38
• Check the additional amount of refrigerant.
<Check list>
Calculate the additional amount of refrigerant from the additional amount of refrigerant (A) by the pipe diameter
at liquid side and the pipe length to be connected and the corrective amount of refrigerant (C) by the system
HP.
Additional amount
=
Real liquid
×
Additional amount of
+
Corrective amount of
of refrigerant pipe length refrigerant per liquid pipe 1m refrigerant by system HP
(A) (C)
Firstly enter the total length for each liquid pipe in the following table, and then calculate the additional amount of
refrigerant by pipe length.
<Additional amount of refrigerant by pipe length>
Next, refer to the following table for the corrective amount of refrigerant (C) by system HP.
<Corrective amount of refrigerant by system HP>
Pipe dia at
liquid side
Ø6.4
Ø9.5
Ø12.7
Ø15.9
Ø19.1
Ø22.2
Standard amount of refrigerant
kg/m
0.025 ×
0.055 ×
0.105 ×
0.160 ×
0.250 ×
0.3505 ×
Total pipe length at each liquid side
=
=
=
=
=
=
Additional amount of refrigerant by pipe
length (A)
Additional amount of refrigerant pipe
dia at each liquid side kg
Kg
Kg
Kg
Kg
Kg
Kg
Kg
System horse
power HP
5
6
8
10
12
14
16
18
20
22
22
24
24
26
Normal type
Unit Unit Unit Unit
1234
5
6
8
10
12
86
88
10 8
10 10
886
12 10
888
12 12
10 8 8
Corrective amount
of refrigerant (C) kg
0
0
1.5
2.5
3.5
0
0
0
3.0
0
5.0
–4.0
7.0
–4.0
System horse
power HP
28
30
32
32
34
34
36
36
38
40
42
44
46
48
Normal type
Unit Unit Unit Unit
1234
10 10 8
10 10 10
8888
12 10 10
10888
12 12 10
10 10 8 8
12 12 12
10 10 10 8
10 10 10 10
12 10 10 10
12 12 10 10
12 12 12 10
12 12 12 12
Corrective amount
of refrigerant (C) kg
–2.0
0
–6.0
1.0
–6.0
3.0
–6.0
4.0
–6.0
–5.0
–4.0
–2.0
0
2.0
Lastly add the additional amount of refrigerant by pipe length (A) to the corrective amount of refrigerant by
system HP (C). It is the final additional amount of refrigerant.
As the result, If minus sign is indicated, do not add the refrigerant (=0kg).
<Additional amount of refrigerant>
Additional amount of refrigerant by pipe length (A)
Corrective amount of refrigerant by system HP (C)
Additional amount of refrigerant (A) + (C)
kg
kg
kg
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