EN
1205. 6755517_02
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25.
25.1. PRELIMINARY OPERATIONS TO BE
MADE WITHOUT TENSION
check:
1. All safety conditions have been respected
2. The unit is correctly fixed to the support
surface
3. The minimum technical spaces have been
respected
4. That the power cables are generally of appro-
to earth.
5. All electric and hydraulic connections have
been tightened well.
25.2. THE FOLLOWING OPERATIONS ARE
PERFORMED WHEN THE UNIT IS
POWERED.
1. Supply power to the unit by turning the
master switch to the ON position. The display
will come on a few seconds after voltage has
been supplied.
2. Use a tester to check that the value of the po-
wer supply voltage to the RST phases is equal
between phases is no greater than 3%.
3. Check that the connections made by the
installer are in compliance with the documen-
tation.
4.
sump is working by measuring the increase in
temperature of the oil pan. The resistance/s
must function for at least 12 hours before
start-up of the compressor and in all cases the
temperature of the oil pan must be 10 -15°C
higher than the room temperature.
HYDRAULIC CIRCUIT
1. Check that all hydraulic connections are
made correctly, that the plate indications are
complied
2. Check that the hydraulic system is filled and
under pressure and also make sure that no air
is present; if so, bleed it.
SYSTEM LOAD:
Before starting the load, :
related terminals.
system load cock placed outside the machine.
vent valves,
It is advisable to repeat this operation once
the machine has worked for some hours and to
periodically check the system pressure, restoring
if it drops below 1 bar. Check the hydraulic seal of
the joints.
3.
system are correctly opened.
4. Make sure that the circulation pump is
operating and that the flow rate of the water
is sufficient to close the contact of the flow/
pressure switch.
5. Check lthe water flow rate, measuring the
pressure difference between input and output
of the evaporator and calculate the flow rate
using theevaporator pressure drop diagram
.
6. Check the correct functioning of the flow/
pressure switch if installed. Closing the cut-off
valve at the output of the heat exchanger; the
unit control panel must show the block. Finally
re-open thevalve and rearm the block.
25.3. MACHINE COMMISSIONING
After having performed all controls stated above, it
is possible to start the unit by pressing the ON key.
The display shows the temperature of the water and
machine functioning mode. Check the operating
After a few minutes, the unit will begin operating.
25.3.1.
COOLING CIRCUIT
CHECK:
- is lower than
the maximum indicated in the technical data
table.
- power supply,
the compressor noise level is not abnormal. If this
is the case, invert a phase.
-
and that unbalance between the three
3%.
-
pressure transducers and pressure switches.
-
Comparing the temperature read using a contact
thermostat positioned on the compressor intake
with the temperature shown on the low pressure
-
between these two temperatures gives the
overheating value. Optimal values are between 4
and 8°C
-
If the subcooling and overheating values are re-
gular the temperature measured in the pressing
line pipe at the outlet of the compressor must be
30/40°C above the condensation temperature.
CONTROL AND SAFETY DEVICES
CHECK:
That stops the compressor, generating the
respective alarm, when the delivery pressure
exceeds the setpoint value. The control of its
correct functioning can be performed by closing
and keeping the high pressure manometer under
control, check the intervention in corresponden-
ce of the calibration value. Caution: In the event
of failure to intervene at the calibration value,
stop the compressor immediately and check
the cause. The reset is manual and can only be
performed when the pressure falls below the
The anti-freeze control managed by the electronic
regulation and by the temperature probe located
at the outlet of the evaporator is to prevent the
formation of ice when the water flow rate is
too low. Correct operation can be checked by pro-
gressively increasingly the anti-freeze set-point
until it passes the outlet water temperature and
keeping the water temperature controlled with a
high precision thermometer, verify that the unit is
off and generates the respective alarm. After this
operation, take the anti-freeze set-point back to
its original value.
ATTENTION
Before carrying out the controls
indicated below, make sure that
the unit is disconnected from the
power mains. Make sure that the
master switch is locked in the
OFF position and an appropriate
sign is affixed. Before starting the
operations, check that there is no
voltage present using a voltmeter
or a phase indicator.
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