40 22.11 5806712_07
14 COMMISIONING WARNINGS
STARTUP
NOTICE: Aermec cannot be held responsible for any malfunction of the
units which are due to errors during commissioning.
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 xed 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 lter 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 ow rate is sucient to close the ow switch contact if installed,
. We recommend installing one always upstream of every heat exchanger.
— Check the water ow rate, measuring the pressure dierence between inlet and
outlet of the evaporator and calculate the ow rate using the evaporator pres-
sure drop tables present in this manual;
— Check the correct functioning of the ow meters if installed. Closing the cut-o
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 ow rate alarm, the unit provides for the management of a
ow rate alarm controlled by a dierential pressure switch or ow switch if pro-
vided. This type of safety device intervenes after the rst 30 seconds of pump
functioning, if the water ow rate is not sucient. 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 o, call the authorised technical service
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