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19 COMMISIONING - WARNINGS
START-UP
Operations to be performed with no voltage present
WARNING the unit is not working.
Check:
— All safety conditions have been respected;
— The unit is correctly fixed to the support surface;
— The minimum technical spaces have been respected
— That the main power supply cables have appropriate cross-section, which can
support the total consumption of the unit. (see electric data sections) and that
the unit has been duly connected to the ground;
— That all the electrical connections have been made correctly and all the termi-
nals adequately tightened;
— Check that the connections made by the installer are in compliance with the
documentation;
— Check for refrigerant gas leaks, especially near the pressure points of pressure
gauges, pressure transducers and pressure switches (vibrations during trans-
port may have loosened the connections).
Operations to be performed with no voltage present
WARNING the unit is not working.
— Supply power to the unit by turning the master switch to the "ON" position
— Use a tester to verify that the value of the power supply voltage to the phases
is equal to 400V ± 10%; also verify that the unbalance between phases is no
greater than 3%;
— Check that the connections made by the installer are in compliance with the
documentation;
— Verify that the resistor of the compressor 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 any event, the temperature of
the oil pan must be 50.0-59.0 °F higher than room temperature.
Hydraulic circuit controls
— Check that all hydraulic connections are made correctly, that the plate indica-
tions are complied with and that a mechanical filter has been installed in each
inlet heat exchanger. (Mandatory component for warranty to be valid);
Check that the circulation pump(s) are working, and that the wa-
ter flow rate is sufficient to close the flow switch contact if installed,
. We recommend installing one always upstream of every heat exchanger.
— Check the water flow rate, measuring the pressure difference between inlet and
outlet of the evaporator and calculate the flow rate using the evaporator pres-
sure drop tables present in this manual;
— Check the correct functioning of the flow meters 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 the valve and rearm the block.
Commisioning
Once all the aforementioned checks have been carried out, the unit
can be commissioned.
— Close the door of the electrical panel;
— Set the unit main switch to ON, the unit will start after a few minutes.
Operations to be performed with machine on
WARNING the unit is working.
If it is necessary to carry out measures or controls that require the machine to be
operating, the following is necessary:
— Make sure that any remote control systems are disconnected; however, keep
in mind that the PLC on the machine controls its functions and can enable and
disable the components creating hazardous situations (e.g. power and rotate
the fans and their mechanical drive systems).
— Control of the water flow rate alarm, the unit provides for the management of a
flow rate alarm controlled by a differential pressure switch or flow switch if pro-
vided. This type of safety device intervenes after the first 30 seconds of pump
functioning, if the water flow rate is not sufficient. The intervention stops the
compressor and the pump itself.
— The antifreeze set temperature can only be changed by an authorised service
centre and only after checking that there is a suitable % of antifreeze solution in
the hydraulic circuit. If this alarm goes off, call the authorised technical service
Summary of Contents for NLC 0280H
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