3. Piping Design
DATA U5
SYSTEM DESIGN
System H
3-3. Refrigerant charging calculation
(1) Calculation of additional refrigerant charge
Calculate the amount of additional charge based on the length of the piping extension and the size of the refrigerant
line.
Use the table to the below as a guide to calculating the amount of additional charging and charge the system
accordingly.
If the calculation results in a fraction of less than 0.1kg, round up to the next 0.1kg. For example, if the result of the
12.38kg, round the result up to 12.4kg.
At the time of shipping, the outdoor unit is charged with the refrigerant. As this charge does not include the amount needed
for extended piping, additional charging for each refrigerant line will be required on site. In order that future servicing may be
properly provided, always keep a record of the size and length of each refrigerant line and the amount of additional charge
by writing it in the space provided on the outdoor unit.
A
B C D
e
a b c d
Indoor 1: P48 A: 40 m a: 10 m
2: P36 B: 10 m b: 5 m
3: P15 15 m c: 10 m
4: P12 10 m d: 10 m
5: P24 e: 10 m
The total length of liquid pipe of each size is as follows:
Total capacity of connecting Indoor units Pt :
Pt = P48 + P36 + P15 + P12 + P24 = P135, therefore = 3.5kg
12.7 : A = 40 = 40 m
9.52 : B + C + D + a + b + e = 10 + 15 + 10 + 10 + 5 + 10 = 60 m
6.35 : c + d = 10 + 10 = 20 m
Example: PUHY-HP96THMU
P15P36P48 P12
P24
<Additional Charge>
= +++++
(kg)
(oz)
(m)
(ft.)
x 3.1 [oz/ft.]
(ft.)
x 2.15 [oz/ft.]
(ft.)
x 1.29 [oz/ft.]
(ft.)
x 0.65 [oz/ft.]
(ft.)
x 0.26 [oz/ft.]
x
0.29 (kg/m)
Additional
refrigerant charge
Total length of liquid
(m)
x
0.20 (kg/m)
Total length of liquid
(m)
x
0.12 (kg/m)
Total length of liquid
(m)
x
0.06 (kg/m)
Total length of liquid
(m)
x
0.024 (kg/m)
Total length of liquid
= + + + + + 124
++++
+ 124
(oz)
0 (ft.)
x
3.1 (oz/ft.)
Additional
refrigerant charge
=
0 0 131
x
1.29 193
x
0.65 64
x
0.26
= 436 [oz]
Total length of liquid
x 3.1 (oz/ft.)
0 (ft.)
x
2.15 (oz/ft.)
Total length of liquid
x 2.15 (oz/ft.)
131 (ft.)
x
1.29 (oz/ft.)
Total length of liquid
x 1.29 (oz/ft.)
193 (ft.)
x
0.65 (oz/ft.)
Total length of liquid
x 0.65 (oz/ft.)
64 (ft.)
x
0.26 (oz/ft.)
Total length of liquid
x 0.26 (oz/ft.)
= + + + + + 3.5
++++
+ 3.5
(kg)
0 (m)
x
0.29 (kg/m)
Additional
refrigerant charge
=
0 0 40
x
0.12 60
x
0.06 20
x
0.024
= 12.4 kg
Total length of liquid
x 0.29 (kg/m)
0 (m)
x
0.20 (kg/m)
Total length of liquid
x 0.20 (kg/m)
40 (m)
x
0.12 (kg/m)
Total length of liquid
x 0.12 (kg/m)
60 (m)
x
0.06 (kg/m)
Total length of liquid
x 0.06 (kg/m)
20 (m)
x
0.024 (kg/m)
Total length of liquid
x 0.024 (kg/m)
Table3-2-3-1. Value of
Total capacity of connecting indoor units
2.0 kg [71 oz]
m [kg]
m [kg]
ft. [oz]
ft. [oz]
or
Models 27
2.5 kg [89 oz]
3.0 kg [106 oz]
3.5 kg [124 oz]
4.5 kg [159 oz]
6.0 kg [212 oz]
5.0 kg [177 oz]
Indoor 1: P48 A: 131ft. 32ft.
2: P36 B: 32ft. b: 16ft.
3: P15 C: 49ft. c: 32ft.
4: P12 D: 32ft. d: 32ft.
5: P24 e: 32ft.
The total length of liquid pipe of each line is as follows:
Total capacity of connecting Indoor units Pt :
Pt = P48 + P36 + P15 + P12 + P24 = P135, therefore = 124oz
A = 131 = 131ft.
+ a + b + e = 32 + 49 + 32 + 32 + 16 + 32 = 193ft.
If the calculation results in a fraction of less than 1oz, round up to the next 1oz. For example, if the result of the
calculation was 435.1oz, round the result up to 436oz.
Models 28 54
Models 55 126
Models 127 144
Models 145 180
Models 181 234
Models 235
calculation was
4 - 93
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