23
Symptom
Probable Cause
Recommended Action
Bearing is excessively hot
Overtensioned belts.
Retension belts.
No lubricant (plummer block type).
Apply grease.
Overlubrication.
Clean surface of grease and purge.
Misaligned bearing.
Correct alignment and check that shaft is level.
Motor stalls
Short circuit, phase to earth.
Check line phases and terminal block connection.
Overloaded motor.
Reduce system load, fan driven speed or increase motor
capacity.
Motor overheats
Overloaded motor.
Reduce load or replace with larger motor.
Motor fan damaged.
Replace motor fan/clean.
Excessive vibration
Poor pulley alignment.
Check pulley alignment.
Transport brackets not removed.
Remove items used for transport only.
Overtensioned belts.
Retension belts.
Fan/unit vibration isolator collapsed.
Replace vibration isolator.
Excessive motor noise
Motor mounting bolts loose.
Tighten motor mounting bolts.
Worn motor bearings.
Replace bearings and seals.
Excessive fan noise
Fan rubbing on inlet cone or guard.
Remove item and repair.
Worn fan bearings.
Replace bearings and seals.
Loose impeller.
Retighten hub.
Premature belt wear
Incorrect tension or alignment.
Re-tension and align.
Dirt or grease on belts.
Clean belts and pulleys; check for grease leaks.
Belts rubbing.
Remove obstruction.
Odd belts being fitted.
Replace with full set.
Filters collapsing
Blocked with dirt.
Change at advised dirty condition.
Air velocity too high.
Check unit running conditions.
Filters wrong size.
Replace with filter sizes as supplied
from Trane.
Damper seizing
Blade bent.
Repair or replace blade.
Spindle or mechanism loose.
Tighten lever fixings.
Actuator loose.
Refit actuator correctly.
Low coil capacity
Incorrect airflow.
Check fan operating conditions.
Incorrect water flow.
Check water pumps, valves, and lines for obstructions.
Incorrect water temperature.
Provide correct water temperature.
Coil tubes are blocked.
Clean and unblock tubes.
Expansion valve not operating DX.
Check sensing-bulb location and valve operation.
Poor refrigerant distribution DX.
Check for blockage in distributor and tubes.
Leaking coil
Header/exposed pipe damage.
Repair damaged part.
Cracks in joints due to strain of
Check support and alignment of pipework and rectify.
pipework on headers.
Swelling of joints due to frost.
Check frost protection method and correct, improve.
(Water-hammer Steam Coils)
Trapping of steam supply.
Drain pan overflow
Incorrect hydraulic trapping.
Resize/fit trap and check air break arrangement.
Blockage in trap.
Clean trap and refit.
7. Troubleshooting
CLCH-SVX05A-GB
