Mitsubishi Electric CITY MULTI, Техническое и сервисное руководство

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141
OCH673D
10 REFRIGERANT PIPING TASKS
10-1. REFRIGERANT PIPING SYSTEM
Line-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
B
A
A
H
B C
L
R
d
a
h
b c
C
C
C C
Outdoor Unit
First Branch
Indoor unit A
B
C
Permissible
Length
Total Piping Length A+B+C+a+b+c+d
[
300 m
Farthest Piping Length (L) A+B+C+d
[
150 m
Farthest Piping Length
After First Branch
(
R
) B+C+d
[
30 m
Permissible
High/Low
Difference
High/Low Difference in
Indoor/Outdoor Section
(H)
The outdoor unit is upper: 50 meters or less
The outdoor unit is lower: 40 meters or less (30 meters or less if PKFY-P10/15/20/25/32VLM,
PFFY-P*VKM, PFFY-P*VCM, PFFY-P*VL* type of indoor units are included.)
High/Low Difference in
Indoor/Indoor Section
(h) 15 meters or less
■ Selecting the Refrigerant Branch Kit
Use an optional branch piping kit (CMY-Y62-G-E).
■ Select Each Section of Refrigerant
Piping
(1) Section From Outdoor
Unit to First Branch (A)
Each
Section of
Piping
(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.
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch(Outdoor
Unit Piping Diameter)
Model Piping Diameter (mm)
PUMY-P112
PUMY-P125
PUMY-P140
Liquid Line ø9.52
Gas Line ø15.88
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Liquid Line (mm) Gas Line (mm)
ø9.52 ø15.88
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit (Indoor Unit
Piping Diameter)
Model Piping Diameter (mm)
– 50
Liquid Line ø6.35
Gas Line ø12.7
63 – 140
Liquid Line ø9.52
Gas Line ø15.88
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 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.)
<Additional Charge>
Calculation of refrigerant charge
Pipe size
Liquid pipe
ø6.35
+
Pipe size
Liquid pipe
ø9.52
+
Total capacity of connected indoor units Amount for the indoor units
– 8.0 kW 1.5 kg
(m) × 19.0 (g/m) (m) × 50.0 (g/m)
8.1 – 16.0 kW 2.5 kg
16.1 kW – 3.0 kg
Included refrigerant amount when shipped from the factory
Included refrigerant amount
4.8 kg
<Example>
Outdoor model: P125
Indoor 1: P63 (7.1 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 + B + C + a = 20 + 5 + 5 + 15 = 45 m
ø6.35: b + c + d = 10 + 10 + 20 = 40 m
The total capacity of connected indoor unit is as follows:
7.1 + 4.5 + 2.8 + 2.2 = 16.6
<Calculation example>
Additional refrigerant charge
A: ø9.52 mm 20 m
B: ø9.52 mm 5 m
C: ø9.52 mm 5 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
At the conditions
below:
40 × + 45 × + 3.0 = 6.1kg (rounded up)
1000 1000
19.0 50.0