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10.2. Refrigerant piping system
Line-branch method
Connection examples
(connecting to six indoor units)
Item
Total piping length
Indoor
Farthest piping length
side
Farthest piping length after first branch (r)
Oil balance pipe
Outdoor
side
Distributer (liquid)/Variable capacity unit, Constant capacity unit
Distributer (gas)/Constant capacity unit
Indoor/Outdoor
Permissible high/
Indoor/Indoor
Low difference
Variable capacity unit/Constant capacity unit
Selecting the refrigerant branch kit
Use the table to the right to make the selection based
on the model total of indoor units downstream from the
branch section.
Select each section of refrigerant piping
(1) Section from outdoor unit to first
branch (C)
(2) Sections from branch to indoor
unit (a, b, c, d, e, f)
(3) Section from branch to branch
(D, E, F, G)
Select the size from the table to the right.
Variable capacity unit Constant capacity unit
400
500
200
16
22
6.5
Additional refrigerant charge
The outdoor unit is charged with refrigerant at the time of
shipping according to the chart above. 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.
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 right as guide to calculating the amount
of additional charging and charge the system according.
• If the calculation results in a fraction of less than 0.1 kg,
round up to the next 0.1 kg. For example, if the result of the
calculation was 23.28 kg, round the result up to 23.3 kg.
• If the total amount of refrigerant including the amount
of refrigerant sealed in the outdoor unit when shipped
from the factor plus additional refrigerant for exten-
sion piping exceeds 73 kg, use 73 kg as the total
amount of refrigerant.
Amount of refrigerant when shipped from factory +
added refrigerant
73 kg
=
Constant
Variable
capacity unit
capacity unit
A
G
B
Note 1
Distributer
(liquid)
Distributer
(gas)
C
a
First branch
Indoor
unit
1
Note 1: Because it is built into the variable capacity unit, B is used to carry liquid only. Set the constant capacity unit and
variable capacity unit in accordance with the G dimension given in the figure above (G = 0.01 m).
Piping components
A+B+C+D+E+F+G+a+b+c+d+e+f
(L)
A (B)+C+D+E+F+G+f
A, B (Liquid line)
Outdoor upper
Outdoor lower
Select the branch kit, sold separately, from the table below. (Each kit contains a refrigerant and gas piping set.)
Downstream unit model total
160 or less
161 to 330
331 to 630
631 or more
(1) Refrigerant piping diameter in section from out-
door unit to first branch (outdoor unit piping diam-
eter)
Each section
Model
of piping
PUHY-600YSMC
PUHY-650YSMC
PUHY-700YSMC
PUHY-750YSMC
(3) Refrigerant piping diameter in section from branch
to branch
Downstream unit model total
80 or less
81 to 160
(kg)
161 to 330
331 to 480
250
481 to 630
8.5
631 or more
<Additional charge>
Liquid pipe size
total length of
ø19.05
0.29
+
(m)
0.29 (kg/m)
<Example> Indoor 1 : 125
The total length of each liquid line is as follows
ø19.05 : C = 40 m
ø15.88 : B + D + E = 1 + 10 + 5 = 16 m
ø12.7
: A + F + G = 3 + 5 + 5 = 13 m
ø9.52
: a + b + c + d + e = 50 m
ø6.35
: f = 5 = 5 m
Therefore,
<Calculation example>
Additional
refrigerant charge = 40
Constant
capacity unit
Oil balance pipe (optional) I
(for distribution within the unit)
Gas line A
Liquid line A
Gas line (main) C
L
R
D
E
F
G
b
c
d
e
Indoor
Indoor
Indoor
Indoor
unit
unit
unit
unit
Indoor
2
3
4
5
D+E+F+G+f
The included oil balance pipe must be used. If any other piping is used, the length
I
of the oil balance pipe must be no more than 3 m (max. equivalent length 4 m),
and height from the bottom of the unit must be no more than 0.1 m.
A (Gas line)
H
H
h
–
Must be installed on same frame, and there must be no high/low difference.
Branch kit model
CMY-Y102S-F
CMY-Y102L-F
CMY-Y202-F
CMY-Y302-F
Piping diameter (mm)
Liquid line
Gas line
ø19.05
ø38.1
ø19.05
ø44.45
ø19.05
ø44.45
ø19.05
ø44.45
Liquid line (mm)
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
ø19.05
Liquid pipe size
Liquid pipe size
total length of
total length of
ø15.88
0.25
ø12.7
0.12
+
(m)
0.25 (kg/m)
(m)
0.12 (kg/m)
A : ø12.7
3 m
2 : 125
B : ø15.88
1 m
3 : 125
C : ø19.05
40 m
4 : 125
D : ø15.88
10 m
5 : 100
E : ø15.88
5 m
6 : 40
F : ø12.7
5 m
G : ø12.7
5 m
0.29 +16
0.25 + 13
0.12 +
50
0.06 + 5
0.024 + 3.0 = 23.3 kg
Variable
capacity unit
Distributer (gas) (optional)
Gas line B
Liquid line B
Distributer (liguid) (optional)
Liquid line (main) C
:indicates piping connection points
To down stream units
A
f
Note:
• The model total for downstream units shown
in the table below is the model total when
viewed from Point A in the drawing above.
unit
6
• With the exception of PUHY-600YMC, the
first branch is always CMY-Y302-F.
Tolerance
220 m or less
100 m or less (Max. equivalent length 125 m)
40 m or less
4 m or less (Max. equivalent length 5 m)
4 m or less (Max. equivalent length 5 m)
50 m or less
40 m or less
15 m or less
(2) Refrigerant piping diameter in section from branch
to indoor unit (indoor unit piping diameter)
Model number
Piping diameter (mm)
Liquid line
20 · 25 · 32 · 40
Gas line
Liquid line
50 · 63 · 71 · 80
Gas line
Liquid line
100 · 125
Gas line
Gas line (mm)
ø15.88
ø19.05
ø25.4
ø31.75
ø38.1
ø44.45
Liquid pipe size
Liquid pipe size
total length of
total length of
ø9.52
0.06
ø6.35
0.024
+
+
(m)
0.06 (kg/m)
(m) 0.024 (kg/m)
a :ø9.52
15 m
b :ø9.52
15 m
c :ø9.52
10 m
At the conditions
d :ø9.52
5 m
below:
e :ø9.52
5 m
f :ø6.35
5 m
Value of
Total capacity of
connecting indoor units
to Model 80
Models 81 to 160
Models 161 to 330
Models 331 to 480
Models 481 to 630
Models 631 or more
ø6.35
ø12.7
ø9.52
ø15.88
ø9.52
ø19.05
+
1.0 kg
1.5 kg
2.0 kg
2.5 kg
3.0 kg
4.0 kg
13
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