Mitsubishi PUMY-P100YHM Technical & Service Manual page 79

Method of Combined Branching of Lines and
Headers
Connection Examples
(Connecting to 5 Indoor Units)
Total Piping Length
Permissible
Farthest Piping Length
Length
Farthest Piping Length After First Branch
Permissible High/ High/Low Difference in Indoor/Outdoor Section
Low Difference
High/Low Difference in Indoor/Indoor Section
■
Selecting the Refrigerant Branch Kit
■
Select Each Section of Refrigerant Piping
(1) Section From Outdoor Unit
to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d,e)
(3) Section From Branch to
Branch (B,C)
Select the size from the table to the right.
■
Additional refrigerant charge
• Refrigerant of 3kg equivalent to 50m 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 the procedure shown
on the right.
• If the calculated additional refrigerant charge
is a negative amount, do not charge with any
refrigerant.
A
A
B
A+B+C+a+b+c+d+e is 120 meters or less
(L)
A+B+b is 80 meters or less
( )
B+b is 30 meters or less
(H)
30 meters or less (If the outdoor unit is lower, 20 meters or less)
(h)
12 meters 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.)
Branch Joint
CMY-Y62-G-E
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch (Out-
door Unit Piping Diameter)
Model
Each
Section of
PUMY-P100~140
Piping
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Liquid Line (mm)
9.52
<Additional Charge>
Additional
refrigerant charge
<Example>
Indoor 1 : 50
2 : 40
3 : 32
4 : 20
5 : 20
The total length of each liquid line is as follows;
9.52 : A + B + C + a = 10 + 20 +10 + 5 = 45m
6.35 : b + c + d + e = 10 + 5 + 5 + 5 = 25m
<Calculation example>
Additional
refrigerant charge = 45
79
Note: Pipe re-branching after the header branching
is not possible.
C
c d
3 4
B
D D
L
b
a
C
D
1
Branch Header (4 branches)
CMY-Y64-G-E
Piping Diameter (mm)
Liquid Line 9.52
Gas Line 15.88
Gas Line (mm)
15.88
Liquid pipe size Liquid pipe size
Total length of Total length of
9.52 × 0.06
= +
(kg) (m) × 0.06 (kg/m)
A : 9.52 10m a : 9.52
B : 9.52 20m b : 6.35
C : 9.52 10m c : 6.35
d : 6.35
e : 6.35
0.06 + 25 0.024 – 3.0 = 0.3kg (rounded up)
× ×
Note: The total of downstream unit models in the
table is the total of models as seen from point
A in the figure above.
E
A
G
e
5
D
A Outdoor unit
B First branching (branching
joint)
C Branching joint
D Indoor unit
2
D E Branching header
F To downstream unit
G Blind caps
Branch Header (8 branches)
CMY-Y68-G-E
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit (Indoor Unit
Piping Diameter)
Model number Piping Diameter (mm)
Liquid Line
50 or lower
Gas Line
Liquid Line
63 to 140
Gas Line
Refrigerant
amount for outdoor
6.35 × 0.024 unit
–
(m) × 0.024 (kg/m)
125: 3.0kg
5m
10m
At the conditions
5m
below:
5m
5m
F
6.35
12.7
9.52
15.88