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56 CAH-SVX01A-EN
Troubleshooting
This section is intended to be used
as a diagnostic aid only. For detailed
repair procedures, contact your local
Trane service representative.
Table 8. Air handler troubleshooting recommendations
Symptom Probable Cause Recommended Action
Bearing is
excessively hot
First start after relubrication (grease distribution) Allow machine to cool down and restart.
Over-lubrication Clean surface of grease and purge.
Over tensioned belts Adjust belt tension.
No lubricant Apply lubricant. Check bearings for damage.
Misaligned bearing Correct alignment. Check shaft level.
Motor fails to start Blown fuse or open circuit breaker Replace fuse or reset circuit breaker.
Overload trip Check and reset overload.
Improper wiring or connections Check wiring with diagram supplied on unit.
Improper current supply Compare actual supply power with motor nameplate
recommendations. Contact power company for adjustments.
Mechanical failure Check that motor and drive rotate freely. Check bearing lubricant.
Motor stalls Open phase Check line for an open phase.
Overloaded motor Reduce load or replace with larger motor.
Low line voltage Check across AC line. Correct voltage if possible.
Excessive vibration Poor alignment Align bearing set screws (see Figure 49). Loosen and retighten
bearing set screws.
Bolts not removed. Remove bolts (see the “Isolator Adjustment” section on page 24).
Over tensioned belts Adjust belt tension.
Misaligned drive Align drive.
Motor runs and then
dies down
Partial loss of line voltage Check for loose connections. Determine adequacy of main power
supply.
Starter shorts when motor warms up Replace starter.
Motor does not come
up to speed
Low voltage at motor terminals Check across AC line and correct voltage loss if possible.
Line wiring to motor too small Replace with larger sized wiring.
Motor overheats Overloaded motor Reduce load or replace with a larger motor.
Motor fan is clogged with dirt preventing proper
ventilation
Remove fan cover, clean fan and replace cover.
Excessive motor
noise
Motor mounting bolts loose Tighten motor mounting bolts.
Rigid coupling connections Replace with flexible connections.
Worn motor bearings Replace bearings and seals.
Fan rubbing on fan cover Remove interference in motor fan housing.
Rapid motor bearing
wear
Excessive overhung load due to overtensioned
drive
Check belt tension and overhung load.
Excessive overhung load due to a small diameter
motor sheave
Replace sheave with larger one.
Loose fan belt Motor is poorly positioned Adjust belt tension.
Worn or damaged belt Replace belt or belt set. Check sheave alignment.
Worn sheaves Replace sheaves.
ƽ WARNING
Hazardous Service
Procedures!
The maintenance and
troubleshooting procedures
recommended in this section of the
manual could result in exposure to
electrical, mechanical or other
potential safety hazards. Always
refer to the safety warnings provided
throughout this manual concerning
these procedures. When possible,
disconnect all electrical power
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. When necessary to work
with live electrical components,
have a qualified licensed electrician
or other individual who has been
trained in handling live electrical
components perform these tasks.
Failure to follow all of the
recommended safety warnings
provided, could result in death or
serious injury.