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TRANE
Trouble Analysis
Use the tables in this section to assist
in identifying the cause of causes of a
malfunction in LWHA operation. The
column header RECOMMENDED
ACTION
will
suggest
procedures.
Note: These Tables are intended as a
diagnostic aid only. For detailed repair
procedures, contact your local Trane
Service Company.
IMPORTANT
!
DISCONNECT
ELECTRICAL
POWER SOURCE AND ALLOW
ALL ROTATING EQUIPMENTTO
STOP COMPLETELY BEFORE
INSPECTING OR SERVICING
THE UNIT. FAILURE TO DO SO
MAY RESULT IN PERSONAL
INJURY OR DEATH FROM
ELECTRICAL
SHOCK
MOVING PARTS.
23
WARNING
!
DISCONNECT
ELECTRICAL
POWER PRIOR TO ACCESS
repair
INTO A FAN DUCTWORK. EVEN
WHEN LOCKED OUT ELECTRI-
CALLY, FANS MAY CAUSE INJURY
OR DAMAGE IF THE IMPELLER IS
SUBJECT TO "WINDMILLING".
THE IMPELLER SHOULD BE
SECURED TO PHYSICALLY
RESTRICT
ROTATIONAL
MOVEMENT.
FAILURE
TO
SECURE IMPELLER CAN CAUSE
SEVERE PERSONAL INJURY OR
DEATH.
OR
LWHA Series
Trouble Analysis
Symptom
Probable cause
Bearing is excessively hot
Over tensioned belts.
No lubricant / lubrication dry-out
Misaligned bearing.
Motor fail to start
Blown fuse or open circuit breaker.
Overload trip.
Inproper wiring or connections.
Improper power supply.
Mechanical failure.
Motor stalls
Open phase.
Overloaded motor.
Low line voltage.
Excessive vibration
Over tensioned belts
Misaligned drive
Motor runs and then dies down
Partial loss of line voltage.
Stator shorts when motor warms up.
Motor does not come up to speed.
Low voltage at motor terminals.
Line wiring to motor too small.
Motor overheats
Overloaded motor.
Motor fan is clogged with dirt
preventing proper ventilation.
Excessive motor noise.
Motor mounting bolts loose.
Worn motor bearings.
Fan rubbing on fan cover.
TRANE
Recommended Action
Adjust tension.
Replace bearing.
Correct alignment. Check shaft level.
Replace fuse or reset circuit breaker.
Check and reset overload.
Check wiring with diagram supplied on
unit.
Compare actual supply power with
motor nameplate recommendations.
Contact power company for adjust-
ments.
Check that motor and driver rotate freely.
Check line for an open phase.
Reduce load or replace with larger
motor.
Check across AC line. Correct voltage
if possible
Adjust belts tension.
Align drive.
Check for loose connections.
Determine adequacy of main power
supply.
Replace stator / motor.
Check across AC line and correct volt-
age loss if possible.
Replace with larger sized wiring.
Reduce load or replace with a larger
motor.
Remove fan cover, clean fan and re-
place cover.
Tighten motor mouting bolts.
Replace bearing.
Remove interference in motor fan
housing.
24
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