37
RG66001206 - Rev 03
MCA
È severamente vietata la riproduzione anche parziale di questo manuale / All copying, even partial, of this manual is strictly forbidden
11
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.
Operations marked with the letter "S" may be performed exclusively by specialised personnel.
Once the cause has been identified, you are advised to contact a Galletti service centre or a qualified technician for help.
SYMPTOM
A
The unit does not
start
B
The compressor
does not start
C
The compressor
starts up and
stops repeatedly
Cooling
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Heating
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Who can take
corrective action
U
= User
S
= specialised
personnel
S
S
U
S
U
U
S
S
S
S
S
S
S
S
S
S
U
S
Possible control
panel indication
EU
EO
E1
A1
E2
L1
H1
L1
Probable cause
Faulty connection or contacts open
Wrong voltage
Not enabled by remote controls
Anti-recycle timer active
Service thermostat sensor defective
Not enabled by service thermostat.
Not enabled by antifreeze thermostat
Antifreeze sensor defective
Tripping of main circuit breaker
Not enabled by high or low pressure switch
Compressor defective
Compressor burnout or seizure
Compressor contactor deenergized
Power circuit open
Motor thermal protection open
Minimum pressure switch has tripped
Compressor contactor defective
Wrong set-point or differential setting
Lack of refrigerant
Possible remedy
Check the voltage and close the
contacts
Check the efficiency of the water
circulation pump, pressure switch,
bleed air from the circuit; check
whether contacts 16 and 30 on the
terminal board are closed
Wait 5 minutes until the timer enables
operation
Check and replace if necessary
System at the set temperature, no
demand; check the setting
Check the water temperature
Checking the antifreeze setting
Check whether it is functioning
properly
Check for the presence of short
circuits in the wiring or windings of the
pump, fan and compressor motors or
in the transformer.
See items D-E
See item B
Replace the compressor
Check the voltage at either end of the
compressor contactor coil and verify
the continuity of the coil itself
Locate the cause that tripped the
protection; check for the presence of
short circuits in the wiring or windings
of the pump, fan and compressor
motors or in the transformer
The compressor has operated in critical
conditions or there is insufficient
refrigerant within the circuit: check
the working conditions and make sure
they fall within the operating limits.
Refrigerant leak: refer to item G
See item E
Check and replace if necessary
Change them according to the
indications given in the tables.
See item G.
