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Translation from original instructions
7 COMMISSIONING
7.1 Preliminary operations
Make sure the main disconnect switch is in the OFF position.
In units with pumps, their power supply is mechanically locked.
Restore functional conditions only on starting.
If the pumps of the unit are not locked, electrically isolate them by operating the protective devices, to pre-
vent automatic starting, in the event of antifreeze function activation, during the preliminary operations.
Restore functional conditions only on starting.
To avoid damage to the mechanical seals, do not start the circulation pump before completely filling the
system with water.
If a pump has to be replaced, after replacing it, make sure the valves are open and the pump is full of water
before enabling its operation.
Before filling the hydraulic system, check that the drain valve is closed and that all the air valves are open.
Open the shut-off devices of the system and start to fill it by slowly opening the water filling valve.
When water begins to come out through the air valves, close them and continue filling until the pressure value envisaged
for the system is reached.
The unit should only be started up by qualified personnel authorised by the manufacturer.
All the units are pre-charged with refrigerant gas, so the refrigerant circuit is pressurised.
Check:
- that the electrical connection has been made correctly and that all terminals are properly tightened;
- that the voltage on the RST terminals is 400 V ± 10% (or the rated voltage of the unit if there are special voltages). If the
voltage fluctuates frequently, contact our technical department to choose suitable protective devices;
- that the gas pressure in the refrigerant circuits is shown on the pressure gauges (if present) or on the control display;
- that there are no refrigerant fluid leaks, using a leak detector if necessary (the presence of oil stains may be a sign of
refrigerant leaks).
Be careful with the electrical checks and use only suitable tools.
Position the master switch of the unit to ON and check on the display of the control that the unit is OFF in order to prevent
it from starting.
If present, check that the crankcase heaters are powered correctly.
The crankcase heaters are switched on when the main disconnect switch is closed and this must be done at
least 12 hours before starting the unit.
To check that the heaters are working correctly, check that the lower part of the compressors is hot and in any case at a
temperature of 10 - 15 °C above ambient temperature.
