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• Check the additional amount of refrigerant.
Checklist 2
Calculate the additional amount of refrigerant from the additional amount of refrigerant (A) by the pipe diameter on
the liquid side, the pipe length to be connected, and the corrective amount of refrigerant (C) according to system
horsepower.
First, enter the total length for each liquid pipe diameter 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) according to system horsepower.
<Corrective amount of refrigerant according to system horsepower>
Lastly, add the additional amount of refrigerant by pipe length (A) to the corrective amount of refrigerant by
combined horsepower (C). This is the final additional amount of refrigerant.
If a minus sign is indicated as the result, do not add the refrigerant (= 0 kg).
<Additional amount of refrigerant>
Pipe diameter on the liquid
side
Standard amount of
refrigerant
kg/m
Total pipe length on each liquid side
m
Additional amount of refrigerant pipe diameter on
each liquid side
kg
Ø6.4
0.025 ×
=
kg
Ø9.5
0.055 ×
=
kg
Ø12.7
0.105 ×
=
kg
Ø15.9
0.160 ×
=
kg
Ø19.0
0.250 ×
=
kg
Ø22.2
0.350 ×
=
kg
Additional amount of refrigerant by pipe length (A)
kg
Combined HP (HP)
Combined outdoor units (HP)
C (Corrective amount of refrigerant) (kg)
Standard type
8
8HP
–
–
–
1.5
10
10HP
–
–
–
2.5
12
12HP
–
–
–
3.5
14
14HP
–
–
–
8.5
16
16HP
–
–
–
10.5
18
10HP
8HP
–
–
0.0
20
10HP
10HP
–
–
3.0
22
12HP
10HP
–
–
5.0
24
12HP
12HP
–
–
7.5
26
16HP
10HP
–
–
8.5
28
16HP
12HP
–
–
9.5
30
16HP
14HP
–
–
11.5
32
16HP
16HP
–
–
12.5
34
12HP
12HP
10HP
–
3.0
36
12HP
12HP
12HP
–
4.0
38
16HP
12HP
10HP
–
6.0
40
16HP
12HP
12HP
–
7.0
42
16HP
14HP
12HP
–
8.0
44
16HP
16HP
12HP
–
10.0
46
16HP
16HP
14HP
–
12.0
48
16HP
16HP
16HP
–
14.0
High Efficiency type
16
8HP
8HP
–
–
0.0
24
8HP
8HP
8HP
–
-4.0
26
10HP
8HP
8HP
–
-4.0
28
10HP
10HP
8HP
–
-2.0
30
10HP
10HP
10HP
–
0.0
32
8HP
8HP
8HP
8HP
-6.0
34
10HP
8HP
8HP
8HP
-6.0
36
10HP
10HP
8HP
8HP
-6.0
38
10HP
10HP
10HP
8HP
-6.0
40
10HP
10HP
10HP
10HP
-5.0
42
12HP
10HP
10HP
10HP
-4.0
44
12HP
12HP
10HP
10HP
-2.0
46
12HP
12HP
12HP
10HP
0.0
48
12HP
12HP
12HP
12HP
2.0
Additional amount of refrigerant by pipe length (A)
kg
Corrective amount of refrigerant according to combined horsepower (C)
kg
Additional amount of refrigerant
kg
Corrective amount of refrigerant
according to system horsepower
Additional amount
of refrigerant
=
(A)
(C)
+
Actual liquid pipe length × Additional amount
of refrigerant per 1 m of liquid pipe