at the same speed
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