Troubleshooting - Trane CGCN Installation Operation & Maintenance

Troubleshooting

In this section you will find a list of the most common problems that may cause the chiller unit to stop or
malfunction. Possible remedies are shown alongside a description of easily identifiable remedies.
WARNING! Extreme care should be taken when performing work or repairs on the unit: overconfidence can
result in injuries, even serious ones, to inexpert individuals. Operations marked with the letter "U" can be
performed directly by the user, who must carefully follow the instructions provided in this manual.
U = User
S = Specialized personnel only
Once the cause has been identified, you are advised to contact a Trane service center or a qualified technician for
help.
SYMPTOM Cooling
A The unit X
does not
start X
X
X
X
X
X
X
X
X
B The X
compressor
X
does not
start
X
X
C The X
compressor
X
starts up and
X
stops
repeatedly
X
Heating Who can take
corrective
action
X S
X S
X U
X S
X U
X U
X S
X S
X S
S
X
X S
X S
X S
X S
X S
X S
X U
X
S
Probable cause
Faulty connection or open
contacts
Lack of external consents
Anti-recycle timer active
Probe faulty service
Lack of consent of the service
thermostat
Lack of consent of the frost
protection thermostat
Frost sensor defective
Tripped breaker general
Lack of consent of the high or low
pressure
Defective compressor
Compressor burnt or seized
Compressor contactor de-
energized
Power circuit open
Motor thermal protection open
Intervention of the minimum
Compressor contactor defective
Calibration values of the set-point
or incorrect differential
Lack of coolant
Possible remedy
Check the voltage and close contacts
Check the operation of the water pump,
the pressure switch, vent the system;
Wait 5 minutes for the timer gives
consent
Check and replace if necessary
Plant in temperature, lack of demand;
verify calibration
Check water temperature Check the
calibration of the anti-
Check the operation
Check if there are any short circuits in
the wiring or in the windings of the
motors of pump, fan, compressor, and
the transformer.
See points D-E
See point B
Replace the compressor
Check the voltage across the coil of the
compressor contactor and the continuity
of the coil
Investigate the cause of the protection,
and check if there are any short circuits
in the wiring or in the windings of the
motors of pump, fan, compressor and
transformer
The compressor has operated in critical
condition or there is a lack of charge in
the circuit: Make sure that working
conditions are within the limits of
operation. Loss of coolant: see section G
See point E
Check and replace if necessary
Modify them as reported in the tables.
See point G