Blue Box SIGMA 2002, Installation, Installation, Operating, Operating, And Maintenance Manual

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- Verify that the heaters are working correctly. After the warm up period the crankcase must be warm to the
touch and be at a temperature of at least 10 to 15 °C higher than the ambient temperature.
- Check that all hydraulic connections are correctly installed and all indications on the unit labels are observed.
- Check that the hydraulic system has been vented to eliminate any air remaining. Fill the system gradually and
open the vent devices on the higher sections. The installer must provide a correctly sized expansion device.
5. START-UP
5.1 PRELIMINARY CHECKS
- Check that the electrical connections have been made correctly, and that all terminals are tight.
- Check that the voltage on the RST terminals is 400 V ± 5% (or the unit’s rated value, in the event of units
supplied to run on non-standard power supplies). If the mains voltage is subject to frequent fluctuations, consult
our Engineering Department to discuss the necessary protection systems.
- Check that the display shows the gas pressure in the refrigerant circuit (4-compressor models only).
- Inspect the unit for refrigerant leaks using a leak detector if necessary.
- Check that the crankcase heaters are correctly supplied with power.
Significant leakage of R407C refrigerant, in a gaseous state, will alter
the percentages of the remaining mixture with a consequent reduction in
performance.
The heaters must be connected at least 12 hours before starting the unit.
The heaters are automatically connected when the main disconnect switch
is set to the ON position.
Warning: before starting the unit check that all the enclosure panels are
in position and secured with the relative screws.