Header-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Liquid Line
Gas Line
Piping Diameter (mm [inch])Model
W9.52 [3/8]
W19.05 [3/4]
Liquid Line
Gas Line
Liquid Line
Gas Line
Liquid Line
Gas Line
Piping Diameter (mm [inch])
Model number
18 or lower
24 to 54
72
W6.35 [1/4]
W12.7 [1/2]
W9.52 [3/8]
W15.88 [5/8]
W9.52 [3/8]
W19.05 [3/4]
Outdoor Unit
First Branch
Indoor unit
A
B
C
A+a+b+c+d 150m [492 ft]
A+d 80m [262 ft]
d is 30 meters[100 ft] or less
50 meters [164 ft] or less (If the outdoor unit is lower, 40 meters [131 ft] or less)
15 meters [49 ft] or less
Please select branching kit, which is sold separately, from the table below.
(The kit comprises sets for use with liquid pipes and for use with gas pipes.)
Total Piping Length
Farthest Piping Length
Farthest Piping Length After First Branch
High/Low Difference in Indoor/Outdoor Section
High/Low Difference in Indoor/Indoor Section
Permissible
Length
Permissible High/
Low Difference
(L)
(1)
(H)
(h)
■
Select Each Section of Refrigerant Piping
■
Selecting the Refrigerant Branch Kit
Select the size from the right table.
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch (Out-
door Unit Piping Diameter)
(1) Section From Outdoor Unit
to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d)
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit (Indoor Unit
Piping Diameter)
<Additional Charge>
<Calculation example>
Outdoor model : P60
Indoor
1 : P24 A : W9.52 [3/8"] 30 m [98ft] a : W9.52 [3/8"] 15m [49ft]
2 : P15 b : W6.35 [1/4"] 10m [33 ft]
3 : P08 c : W6.35 [1/4"] 10m [33 ft]
4 : P06 d : W6.35 [1/4"] 20m [66 ft]
The total length of each liquid line is as follows;
W9.52 : A + a = 30 m + 15 m = 45 m [98 ft + 49 ft = 147 ft]
W6.35 : b + c + d = 10 m + 10 m + 20 m = 40 m [33 ft + 33 ft + 66 ft = 132 ft]
Additional
refrigerant charge
(kg)
[lbs]
Liquid pipe size
Total length of
W9.52
×
0.07 kg
[3/8"
×
0.047 lbs]
(m)
×
0.07 (kg/m),
[ft]
×
0.047 [lbs/ft]
=
Liquid pipe size
Total length of
W6.35
×
0.027 kg
[1/4"
×
0.018 lbs]
(m)
×
0.027 (kg/m),
[ft]
×
0.018 [lbs/ft]
+
At the
conditions
below:
Branch header (4 branches)
CMY-Y64-G-E
Branch header (8 branches)
CMY-Y68-G-E
PUMY-P60
A
a
b
c
1
d
H
h
L
N
+
The total capacity of connected indoor units is as follows:
24 + 15 + 08 + 06 = 53
Therefore, the additional refrigerant
charge is as follows = 45 m × 0.07 kg + 40 m × 0.027 kg + 2.5 kg = 6.8 kg (rounded up)
= [147 ft × 0.047 lbs + 132 ft × 0.018 lbs + 5.5 lbs = 14.8 lbs]
Total capacity of
connected indoor
units
Amount for the
indoor units
~P42
2.0kg [4.4lbs]
P43 ~ P60
2.5kg [5.5lbs]
P61~
3.0kg [6.6lbs]
■ Additional refrigerant charge
■ Calculation of additional refrigerant charge
Refrigerant for the extended piping is not
included in the outdoor unit when the unit is
shipped from the factory.
Therefore, charge each refrigerant piping
system with additional refrigerant at the
installation site. In addition, in order to carry out
service, enter the size and length of each liquid
pipe and additional refrigerant charge amounts
in the spaces provided on the “Refrigerant
amount” plate on the outdoor unit.
• Calculate the additional charge using the
liquid pipe size and length of the extended
piping.
• Calculate the additional refrigerant charge
using the procedure shown to the right, and
charge with the additional refrigerant.
• For amounts less than 0.1 kg, round up the
calculated additional refrigerant charge.
(For example, if the calculated charge is
32.92 kg, round up the charge to 33.0 kg.)
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