Refrigerant Piping Tasks - Mitsubishi Electric PUMY-P200YKM2 Technical & Service Manual

10

REFRIGERANT PIPING TASKS

10-1. REFRIGERANT PIPING SYSTEM
Line-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Permissible Total Piping Length
Length
Farthest Piping Length
Farthest Piping Length
After First Branch
High/Low Difference in
Permissible
High/Low
Indoor/Outdoor Section
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)
(3) Section From Branch to
Branch (B,C)
Select the size from the table to the right.
■ Additional refrigerant charge
Refrigerant for the extended piping is not
included in the outdoor unit when the unit
is shipped from the factory.
Therefore, charge each refrigerant piping
system with additional refrigerant at the
installation site. In addition, in order to
carry out service, enter the size and
length of each liquid pipe and additional
refrigerant charge amounts in the spaces
provided on the "Refrigerant amount"
plate on the outdoor unit.
Calculation of additional refrigerant
charge
• Calculate the additional charge using the
liquid pipe size and length of the extended
piping and total capacity of connected
indoor units.
• Calculate the additional refrigerant charge
using the procedure shown to the right,
and charge with the additional refrigerant.
• For amounts less than 0.1 kg, round
up the calculated additional refrigerant
charge.
(For example, if the calculated charge is
6.01 kg, round up the charge to 6.1 kg.)
OCH675D
A
B
A+B+C+a+b+c+d [ 150 m
A+B+C+d [ 80 m
(L)
B+C+d [ 30 m
(R)
50 meters or less (If the outdoor unit is lower, 40 meters or less)
(H)
15 meters or less
(h)
Use an optional branch piping kit (CMY-Y62-G-E).
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch(Outdoor
Unit Piping Diameter)
Model
Each
Liquid pipe
Section of
L [ 60m
Piping
L > 60m
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Total capacity
of indoor units
L [ 60m
Up to16.0kW
L > 60m
L [ 60m
16.1 to 29.1kW
L > 60m
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.
<Additional Charge>
Calculation of refrigerant charge
Pipe size
Liquid pipe
ø6.35 mm
+
(m) × 19.0 (g/m)
*When connecting 4 PEFY-P·VMA3 indoor units, use 3.5kg regardless of the amount indicated in
the preceding table according to the total capacity.
Included refrigerant amount when shipped from the factory
Included refrigerant amount: 7.3 Kg
<Example>
Outdoor model: P200
Indoor 1: P125 (14.0 kW)
2: P40 (4.5 kW)
3: P25 (2.8 kW)
4: P20 (2.2 kW)
The total length of each liquid line is as follows:
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:
14.0 + 4.5 + 2.8 + 2.2 = 23.5
<Calculation example>
Additional refrigerant charge
121
A
L
R
d
B C
a b c
C
C C
(2) Refrigerant Piping Diameter In Section
Piping Diameter (mm) Model number
Gas pipe
ø9.52
ø19.05
ø12.7
Liquid pipe Gas pipe
(mm) (mm)
ø9.52
ø15.88
ø12.7
ø9.52
ø19.05
ø12.7
Pipe size Pipe size
Liquid pipe Liquid pipe
ø9.52 mm ø12.7 mm
+
(m) × 50.0 (g/m) (m) × 92.0 (g/m)
A : ø9.52 mm 30 m
a : ø9.52 mm 15 m
b : ø6.35 mm 10 m
c : ø6.35 mm 10 m
d : ø6.35 mm 20 m
19.0 50.0
40 × + 45 ×
1000 1000
A Outdoor Unit
B First Branch
C
C Indoor unit
From Branch to Indoor Unit (Indoor Unit
Piping Diameter)
Piping Diameter (mm)
Liquid Line
50 or lower
Gas Line
Liquid Line
63 to 140
Gas Line
Liquid Line
200
Gas Line
Total capacity of Amount for the
connected indoor units indoor units*
up to 16.0 kW
+
16.1 to 25.0 kW
25.1 to 29.1 kW
At the conditions
below:
+ 3.0 = 6.1kg (rounded up)
ø6.35
ø12.7
ø9.52
ø15.88
ø9.52
ø19.05
2.5 kg
3.0 kg
3.5 kg