Rev. 3 02-2021
50
MTEC.DXi.H/DXi.HF.GB-3 Use and Maintenance technical manual DXi.H/DXi.HF English
Emibyte DXi.H/DXi.HF
Direct expansion close control
5. START UP
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Commissioning operations has to be performed following the previous mentioned indications.
Do not switch off the unit (temporary stop) using the main switch; this device has to be used only to disconnect the unit
when a current is absent, for example when the uniti s in OFF. Moreover, when the power supply is off the crankcase
heaters are not powered with consequent danger of compressor rupture when the unit will powered.
Before to start up the unit has to be necessary perform some electric, hydraulic and cooling checks.
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Malfunctions or damage can derivate also by lack of attention during shipping and installtion; before installing or
startig up the unit check about refrigerant leak presence caused by capillaries rupture or gauges connections,
cooling circuit pipes, transport vibrations, manumission or mistreatments on site.
• Check the right unit installation in accordance with advices in the present Manual;
• Check the electric connection and the terminal screw connections;
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• Check the unit ground connection;
• Check the refrigerant leaks, eventually using an apposite device;
• Check the oil leaks near the compressors or along the cooling circuit;
• Check the pressure of the cooling circuit using the gauges installed (if presents) or service gauges;
• Check the closing of all service outlets;
• Check the correct supply of the crankcase heaters (if presents);
• Check that all the hydraulic connection are performed correctly and that all the indications on the plates are respected;
• Check that the system has been properly vented;
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• Before to start up the unit check that every panel is in right position and well closed;
• Check the opening of all the circuit shut-off valve.
Do not modify any unit connection, otherwise the warranty immediately decay.
If present, the crankcase heaters must be switch on at least 12 hours before unit starts (preheating period) closing
the main switch (the heaters are automatically supplied when the switch is closed). The heaters are working correctly
if after few minutes the carte temperature will be 10/15°C higher than ambient temperature.
In case of crankcase heaters presence, during the preheating period is important to check if on the unit display is
present the word OFF or if the unit is in stand-by mode. In case of accidental start (before of preheating time) the
compressors could be seriously damaged and the warranty immediately decay.
