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Multi-distribution piping on outdoor unit
Connection Examples
(Connecting up to Five Indoor Units)
Cannot redistribute the piping.
Liquid Line
Gas Line
Liquid Line
Gas Line
Piping Diameter (mm)
Model number
40 or lower
50 to 80
{
6.35
{
12.7
{
9.52
{
15.88
Outdoor Unit
First Branch
Indoor unit
A
B
C
a+b+c+d+e is 100 meters or less
e is 30 meters or less
30 meters or less (20 meters or less if the outdoor unit is below.)
12 meters or less
Use multi-distribution piping on outdoor unit kit CMY-S65 ( 5 branches).
*Cannot be connected with 100,125 type indoor units.
Total Piping Length
Farthest Piping Length
High/Low Difference in Indoor/Outdoor Section
High/Low Difference in Indoor/Indoor Section
Permissible
Length
Permissible High/
Low Difference
(L)
(H)
(h)
■
Selecting the Refrigerant Branch Kit
■
Additional refrigerant charge
•
Section the piping size for each section from
the branch to the indoor unit (a,b,c,d,e) using
the chart on the right.
*If multi-distribution piping on outdoor unit is
done, a maximum of 5 indoor units can be
connected.
• Refrigerant Piping Diameter In Section From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
• Refrigerant of 3kg equivalent to 50-m total
extended piping length is already included
when the outdoor unit is shipped.
Thus, if the total extended piping length is
50m or less, there is no need to charge with
additional refrigerant.
• If the total extended piping length exceeds
50m, calculate the required additional
refrigerant charge using theprocedure shown
on the right.
• If the calculated additional refrigerant charge
is a negative amount, do not charge with any
refrigerant.
<Additional Charge>
<Example>
Indoor 1 : 20
a :
{
6.35
10m
2 : 20
b :
{
6.35
20m
3 : 20
c :
{
6.35
20m
4 : 50
d :
{
9.52
20m
5 : 50
e :
{
9.52
30m
The total length of each liquid line is as follows
{
9.52 : d + e = 20 + 30 = 50m
{
6.35 : a + b + c = 10 + 20 + 20 = 50m
Therefore,
Additional refrigerant charge = 50
✕
0.06 + 50
✕
0.024 – 3.0 = 1.2kg (rounded up)
Additional
refrigerant charge
(kg)
Liquid pipe size
Total length of
{
9.52
✕
0.06
(m)
✕
0.06 (kg/m)
=
Liquid pipe size
Total length of
{
6.35
✕
0.024
(m)
✕
0.024 (kg/m)
+
Refrigerant
amount for outdoor
unit
125: 3.0kg
–
■
Select Each Section of Refrigerant Piping
a
C
C
1
b
C
2
c
C
3
d
e
C
4
5
H
L
h
A
B
OC272A--3.qxp 03.9.4 11:10 AM Page 78
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