Rev. B 08-2017
35
MTEC.4680.GB-B-1 Operation and maintenance manual GH serie English
GH
Dehumidi
fi
ers for radiant cooling system
7.4 Refrigerant circuit repair
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
fi
nder. In case bubbles appear discharge the circuit before welding with proper alloys.
In the case that refrigerant circuit should be discharged, all the refrigerant must be recovered with proper machi-
nes
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 speci
fi
ed 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 re
fi
gerant 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 speci
fi
ed 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
•
fi
lter for acid.
When under vacuum do not switch on the compressor.
•
7.3.2 End of seasons or unit switched off:
If you plan to stop the unit for a long period, the hydraulic circuit must be fully emptied, so that there is no more water in the pipes and in
the heat exchanger. This step is mandatory if during the seasonal stop, it is expected that the ambient temperature falls below the freezing
point of the mixture used (typical seasonal operation ).
All decommissioning operations must be performed by authorized personnel in accordance with the national legisla-
tion in force in the country where the unit is located.
8.1 Disconnect the unit
8. DECOMMISSIONING
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.
