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7.3.2 End of seasons or unit switched off:
If one is planning not to use the unit for a long period, the hydraulic circuit must be emptied, so that there is more water in the pipes and in the heat ex-
changer. This operation is mandatory if, during the seasonal downtime, it is expected that the ambient temperature will fall below the freezing point of the
mixture used (typical seasonal operation).
7.4 Refrigerant circuit repair
In the case that refrigerant circuit should be discharged, all the refrigerant must be recovered with proper machines
The system must be charged with nitrogen, using a gas bottle with a pressure reducing valve, until 15 bar pressure is reached. Any eventual leakage must
be searched with a bubble leak finder. In case bubbles appear discharge the circuit before welding with proper alloys.
Never use oxygen instead of nitrogen: explosions may occur.
Site assembled refrigerant circuits must be assembled and maintained carefully, in order to prevent malfunctions.
Therefore:
•
Avoid oil replenishment with products that are different from that specified and that are pre-loaded into the compressor.
•
In the event of a gas leakage on machines using refrigerant R134A, R410A even if it is only a partial leak, do not top up. The entire charge must be
recovered, the leak repaired and a new refigerant charge weighed in to the circuit.
•
When replacing any part of the refrigerant circuit, do not leave it exposed for more than 15 minutes.
•
It is important when replacing a compressor that the task be completed within the time specified above after removing the rubber sealing caps.
•
When replacing the compressor following a burn out, it is advisable to wash the cooling system with appropriate products including a filter for acid.
•
When under vacuum do not switch on the compressor.
8. DECOMMISSIONING
8.1 Disconnect the unit
All decommissioning operations must be performed by authorized personnel in accordance with the national legislation in force
in the country where the unit is located.
•
Avoid spills or leaks into the environment.
•
Before disconnecting the machine please recover:
•
the refrigerant gas;
•
Glycol mixture in the hydraulic circuit;
•
the compressor lubricating oil.
Before decommissioning the machine can be stored outdoors, providing that it has the electrical box, refrigerant circuit and hydraulic circuit intact and
closed.
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