CO
2
NNEXT
rev.01
EN
90 / 293
4.4.2.
Refrigerating connection
ATTENTION: The pipes must be sized according to the type and extension of the system in full
compliance with the safety restrictions imposed by the laws of the country of installation. The
Manufacturer is not responsible for the incorrect selection and execution of the system pipes.
ATTENTION: The pipes may have different dimensions from that of the partly-completed machine
connection. Use appropriate reduction to allow connection.
The partly-completed machine must be connected to the following components to complete the entire system:
x
TN positive evaporators;
x
LV negative evaporators (if any);
the connections are as follows:
x
liquid
x
MT suction
x
LT suction (if any)
Near each connection is shown the relative label (1) with the type indicated, while the information regarding
the diameter is shown in the refrigerator diagram attached to this manual.
The dimensions of the outlet pipes (intake line and liquid line) shown in the refrigeration diagram are
calculated for a MAXIMUM TUBING LENGTH of 30 m.
This maximum length, valid for each individual section of both intake and liquid, has been defined in order to
obtain a pressure drop that does not compromise correct functioning of the evaporator.
Furthermore, the following functional requirements must be satisfied:
x
the liquid line must be created in such a way that the refrigerant speed is between 0.6 and 1.2m/s
and that the pressure drops are contained. It is advisable not to exceed 50kPa;
x
the liquid line must be insulated with a suitable thickness and not less than 13 mm for medium
temperature machines and 19mm for low temperature machines;
x
the intake line from positive (if present) and/or negative (if present) users must be created in such a
way that guarantees correct oil return to the partly-completed machine and to reduce pressure
drops. It is advisable not to exceed 50kPa;
x
the intake lines must be insulated with a suitable thickness and be not less than 19mm.
