Trane LWHA Installation Operation & Maintenance page 23

Symptom
Rapid motor bearing wear
Loose fan belt
Short belt Life
Bearing Noise
Low coil capacity
(Chilled Water)
Under CFM or low air flow
Over cfm or high air flow
Water leaking
LWHA Series
Trouble Analysis
Probable cause
Excessive overhung load due to
overtensioned drive.
Excessive overhung load due to a
small diameter motor sheave.
Motor is poorly positioned.
Worn or damaged belt.
Worn sheaves.
Worn sheaves.
Misaligned belt.
Grease or oil on belts.
Belt slipping.
Belts rubbing.
Poor alignment.
Inadequate lubrication.
Incorrect airflow.
Incorrect gpm.
Incorrect water temperature.
Belt loose
Duct leakages
Duct obstruction or too small
causing high static
Dirty filter or coil
Low static due to oversize duct or duct
work too short
Drain pipe choked
Improper or no U-trap
Water carry over due to high velocity
20
TRANE
Recommended Action
Check belt tension and overhung load.
Replace sheave with larger one.
Adjust belt tension.
Replace belt or belt set. Check sheave
alignment.
Replace sheaves.
Replace sheaves.
Realign drive
Check for leaky bearings. Clean belts
and sheaves.
Adjust tension.
Remove obstruction or realign drive for
clearance.
Loosen bearing set screws and re-
align.
Replace bearing.
Check fan-operating conditions.
Check water pumps, valves and lines
for obstructions.
Provide proper water temperature.
Adjust belt tension or clean belt if it is
greasy.
Check duct joining or turning.
Increase fan rpm to overcome high
static but fan and motor working limita-
tions must be considered.
Change filter and clean coil.
Replace pulley to reduce fan rpm to
meet requirement.
Clear drain pipe.
Ensure U-trap installed properly.
Replace pulley to reduce fan rpm.
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