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The sizing of the refrigerant lines connecting the outdoor condensing unit and the indoor evaporating unit is of primary
importance. For connections to our units, see the table below, where for the lengths specified, the diameter of the fittings
corresponds to the diameter to be used for the connection pipes.
For greater distances, the diameter must be calculated (see corresponding bibliographies or our bulletin SIZING THE
REFRIGERANT LINES IN SPLIT SYSTEMS). The table below also describes the recommended maximum difference in height
for standard pipes, in both the case where the condensing unit is lower than the terminal unit, and vice-versa.
Only use copper pipes for refrigeration.
Intake
Liquid
Size
dia.
dia.
81
28
18
91
28
18
101
35
22
121
35
22
SUCTION&DISCHARGE PIPES
This piping may be considered alternately the SUCTION line (cooling operation)
and DISCHARGE line (heating operation).
For all sizes, the fittings are welded; the unit is supplied as standard with special
ROTALOCK connections.
Connect the intake line using two spanners, as shown in Figure 1.
LIQUID PIPES
As per the intake line, all the fittings are welded; as standard they are supplied with
special ROTALOCK connections.
Always make the connections using two spanners (Fig. 2).
NOTE:
If pipe flanging equipment is available, the coupling flanges can be made directly onto the line, without use the length of pipe
supplied as standard, to save welding and as a consequence limit the amount of impurities inside the pipes.
All the pipes must be perfectly clean (clean using nitrogen or dry air before connecting the pipes to the two units) and free of
moisture for optimal emptying.
REFRIGERANT PIPES
Max.
Max.
Max difference in height
length m
no. curves
28
6
27
6
28
9
27
9
Fig. 4
Fig. 6 (1)
20
20
20
20
20
20
20
20
61
1) When operating in heating, the
reascent of liquid causes a rise in the
condensing pressure.
Figure 1
Figure 2
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