Manual code 75803707A.0708
Page 25 of 64
4.7.7 DIAMETERS OF REFRIGERANT CIRCUIT CONNECTION PIPES
Use the following table to determine the recommended diameters for the supply and return pipes in accordance
with the machine size (given by the numerical sequence in the product code).
The values in the columns for pipe lengths up to 30m are also valid for longer lengths and do not need to be
increased. However, it is advisable to position the air conditioners so that the pipes are kept as short as possible, to
avoid significant loss of charge in the circuit and a consequent reduction in cooling capacity.
Compressor Pipes up to 15 mlong Pipes from 15 to 30 m long
Size
Rated power
(Hp)
Rated power
(kW)
Ø Discharge
(mm)
Ø Liquid
(mm)
Ø Discharge
(mm)
Ø Liquid (mm)
21
2 6 Ø 12/14 Ø 10/12 Ø 14/16 Ø 10/12
31
3 10 Ø 14/16 Ø 10/12 Ø 16/18 Ø 10/12
41
3,5 11 Ø 14/16 Ø 10/12 Ø 16/18 Ø 10/12
51
5 15 Ø 16/18 Ø 10/12 Ø 20/22 Ø 14/16
71
6,5 22 Ø 16/18 Ø 10/12 Ø 20/22 Ø 14/16
81
7,5 24 Ø 20/22 Ø 14/16 Ø 26/28 Ø 14/16
101
10 30 Ø 20/22 Ø 14/16 Ø 26/28 Ø 16/18
131
12 40 Ø 26/28 Ø 16/18 Ø 26/28 Ø 16/18
151
15 45 Ø 26/28 Ø 16/18 Ø 26/28 Ø 20/22
72
2 × 3,5
25
2 × Ø 14/16 2 × Ø 10/12 2 × Ø 16/18 2 × Ø 10/12
102
2 × 5
30
2 × Ø 16/18 2 × Ø 10/12 2 × Ø 20/22 2 × Ø 14/16
142
2 × 6,5
42
2 × Ø 16/18 2 × Ø 10/12 2 × Ø 20/22 2 × Ø 14/16
162
2 × 7,5
45
2 × Ø 20/22 2 × Ø 14/16 2 × Ø 26/28 2 × Ø 14/16
202
2 × 10
64
2 × Ø 20/22 2 × Ø 14/16 2 × Ø 26/28 2 × Ø 16/18
262
2 × 12
75
2 × Ø 26/28 2 × Ø 16/18 2 × Ø 26/28 2 × Ø 16/18
302
2 × 15
90
2 × Ø 26/28 2 × Ø 16/18 2 × Ø 26/28 2 × Ø 20/22
Inside/outside diameters of refrigerant pipes
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