TRANE
R
General
Use the tables in this section to assist in identifying the cause or causes of a malfunction in Air Handler operation. The
column header RECOMMENDED ACTION will suggest repair procedures.
Note: These tables are intended as a diagnostic aid only. For detailed repair procedures, contact your local Trane Service
Company.
Trouble Analysis
Loosen bearing setscrews and realign
Grease bearing(s) (Plummer block)
Retension belts
Apply grease
Clean surface of grease and purge
Correct alignment and check that shaft is level
Check across AC line. Correct voltage if
possible
Check line phases and terminal block
connection. Reduce system load, fan
driven speed or increase motor capacity
Remove fan cover, clean fan and replace
cover
Reduce load or replace with larger motor
Replace motor fan / clean
Check pulley alignment
Remove items used for transport only
Retension belts
Replace vibration isolator
Align drive
Tighten motor mounting bolts
Replace bearings and seals
Remove interference in motor fan housing
Remove item and repair
Replace bearings and seals
Retighten hub
Re-tension and align
Clean belts and pulleys; check for grease
leaks
Remove obstruction
Replace with full set
Change at advised dirty condition
Check unit running conditions
Replace with filter
sizes as supplied from Trane
Poor alignment
Inadequate lubrication
Overtensioned belts
No lubricant (plummer block type)
Overlubrication
Misaligned bearing
Low line voltage
Short circuit, phase to earth (open Phase)
Overloaded motor
Motor fan is clogged with dirt preventing
proper ventilation
Overloaded motor
Motor fan damaged
Poor pulley alignment
Transport brackets not removed
Overtensioned belts
Fan / unit vibration isolator collapsed
Misalign drive
Motor mounting bolts loose
Worn motor bearings
Fan rubbing on fan cover
Fan rubbing on inlet cone or guard
Worm fan bearings
Loose impeller
Incorrect tension or alignment
Dirt or grease on belts
Belts rubbing
Odd belts being fitted
Blocked with dirt
Air velocity too high
Filter wrong size
Bearing noise
Bearing is excessively hot
Motor stalls
Motor overheats
Excessive vibration
Excessive vibrator
Excessive motor noise
Excessive fan noise
Premature belt wear
Filter collapsing
Symptom Probable Cause Recommended Action
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