Diagnostics And Troubleshooting - Trane BCHE Installation, Operation And Maintenance Manual

Diagnostics and Troubleshooting

This section is intended to be used as a diagnostic aid only.
For detailed repair procedures, contact your local Trane
service representative.
Table 43. Troubleshooting recommendations
Symptom
Motor fails to start
Motor stalls
Excessive vibration
Motor runs and then dies
down
Motor does not come up to
speed
Motor overheats
Excessive motor noise
Low water coil capacity
BCX-SVX002A-EN
Probable Cause
Blown line fuse or open circuit breaker
Improper wiring or connections
Improper current supply
Mechanical failure
Low line voltage
Poor fan alignment
Partial loss of line voltage
Low voltage at motor terminals
Line wiring to motor too small
Overloaded motor
Motor fan is clogged with dirt preventing proper ventilation
Motor mounting bolts loose
Fan rubbing on fan cover
Incorrect airflow
Incorrect water flow
Incorrect water temperature
Coil is piped incorrectly
Dirty fin surface
Incorrect glycol mixture
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical
hazards, MUST follow precautions in this manual and
on the tags, stickers, and labels, as well as the
following instructions: Unless specified otherwise,
disconnect all electrical power including remote
disconnect and discharge all energy storing devices
such as capacitors 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.
Recommended Action
Replace fuse or reset circuit breaker.
Check wiring with diagram supplied on unit.
Compare actual supply power with motor nameplate
recommendations. Contact power company for adjustments.
Check that fan rotates freely.
Check across AC line. Correct voltage if possible.
Check motor bracket screws.
Check fan position on shaft.
Check for loose connections. Determine adequacy of main power
supply.
Check across AC line and correct voltage loss if possible.
Replace with larger sized wiring.
Reduce load or replace with a larger motor.
Remove fan cover, clean fan and replace cover.
Tighten motor mounting bolts.
Remove interference in motor fan housing.
Check fan operating condition.
Inspect the water pumps and valves for proper operation and check
the lines for obstructions.
Adjust the chiller or boiler to provide the proper water temperature.
Verify coil piping (see "Piping and Connections," p.
Clean the fin surface.
Verify glycol mixture and adjust if necessary.
53.)
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