Diagnostics And Troubleshooting; Fan Coil And Cabinet Heater - Trane UniTrane 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.
Hazardous Service Procedures!
The maintenance and troubleshooting procedures recommended in this 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. 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. Failure to follow all of the recommended safety warnings provided, could result in death or
serious injury.

Fan Coil and Cabinet Heater

Table 62. Fan coil and cabinet heater troubleshooting recommendations
Symptom Probable Cause
Blown fuse or open circuit breaker
Overload trip
Improper wiring or connections
Motor fails to start
Improper current supply
Mechanical failure
Motor stalls Low line voltage
Poor fan alignment
Excessive vibration
Shipping spacers not removed
Motor runs and
Partial loss of line voltage
then dies down
Motor does not Low voltage at motor terminals
come up to speed Line wiring to motor too small
Overloaded motor
Motor overheats
Motor fan is clogged with dirt preventing proper
ventilation
Motor mounting bolts loose
Excessive motor
Rigid coupling connections
noise
Fan rubbing on fan cover
Incorrect airflow
Incorrect water flow
Low water coil
Incorrect water temperature
capacity
Coil is piped incorrectly
Dirty fin surface
Incorrect glycol mixture
Incorrect airflow
Coil is piped incorrectly
Incorrect steam pressure
Low steam coil
Excessive steam superheat
capacity
Failure of steam line/condensate return components Verify component operation
Boiler failure
Dirty fin surface
Plugged drain line
Drain pan is
Unit not level
overflowing
Improper trap design
Improper trap design
Standing water in
Unit not level
drain pan
Plugged drain line
Coil face velocity too high
Improper trap design
Wet interior
Drain pan leaks/overflows
Condensation on surfaces
130
WARNING
Recommended Action
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 adjustments.
Check that fan rotates freely.
Check across AC line. Correct voltage if possible.
Check motor bracket screws.
Check fan position on shaft.
Align bearing set screws. Loosen and retighten bearing set screws.
Remove shipping spacers and/or bolts.
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.
Replace with flexible connections.
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 "Coil Piping and Connections," p.
Clean the fin surface.
Verify glycol mixture and adjust if necessary.
Check fan operating condition.
Verify coil piping (see "Coil Piping and Connections," p.
Verify steam pressure and adjust if necessary.
Check steam superheat.
Steam superheat should not exceed 50ºF.
Verify boiler operation
Clean the fin surface.
Clean drain line
Level unit
Design trap per unit installation instructions
Design trap per unit installation instructions
Level unit
Clean drain line
Reduce fan speed
Design trap per unit installation instructions
Repair leaks
Insulate surfaces
53).
53).
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