MEES21K047
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123
12. PIPING DESIGN
WR2-Series-575V
12-3. Refrigerant charging calculation
Sample connection (with 5 BC controllers and 8 indoor units) (PQRY-P288ZSLMU-A1)
<Amount of additional refrigerant to be charged>
Calculating the amount of additional refrigerant to be charged
Amount of additional refrigerant to be charged
Refrigerant for extended pipes (field piping) is not factory-charged to the outdoor unit. Add an appropriate amount of refrigerant for each pipes on site.
Record the size of each high pressure pipe and liquid pipe, and the amout of refrigerant that was charged on the outdoor unit for future reference.
Calculating the amount of additional refrigerant to be charged
The amount of refrigerant to be charged is calculated with the size of the on-site-installed high pressure pipes and liquid pipes, and their length.
Calculate the amount of refrigerant to be charged according to the formula below.
Round up the calculation result to the nearest 0.1kg. (i.e., 16.03 kg = 16.1 kg)
* High-pressure pipe: Main high-pressure pipe between outdoor unit and BC controller
* Liquid pipe: Liquid pipe between BC controller and indoor unit or between main BC controller and sub BC controller
Units "m" and "kg" (In an WR2 system)
<Formula>
• When the piping length from the outdoor unit to the farthest indoor unit is 30.5 m (100 ft) or shorter
Amount of
additional
charge (kg)
=
High-pressure pipe
ø28.58 total length
× 0.36 (kg/m)
+
High-pressure pipe
ø22.2 total length
× 0.23 (kg/m)
+
High-pressure pipe
ø19.05 total length
× 0.16 (kg/m)
+
High-puressure pipe
ø15.88 total length
× 0.11(kg/m)
+
Liquid pipe ø19.05
total length
× 0.29 (kg/m)
+
Liquid pipe ø9.52
total length
× 0.06 (kg/m)
+
Liquid pipe ø6.35
total length
× 0.024 (kg/m)
+
Liquid pipe ø15.88
total length
× 0.2 (kg/m)
+
Liquid pipe ø12.7
total length
× 0.12 (kg/m)
+
Total capacity of connected
indoor units
Amount (kg)
(to be added for
indoor unit)
27 or below
2.0
28 to 54
2.5
55 to 126
3.0
127 to 144
3.5
145 to 180
4.5
181 to 234
5.0
235 to 273
6.0
274 to 307
8.0
308 to 342
9.0
343 to 411
10.0
412 to 450
12.0
451 or above
14.0
+
Main or Sub
BC controller
Amount
(kg/unit)
J-type
1.5
JA-type
3.0
KA-type
4.7
KB-type
0.4
IU
7 : P30
BC controller (Sub BC)
BC controller (Sub BC)
BC controller (Sub BC)
BC controller (Sub BC)
IU
a
a
b
b
IU
IU
IU
B
B
c
c
d
d
IU
IU
e
e
f
f
h
h
C
C
C
D
D
D
E
E
E
F
F
F
IU
Joint
Joint
Joint
Joint
*Refer to the
installation manual
for the connection.
5 : P48
1 : P18
2 : P96
3 : P06
4 : P06
6 : P36
g
g
8 : P18
Joint
Pipe (LP Gas)
Pipe (HP Gas)
Pipe (Liquid)
Pipe (Gas)
Pipe
(Liquid)
Heat source Twinning kit (High/Low press.)
CMY-Q100CBK2: Heat source unit P144 to P240
CMY-Q200CBK: Heat source unit P288 to P336
The Low press. kit is set in the Main unit;
The High press. kit is to be installed in the field.
HU
HU
L
A
M
BC controller (Main BC)
Pipe (Low pressure)
Pipe (High pressure)
A
N
0000006382.BOOK 123 ページ ２０２１年７月１９日 月曜日 午後４時１４分
