Manual code 75803707A.0708
Page 26 of 64
4.7.8 COMPLETION OF THE REFRIGERANT CHARGE
• Direct expansion air conditioners are shipped pressurised with a nitrogen charge.
• Air-cooled condensers are shipped pressurised with a nitrogen charge.
• Machines with internal water-cooled condensers are supplied fully charged with refrigerant
To charge the refrigerant circuit/s of a machine, it is necessary to consider that the total quantity of refrigerant
required for a direct expansion unit equipped with remote condenser is determined by the summing the refrigerant
contents of each individual component in the circuit. The refrigerant contents of the individual components are given in
the following table.
Compressor
Size
Rated power (Hp) Rated power (kW)
Contents of refrigerant circuit (kg)
21
2 6 0,4
31
3 10 0,5
41
3,5 11 0,5
51
5 15 0,5
71
6,5 19 0,8
81
7,5 25 1,0
101
10 30 1,2
131
12 36 1,6
151
15 45 1,9
72
2 × 3,5
25 2 x 0.5
102
2 × 5
30 2 x 0.5
142
2 × 6,5
42 2 x 0.8
162
2 × 7,5
45 2 x 1.0
202
2 × 10
64 2 x 1.2
262
2 × 12
75 2 x 1.6
302
2 × 15
90 2 x 1.9
Refrigerant contents of the unit
Weight of refrigerant in the discharge and liquid lines:
Weight of refrigerant in kg per metre of pipe (R407C)
Diameters Ø 10/12 Ø 12/14 Ø 14/16 Ø 16/18 Ø 20/22 Ø 26/28
Liquid pipe
0,08 0,11 0,15 0,20 0,31 0,53
Discharge pipe
0,02 0,03 0,05 0,06 0,09 0,16
Diameters Equivalent metres (m)
Ø 12
0,50 0,25 0,75 2,10 1,90
Ø 14
0,53 0,26 0,80 2,20 2,00
Ø 16
0,55 0,27 0,85 2,40 2,10
Ø 18
0,60 0,30 0,95 2,70 2,40
Ø 22
0,70 0,35 1,10 3,20 2,80
Ø 28
0,80 0,45 1,30 4,00 3,30
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