39
INSTALLATION OPERATIONS AND MAINTENANCE MANUAL - RXC/Hi SERIES
17. STARTUP
17.1 Preliminary checks
It is necessary to carry out preliminary checks on the electrical, refrigeration and hydraulic parts before starting the unit.
Perform the commissioning operations in accordance with all the requirements of the previous paragraphs.
Malfunctions or damage may also result from lack of proper care during shipment and installation. It is good
practice to check before installation or commissioning that there are no damages due to tampering, vibration
during transport, mistreatment suffered on site.
• Check that the machine is installed in a state of the art manner and in accordance with the instructions in this manual.
• Check electrical connection and correct fastening of all terminals.
• Check that the voltage is as indicated on the unit's rating plate.
• Check that the unit is connected to the earth system.
• Check that no gas leakages are present, if necessary with a gas-leak detector.
• Check that no oil leaks are present, which might be indicating leakages.
• Check that the refrigerant circuit is in pressure: use manometers, if available, or service manometers.
• Check that all service outlets are closed with the appropriate caps.
• Check that the hydraulic connections have been installed correctly and that all indications on the nameplate are respected.
• Check that the system has been properly vented.
• Check that fluid temperatures are within operating limits.
• Before turning the unit on, check that all closing panels are in place and secured with the appropriate screws.
Do not modify the internal electrical connections as this will immediately invalidate the warranty.
If present, the electric heaters for the compressors must be turned on at least 12 hours before the start-up
(pre-heating phase), shutting down the main switch (the heaters are fed automatically when the switch is OFF).
The heaters operate correctly if, after a few minutes, the crankcase temperature of the compressor is 10÷15°C
higher than the air temperature.
In case of presence of electric heaters for the compressors, during the 12 hours of pre-heating phase, it is
important to check on the display whether the OFF indication is present or that the unit is in stand-by mode.
In case of accidental start, before this 12-hour pre-heating time has elapsed, the compressors might seriously
be damaged and the warranty would decay immediately.
