55 © STULZ SpA . – all rights reserved EN/39B/06.2018
SAL
7. Start-up
7.1. Commissioning
Before performing initial start-up, install and connect the system as described in the "Installation"
chapter.
• Make sure that the general switch is turned off and that the system is not live.
• Check that all the power switches and control fuses in the electrical system are off.
• Check that the power cable and terminals, including the PE terminals, are correctly connected.
• Check the contactors move freely.
• Switch on the conditioner with the general switch.
• Enable the control fuses one by one and the fan and compressor power switches.
• Check the input voltage on all the phases and on the direct current circuit.
• When starting up for the first time or after a long period, if the conditioner has remained inactive in
environments with temperatures below 0°C, preheat the compressor sump for 34 hours.
• At this point the electronic board is powered and individual components can be enabled to check
they work properly. The main operations that can be performed during installation are described in
the controller manual.
• Set the required return air temperature on the conditioner display.
• Press the ONOFF button on the display to start the air conditioner.
7.2. Checks after commissioning
• After about 20 minutes, check the sight glass for air bubbles. If there are, some refrigerant may
have leaked. Check the circuit for leaks, repair them and fill the circuit with R407C according to
the quantities indicated on the technical name-plate.
• Check that the level of the oil in the compressor is correct. The oil level must be between the lower
quarter and half-way up the inspection window.
• Check the current absorption of the compressors and fans and compare them with the values
indicated in the technical data.
• Check the electrical absorption of all the components.
• Check the direction of rotation of the compressor, as indicated in the paragraph "6.4. Electrical
Connections". If it's incorrect, invert the wires.
• Once the system is working at full power:
1. Check that no alarms have occurred;
2. Check that the air discharged from the condenser flows correctly without being drawn into the
cooling unit;
3. Check that the fans work properly;
4. Check, while the unit is running, that the supply voltage remains within the values indicated on
the technical name-plate;
5. Check that the unit works according to the set logic.
7.3. Switching off
To switch off the unit, turn off all the power supplies.
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