34
Refrigerant amount
charged in factory
Pipe dia. at liquid side
Additional refrigerant amount/1m
5-16. Charging the System with Additional Refrigerant
After the system has been vacuumed, replace the vacuum pump with a refrigerant cylinder and charge the
system with additional refrigerant.
Calculating of additional refrigerant charge amount
Refrigerant in the system when shipped from the factory
When the system is charged with refrigerant at the factory, the amount of refrigerant needed for the pipes at the
site is not included. Calculate the additional amount needed, and add that amount to the system.
(Calculation)
Additional refrigerant charge amount is calculated from size of liquid pipe at site and its real length.
Additional refrigerant charge amount at site =
Real length of liquid pipe ×
Additional refrigerant charge amount
+ compensation by system HP (Table 2)
per liquid pipe 1m (Table 1)
Example : Additional charge amount R (kg) = (L1 x 0.025kg/m) + (L2 x 0.055kg/m) + (L3 x 0.105kg/m) + (3.0kg)
L1 : Real total length of liquid pipe Ø6.4 (m)
L2 : Real total length of liquid pipe Ø9.5 (m)
L3 : Real total length of liquid pipe Ø12.7 (m)
System : 20HP
R410A
5HP 6HP 8HP 10HP 12HP
8.5kg 8.5kg 12.5kg 12.5kg 12.5kg
8.0kg 8.0kg 11.0kg 11.0kg 11.0kg
Heat pump model
Cooling only model
Table 1
Table 2
Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0 Ø22.2
0.025kg 0.055kg 0.105kg 0.160kg 0.250kg 0.350kg
Combined
horse power
(HP)
5
6
8
10
12
14
16
18
20
22
24
26
Outdoor combination
(HP)
5
6
8
10
12
86
88
10 8
10 10
12 10
886
12 12
888
10 8 8
C
(Compensation)
(kg)
0.0
0.0
1.5
2.5
3.5
0.0
0.0
0.0
3.0
5.0
0.0
7.0
–4.0
–4.0
Combined
horse power
(HP)
28
30
32
34
36
38
40
42
44
46
48
Outdoor combination
(HP)
10 10 8
10 10 10
12 10 10
8888
12 12 10
10 8 8 8
12 12 12
10 10 8 8
10 10 10 8
10 10 10 10
12 10 10 10
12 12 10 10
12 12 12 10
12 12 12 12
C
(Compensation)
(kg)
–2.0
0.0
1.0
–6.0
3.0
–6.0
4.0
–6.0
–6.0
–5.0
–4.0
–2.0
0.0
2.0
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