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1. Piping Design
1-3. Refrigerant charging calculation
■ PQRY-P-T(S)LMU-A1/Y(S)LMU-A1
Sample connection (with 5 BC controllers and 8 indoor units) (PQRY-P288YSLMU-A1)
Heat source Twinning kit (High/Low press.)
HU
HU
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.
Pipe (High pressure)
N
A
L
M
A
Pipe (Low pressure)
BC controller (Main BC)
*Refer to the
installation manual
a
for the connection.
a
b
IU
IU
1 : P18
2 : P96
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)
<Amount of additional refrigerant to be charged>
Calculating the amount of additional refrigerant to be charged
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
High-pressure pipe
additional
=
ø28.58 total length
charge (kg)
× 0.36 (kg/m)
Liquid pipe ø19.05
+
total length
× 0.29 (kg/m)
Heat source unit model
+
Single
Main or Sub
BC controller
J-type
+
JA-type
KA-type
KB-type
* 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
MEES19K187
5 : P48
IU
e
e
BC controller (Sub BC)
C
C
C
Joint
Joint
B
b
B
d
c
d
c
IU
IU
3 : P06
4 : P06
High-pressure pipe
+
ø22.2 total length
+
× 0.23 (kg/m)
Liquid pipe ø15.88
+
total length
+
× 0.2 (kg/m)
Additional charge
Charged amount
P216
1.0 kg
1.0 kg
P240
Amount
Total capacity of connected
(kg/unit)
indoor units
1.5
27 or below
3.0
28 to 54
4.7
55 to 126
0.4
127 to 144
145 to 180
+
181 to 234
235 to 273
274 to 307
308 to 342
343 to 411
412 to 450
451 or above
Joint
Joint
D
E
D
E
D
E
BC controller (Sub BC)
BC controller (Sub BC)
Pipe (Gas)
Pipe
f
f
(Liquid)
IU
6 : P36
High-pressure pipe
High-puressure pipe
ø19.05 total length
+
ø15.88 total length
× 0.11(kg/m)
× 0.16 (kg/m)
Liquid pipe ø12.7
Liquid pipe ø9.52
total length
+
total length
× 0.12 (kg/m)
× 0.06 (kg/m)
Amount (kg)
(to be added for
indoor unit)
2.0
2.5
3.0
3.5
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0
Pipe (LP Gas)
Pipe (Liquid)
Pipe (HP Gas)
Joint
F
F
F
BC controller (Sub BC)
g
g
h
h
IU
7 : P30
IU
8 : P18
Liquid pipe ø6.35
+
total length
× 0.024 (kg/m)
352
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