Mitsubishi Electric CITY MULTI PUHY-P-YMF-B Installation Manual page 14

Multiple Line/Header
Connection Example
(When Connecting Five Indoor Units)
Total Piping Length
Permissible
Farthest Piping Length
Length
Farthest Piping Length After First Branch (r)
Permissible High/ High/Low Difference in Indoor/Outdoor Section (H)
Low Difference
High/Low Difference in Indoor/Indoor Section (h)
Selecting the Refrigerant Branch Kit
Use the table to the right to make the selection
based on the model total of indoor units down-
stream from the branch section or on the number
of indoor units to be connected on the header
branch.
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
At the time of shipping, the outdoor unit PUHY-
P400 is charged with 16 kg of refrigerant and the
PUHY-P500 is charged with 22 kg. 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 refriger-
ant 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 calculat-
ing the amount of additional charging and
charge the system according.
• If the calculation results of the calculation re-
sult 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 14.32 kg, round the
result up to 14.4 kg.
14
A
B
A+B+C+a+b+c+d+e is 220 m or less
A+B+b is 100 m or less
(L)
B+b is 30 m or less
50 m or less (If the outdoor unit is lower, 40 m or less)
15 m or less
Select the branch kit, sold separately, from the table below. (Each kit contains a refrigerant and
gas piping set.)
Line branching
Total of units downstream
Total of units downstream
less than 160
CMY-Y102S-F CMY-Y102L-F CMY-Y202-F
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch (Out-
door Unit Piping Diameter)
Model
Each
Liquid Line
Section of
PUHY-P400
Piping
Liquid Line
PUHY-P500
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Downstream Unit
Model Total
80 or less
81 to 160
161 to 330
331 to 480
481 or more
<Additional Charge>
Liquid pipe size
Total length of
ø15.88 × 0.25
(m) × 0.25 (kg/m)
<Example>
Indoor 1 : 125 A : ø15.88 30 m
2 : 100 B : ø12.7
3 : 40 C : ø12.7
4 : 32
5 : 32
The total length of each liquid line is as follows:
ø15.88 : A = 30 m
ø12.7 : B + C = 10 + 15 = 25 m
ø9.52 : a + b = 10 + 20 = 30 m
ø6.35 : c + d + e = 10 + 10 + 10 = 30 m
Therefore,
<Calculation example>
Additional
refrigerant charge = 30 × 0.25 + 15 × 0.12 + 30 × 0.06
A
C
c d
3 4
B
D D
L
R
b
2
a
C
D
D
1
4 branching
Total of units downstream
161 to 330 more than 331
CMY-Y104-E
(2) Refrigerant Piping Diameter In Section
Piping Diameter (mm) Model number
ø15.88
Gas Line ø31.75
ø15.88
50 · 63 · 71 · 80
Gas Line ø38.1
100 · 125 · 140
Liquid Line Gas Line
(mm) (mm)
ø9.52 ø15.88
ø12.7 ø19.05
ø12.7 ø25.4
ø15.88 ø31.75
ø15.88 ø38.1
Liquid pipe size Liquid pipe size
Total length of Total length of
ø12.7 × 0.12 ø9.52 × 0.06
+ +
(m) × 0.12 (kg/m) (m) × 0.06 (kg/m)
a : ø9.52
10 m b : ø9.52
15 m c : ø6.35
d : ø6.35
e : ø6.35
+ 30 × 0.024 + 2.5 = 14.4 kg
Note:
• Branch piping cannot be used
again after the header branch.
• The model total for down-
stream units shown in the ta-
ble below is the model total
E
when viewed from Point A in
the drawing above.
F
A Outdoor Unit
e
B First Branch (Branch Joint)
5
The first branch must be the
D
CMY-Y202-F when the out-
door unit and header branch
are to be used.
C Branch Joint
D Indoor Unit
E Branch Header
F Cap
Header branching
7 branching 10 branching
header header
CMY-Y107-E CMY-Y1010-E
From Branch to Indoor Unit (Indoor Unit
Piping Diameter)
Piping dia. (mm)
Liquid Line
25 · 32 · 40
Gas Line
Liquid Line
Gas Line
Liquid Line
Gas Line
Liquid Line
200
Gas Line
Liquid Line
250
Gas Line
Liquid pipe size
Total length of
ø6.35 × 0.024
+
(m) × 0.024 (kg/m)
10 m
20 m
At the conditions
10 m
below:
10 m
10 m
Value of α
Total capacity of
connecting indoor units
to Model 80
Models 81 to 160
Models 161 to 330
Models 331 to 480
Models 481 or more
header
ø6.35
ø12.7
ø9.52
ø15.88
ø9.52
ø19.05
ø12.7
ø25.4
ø12.7
ø28.58
+ α
α
1.0 kg
1.5 kg
2.0 kg
2.5 kg
3.0 kg