Blue Box SIGMA 2002 - Refrigerant Connections; Procedures to Follow When Sizing Refrigerant Lines

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4.9 CONNECTIONS FOR VERSION LE (MOTOCONDENSING) AND LC (MOTOEVAPORATING)
4.9.1 Refrigerant connections
Version LE units (motocondensing) and LE (motoevaporating) must be connected with refrigerant pipelines.
4.9.2 Route of pipes and maximum distance between sections
For units types with separate sections, the route followed by refrigerant lines depends on the location of the
sections and the characteristics of the surrounding building structure.
Pipe runs should be as short as possible to limit the pressure drop and the refrigerant charge volume. The
maximum permissible pipeline length is 30 metres.
If this limits cannot be adhered to contact Blue Box for further information.
4.9.3 Procedures to follow when sizing refrigerant lines
Depending on the relative position of the sections, there are certain procedures to follow when installing the
refrigerant line.
The diameter of pipes for versions LE and LC can be obtained from tables 1, 2 and 3, according to the selected
model and length of connecting pipes.
4.9.4 Version LE: evaporating section at lower level than condensing section:
a) The vertical riser must be equipped with siphons at least every 6 metres to facilitate the return of oil to the
compressor;
b) Make a collection pit on the suction line downstream of the thermostatic valve bulb;
c) Horizontal sections of the suction line should follow a grade of at least 1% to facilitate oil return to the
compressor (see above).
Figure 11