Mitsubishi Electric PUMY-P125VMA1 Technical & Service Manual page 84

Multi-distribution piping on outdoor unit
Connection Examples
(Connecting up to Five Indoor Units)
*If multi-distribution piping on outdoor unit is
done, a maximum of 5 indoor units can be
connected.
Permissible Total Piping Length
Length
Farthest Piping Length
High/Low Difference in
Permissible
Indoor/Outdoor Section
High/Low
High/Low Difference in
Difference
Indoor/Indoor Section
Selecting the Refrigerant Branch Kit
Select Each Section of Refrigerant Piping
• 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.
Additional refrigerant charge
• 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.
A
B
a
C
1
Cannot redistribute the piping.
a+b+c+d+e is 100 meters or less
(L)
e is 30 meters or less
30 meters or less (20 meters or less if the outdoor unit is below.)
(H)
12 meters or less
(h)
Use multi-distribution piping on outdoor unit kit CMY-S65 ( 5 branches).
*Cannot be connected with 100,125 type indoor units.
• Refrigerant Piping Diameter In Section From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
Model number Piping Diameter (mm)
Liquid Line
40 or lower
Gas Line
Liquid Line
50 to 80
Gas Line
<Additional Charge>
Additional Liquid pipe size
refrigerant charge Total length of
{9.52
=
(kg) (m)
<Example>
Indoor 1 : 20 a : {6.35
2 : 20 b : {6.35
3 : 20 c : {6.35
4 : 50 d : {9.52
5 : 50 e : {9.52
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
84
L
b
c d
e
C
2
C C
3 4
C
5
{6.35
{12.7
{9.52
{15.88
Liquid pipe size
Total length of
0.06 {6.35 0.024
+
0.06 (kg/m) (m) 0.024 (kg/m)
10m
20m
20m
20m
30m
0.06 + 50 0.024 – 3.0 = 1.2kg (rounded up)
A Outdoor Unit
B First Branch
C Indoor unit
Refrigerant
amount for outdoor
unit
–
125: 3.0kg