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Translation from original instructions
6.7 Refrigeration connections
For the "LE" (motocondensing) versions and the "LE/HP" (reversible motocondensing) versions, the refrigerant connections
must be made between the unit and the remote exchanger.
The "LE" and "LE/HP" version units are "dry run" tested, and the refrigerant circuit is charged at the factory with a mixture
of nitrogen and helium at a pressure of about 10 bar.
Check that the unit is pressurised as this will confirm that the refrigerant circuit has not been damaged in
transit.
The following operations require pressurised pipes and brazed connections to be made, and these must
be carried out by skilled staff with the necessary qualifications in accordance with current regulations.
6.7.1 Piping implementation
In order to lay the pipes, use copper pipes, of a size suitable for the cooling capacity and the distance to be covered and of
an adequate thickness for the maximum design pressure and the type of refrigerant used.
The route of the pipes must be as short and straight as possible, making sure the following basic rules are complied with:
- use the fewest number of bends possible, preferably as wide as possible;
-
make a slight slope in the suction line (1%) in the horizontal sections so that the oil is carried more easily in the instal
-
lations of cold only units "LE". For the installation of reversible units "LE/HP", the horizontal sections of the suction/
delivery line must not slope at all;
-
fit suitable syphons every 4 metres, in the vertical riser sections of the suction pipe (suction/delivery for reversible units
"LE/HP");
- support the horizontal and vertical lines with suitable vibration dampers;
-
insulate the suction line (suction/delivery for reversible units "LE/HP") with insulating material that is at least 9 mm thick;
- solder the joints, avoiding butt welds by using sleeves or enlarging the tubes;
-
adequately protect the various components such as valves or taps fitted nearby, e.g. by wrapping them with wet rags,
during braze-welding;
- once the junctions have been completed, blow-clean the tubes to remove any dirt;
- press the plant to search for any leaks.
The maximum height difference between the unit and the remote exchanger is 15 equivalent metres for any type of instal
-
lation.
The recommended diameters for equivalent lengths up to 30 m are given below.
