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We reserve the right to make changes without any prior notice.
Translation from original instructions
7.2 First starting
When the unit is started for the first time, some important tests and checks must be done.
7.2.1 Hydraulic tests
So that the unit can operate, the external OK signal device must be closed (refer to the wiring diagram provided with the
unit).
The external OK signal input must be short-circuited if not needed for system requirements.
Water circulation can be managed by the control of the unit or by a control outside the unit.
If water circulation is controlled by an external control, the pump must be started before the unit starts and
stopped after the unit stops.
We advise an advance on starting and a delay on stopping of at least 5 minutes.
Before starting the unit, make sure the system has been bled correctly.
If the control for water circulation in the source system is present in the electrical control panel of the unit, the starting of the
pump takes place with the starting of the first compressor.
If the control for water circulation in the source system is not present in the electrical control panel of the unit, make sure
there is water circulation in the source system with the starting of the first compressor.
Check the pumps are rotating in the correct direction.
Start the unit by acting on the user interface of the control.
Check that the water flow switch/differential pressure switch is working correctly by closing the shut-off valve at the outlet of
the unit; this should cause the alarm to be displayed on the user interface of the unit.
If not, restore correct operation.
Reopen the valve, reset the alarm and restart the unit.
For units equipped with pump unit, if the pump is noisy, close the delivery valve until normal operation has been restored.
This can occur when the head loss of the system differs considerably from the discharge head of the pump.
7.2.1.1
Hydraulic tests for FC/NG units
The starting of source-side water circulation is controlled by the controller according to the operating conditions.
This can take place with user circuit demand if in free cooling operation condition or with starting of the first compressor.
The pump speed also depends on the operating conditions.
This can be modulating during condensation control or at full flow rate.
The dry cooler fans start after the source-side pump, and their speed depends on the source-side water temperature ac-
cording to the operating conditions.
