Galletti MPI DC 10 Installation, use and maintenance manual - Mpi Dc
MPI DC
28
All copying, even partial, of this manual is strictly forbidden
RG66007706 - Rev 00
12 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 in-
expert 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
star ts up and stops
repeatedly
Cooling
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
s
u
u
s
s
s
s
s
s
s
s
u
s
s
s
s
Possible control panel
indication
Digital input alarm
alarm falty probe -
evaporator water inlet
temperature
antifreeze alarm circuit 1
alarm falty probe - evaporator
water inlet temperature
loW pressure alarm circuit 1
HIGH pressure alarm circuit 1
Inverter alarm
Possible faulty pump
Possible faulty pump
loW pressure alarm
circuit 1
Probable cause
Faulty connection or contacts open
Wrong voltage
not enabled by remote controls
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
Water circulation pump blocked
Water circulation pump defective
Minimum pressure switch has tripped
Compressor contactor defective
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
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
Release the pump
Check the pump and replace it if necessary.
See item E
Check and replace if necessary
See item g.