Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet page 51

10
10-1. REFRIGERANT PIPING SYSTEM
ADDITIONAL REFRIGERANT CALCULATIONS (S SERIES) example
PUMY-P-V(Y)KM-A(-BS)
Line-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
ANT PIPING SYSTEM
Permissible
Units)
Length
Permissible High/
Low Difference
■
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)
(3) Section From Branch to
Branch (B,C)
Length A+B+C+a+b+c+d [ 300 m
(L) Select the size from the table to the right.
ng Length A+B+C+d [ 150 m
(R)
Length After First Branch B+C+d [ 30 m
(H)
ce in Indoor/Outdoor Section 50 meters or less (If the outdoor unit is lower, 40 meters or less)
(h)
nce in Indoor/Indoor Section 15 meters or less
erant Branch Kit
Use an optional branch piping kit (CMY-Y62-G-E).
of Refrigerant Piping
(1) Refrigerant Piping Diameter In Section
■
Additional refrigerant charge
From Outdoor Unit to First Branch
Refrigerant for the extended piping is not included in the
(Outdoor Unit Piping Diameter)
r Unit
outdoor unit when the unit is shipped from the factory.
Model
Therefore, charge each refrigerant piping system with
Each
h to PUMY-P112
additional refrigerant at the installation site. In addition, in
Section of
PUMY-P125
Piping
order to carry out service, enter the size and length of each
PUMY-P140
to
liquid pipe and additional refrigerant charge amounts in
the spaces provided on the "Refrigerant amount" plate on
table to the right.
the outdoor unit.
(3) Refrigerant Piping Diameter In Section
Calculation of additional refrigerant charge
From Branch to Branch
• Calculate the additional charge using the liquid pipe size
Liquid Line (mm)
and length of the extended piping and total capacity of
{9.52
connected indoor units.
• Calculate the additional refrigerant charge using the
t charge
<Additional Charge>
procedure shown to the right, and charge with the Calculation of refrigerant charge
ping is not included in the
additional refrigerant.
ipped from the factory.
Pipe size
Liquid pipe
• For amounts less than 0.1 kg, round up the calculated
ant piping system with
ø6.35
additional refrigerant charge.
allation site. In addition, in
(m) × 19.0 (g/m)
(For example, if the calculated charge is 6.01 kg, round up
the size and length of each
the charge to 6.1 kg.)
erant charge amounts in
Included refrigerant amount when shipped from the factory
frigerant amount" plate on
Included refrigerant amount: 4.8 kg
<Example>
gerant charge
Outdoor model : P125
ge using the liquid pipe size Indoor 1 : P63 (7.1 kW) A : ø9.52 30 m a : ø9.52 15 m
ping and total capacity of
OCH549
erant charge using the
The total length of each liquid line is as follows:
and charge with the ø9.52 : A + a = 30 + 15 = 45 m
ø6.35 : b + c + d = 10 + 10 + 20 = 40 m
The total capacity of connected indoor unit is as follows:
g, round up the calculated
7.1 + 4.5 + 2.8 + 2.2 = 16.6
<Calculation example>
d charge is 6.01 kg, round up
Additional refrigerant charge
40 ×
REFRIGERANT PIPING TASKS
A
A
Total Piping Length
Farthest Piping Length
(R)
Farthest Piping Length After First Branch
B C
High/Low Difference in Indoor/Outdoor Section
High/Low Difference in Indoor/Indoor Section
a b c
B
C
C C
Each
Section of
Piping
Piping Diameter (mm)
Liquid Line
{9.52
Gas Line
{15.88
Gas Line (mm)
{15.88
Total capacity of
Pipe size
connected indoor units
Liquid pipe
+ +
ø9.52
8.1 ~ 16.0 kW
(m) × 50.0 (g/m)
2 : P40 (4.5 kW) b : ø6.35 10 m
3 : P25 (2.8 kW) c : ø6.35 10 m
4 : P20 (2.2 kW) d : ø6.35 20 m
19.0 50.0
+ 45 × + 3.0 = 6.1 kg (rounded up)
1000 1000
A
A
B
a b
B
C
C
A+B+C+a+b+c+d [ 300 m
L
(L)
A+B+C+d [ 150 m
R
B+C+d [ 30 m
d
(H)
50 meters or less (If the outdoor unit is lower, 40 meters or less)
(h)
15 meters or less
Use an optional branch piping kit (CMY-Y62-G-E).
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
C
(Outdoor Unit Piping Diameter)
Model Piping Diameter (mm)
A Outdoor Unit
PUMY-P112
B First Branch Liquid Line
PUMY-P125
C Indoor unit
Gas Line
PUMY-P140
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Liquid Line (mm) Gas Line (mm)
{9.52 {15.88
(2) Refrigerant Piping Diameter In Section
<Additional Charge>
From Branch to Indoor Unit
Calculation of refrigerant charge
(Indoor Unit Piping Diameter)
Pipe size Pipe size
Model number
Piping Diameter (mm)
Liquid pipe Liquid pipe
+
Liquid Line
ø6.35 ø9.52
50 or lower
Gas Line
(m) × 19.0 (g/m) (m) × 50.0 (g/m)
Liquid Line
Included refrigerant amount when shipped from the factory 63 to 140
Gas Line
Included refrigerant amount: 4.8 kg
Note:
<Example>
When connecting the CONNECTION KIT
Outdoor model : P125
(PAC-LV11M-J) and an M-series indoor
Indoor 1 : P63 (7.1 kW) A : ø9.52 30 m a : ø9.52 15 m
unit, refer to the installation manual for the
2 : P40 (4.5 kW)
CONNECTION KIT when selecting the
3 : P25 (2.8 kW)
pipe size and piping length.
4 : P20 (2.2 kW)
The total length of each liquid line is as follows:
ø9.52 : A + a = 30 + 15 = 45 m
Amount for the
ø6.35 : b + c + d = 10 + 10 + 20 = 40 m
indoor units
The total capacity of connected indoor unit is as follows:
~ 8.0 kW 1.5 kg
7.1 + 4.5 + 2.8 + 2.2 = 16.6
<Calculation example>
2.5 kg
Additional refrigerant charge
16.1 kW ~ 3.0 kg
19.0 50.0
40 × + 45 ×
1000 1000
At the conditions 127
below:
L
R
d
C
c
C
C
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
Model number
{9.52
50 or lower
{15.88
63 to 140
Note:
When connecting the CONNECTION KIT
(PAC-LV11M-J) and an M-series indoor
unit, refer to the installation manual for the
CONNECTION KIT when selecting the
pipe size and piping length.
Total capacity of Amount for the
connected indoor units indoor units
+
~ 8.0 kW 1.5 kg
{6.35
8.1 ~ 16.0 kW 2.5 kg
{12.7
16.1 kW ~ 3.0 kg
{9.52
{15.88
b : ø6.35 10 m
At the conditions
c : ø6.35 10 m
below:
d : ø6.35 20 m
+ 3.0 = 6.1 kg (rounded up)
A Outdoor Unit
B First Branch
C Indoor unit
Piping Diameter (mm)
Liquid Line
{6.35
Gas Line
{12.7
Liquid Line
{9.52
Gas Line
{15.88
51