12-3.Refrigerant Charging Calculation - Mitsubishi Electric CITY MULTI PURY-HP72TNU-A Data Book

12. PIPING DESIGN
12-3. Refrigerant charging calculation
Sample connection (with 5 BC controllers and 8 indoor units) (PURY-HP240YSNU-A)
OU
(Main unit)
OU
(Sub unit)
Outdoor Twinning kit
Pipe (Low pressure)
G H H
G
A
A
Pipe (High 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 R2 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)
Main or Sub
BC controller
J-type
+
JA-type
KA-type
KB-type
* In the case all connected indoor unit models are Case 1 or Case 2, do NOT add the refrigerant listed in table <A>.
Instead, add the following amount of refrigerant.
Case 1: PLFY-EP06/18/36NEMU-E**
→ Add 0.67 kg per PLFY-EP06/18/36NEMU-E**.
Case 2: PEFY-P06/24/36NMAU-E**
→ Add 0.55 kg per PEFY-P06/24/36NMAU-E**.
* 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
MEES19K180
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)
Total capacity of connected
Amount
(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)
f
Pipe
f
(Liquid)
IU
6 : P36
High-pressure pipe High-puressure pipe
ø15.88 total length
ø19.05 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
Hyper Heating Inverter R2-Series
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)
Total capacity of
Amount (kg)
outdoor units
72 1.5
+
96 1.5
120 3.0
144 2.5
192 4.0
240 5.0
Table <A>
110