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INSTALLATION OPERATIONS AND MAINTENANCE MANUAL - RXC/Hi SERIES
21.3 Periodical checks
Commissioning operations must be carried out in accordance with all the requirements of the previous para-
graphs.
All operations performed on the unit must be carried out by qualified personnel in compliance with the nation-
al legislation in force in the country of destination.
Every 6 months
It is good practice to carry out periodic checks to ensure that the unit, control and safety devices are functioning correctly.
• Check that the electric terminals inside the compressor terminal plates are correctly fixed.
• Periodically clean the mobile and fixed contacts of the contactors.
• Check that there are no water leakages in the hydraulic circuit.
• Check that the flow switch operates properly, clean the metallic filter installed in the water pipe.
• Check that the crankcase heaters are supplied and operate properly (on a monthly basis).
• Check the condition of the finned coils, if necessary clean with compressed air in the opposite direction to the air flow.
If the coil is completely clogged, clean it with a low-pressure cleaner, taking care not to damage the aluminium fins.
• Check the attachment and balance of the fans.
Unit shutdown
In case of long period shutdown, the hydraulic circuit must be drained so that there is no more water in the pipes and the
exchanger.
This operation is compulsory if, during the shutdown period, the ambient temperature can fall below the freezingpoint of the
mixture used (typical seasonal operation).
21.4 Refrigeration circuit repair
Please remember that, in case it is necessary to discharge the refrigerant circuit, it will be mandatory to recu-
perate all of the refrigerant gas by suitable machinery.
The system must be charged with nitrogen using a tank equipped with reducer, up to a pressure of approx. 15 bar. Leakages, if
any, must be detected with a leakage detector. The formation of bubbles or foam indicates the presence of localised leakages.
In this case, it will be necessary to discharge the circuit before carrying out the weldings with suitable alloys.
Never use oxygen instead of nitrogen: elevate explosion risk.
Refrigerant circuits operating with refrigerant gas require specific care in mounting and maintenance operations, in order to
prevent them from operation anomalities.
