Troubleshooting - Trane Flex II Series Installation Operation & Maintenance

16 TROUBLESHOOTING

Coolin
Symptom
g
x
A The unit does
not start x
x
x
x
B The
x
compressor
does not start
x
x
C The
compressor
x
starts up and
stops
x
repeatedly
x
x
x
D The
x
compressor
does not start
x
because the
maximum
pressure switch
has tripped
x
x
Who can take
corrective action
U = User
S = specialised
personnel
s
s
s
s
s
s
s
s
s
u
s
s
s
u
s
s
x
s
s
Probable cause
Probe faulty service
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 differential
Lack of coolant
Pressure switch out of order
Overcharge of refrigerant
Finned coil clogged, air flow
rate is too low
Fan not working
Water pump circulation blocked
Water circulation pump and
defective
Presence of non condensable
gases in the refrigerant circuit
Refrigerant filter clogged
Possible remedy
Check and replace if necessary.
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 in the
tables.
See point G
Check and replace.
Download the excess refrigerant
Remove dirt from the coil and
obstructions to the air flow
See point F.
Unblock the pump.
Check and replace if necessary.
Prime the circuit after it has been
downloaded and put under vacuum.
Check and replace.
40