4) RefrGerant ChargNg CalculatOn (R2 System - Mitsubishi PWFY-P100VM-E-BU Data Book

(4) Refrgerant chargng calculaton (R2 system)

Sample connection (with 3 BC controller and 6 indoor units)
OU
(Main unit)
(Sub unit)
H
F
G
Reducer (P15-P50)
(attached with BC controller)
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 hige 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., 16.08 kg = 16.1 kg)
<Amount of additional refrigerant to be charged>
Calculating the amount of additional refrigerant to be charged
High pressure
Additional refrigerant pipe size
charge Total length of ø 28.58
=
(kg) (m) x 0.36(kg/m)
Liquid pipe size
Total length of ø 15.88
+
(m) x 0.20(kg/m)
Total outdoor unit
Model
+
(E)P200
(E)P250 - (E)P500
(E)P550 - P900
Amount of factory charged refrigerant
Outdoor unit
Charged amount
Model
P200
EP200
9.5 kg
P250
P300
EP250
EP300
P350
11.8 kg
EP350
P400
P450
Limitation of the amount of refrigerant to be charged
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
Outdoor unit model P200
Maximum amount of
24.8kg
refrigerant *1
Outdoor unit model EP200
Maximum amount of
27.3kg
refrigerant *1
*1 Amount of additional refrigerant to be charged on site
OU
Outdoor Twinning kit (High/Low press.)
CMY-R100VBK: Outdoor unit P400 (A1) to P650 / EP400 to EP600 (-A)
CMY-R200VBK: Outdoor unit P700 to P800 (-A)
CMY-R100XLVBK: Outdoor unit P800 (-A1) / EP600 (-A1) to EP700
CMY-R200XLVBK: Outdoor unit P850 and P900
The Low press. kit is set in the Main unit;
The High press. kit is to be installed in the field.
A
BC controller (Main BC)
a
b
CMY-R160-J1
(Joint)
IU
IU
2 : P250
1 : P50
High pressure
pipe size
Total length of ø 22.20
+
x 0.36 x 0.23
(m) x 0.23(kg/m)
Liquid pipe size
Total length of ø 12.7
+
x 0.2 x 0.12
(m) x 0.12(kg/m)
Charged amount per Charged amount per
BC controller BC controller
(Standard / Main) (Main) HA-type
+
2.0 kg
2.0 kg
3.0 kg
5.0 kg
Sample calculation
Indoor 1: 80 A: ø28.58
2: 250 B: ø9.52
3: 32 C: ø9.52
4: 40 D: ø9.52
5: 32 E: ø9.52
6: 63 F: ø22.2
G: ø19.05
Outdoor
P550
P250 P300 P350 P400
33.8kg 34.8kg 39.7kg 46.7kg
EP250 EP300 EP350 EP400
34.0kg 35.0kg 39.7kg 47.5kg
CMY-Y202S-G2
CMY-Y102LS-G2
CMY-Y102SS-G2
(Joint)
C
CMY-Y102SS-G
(Joint)
B
c d
IU IU
3 : P15 4 : P20
High pressure High pressure
pipe size
Total length of ø 19.05 Total length of ø 15.88
+ +
x 0.16
(m) x 0.16(kg/m)
Liquid pipe size Liquid pipe size
Total length of ø 9.52 Total length of ø 6.35
+ +
x 0.06
(m) x 0.06(kg/m)
BC controller
Charged amount
(Sub) Total units
+
1 unit 1.0 kg
2 units 2.0 kg
The total length of each liquid line is as follows:
40m a: ø9.52 10m ø28.58: A = 40 m
ø22.2: F = 3 m
10m b: ø9.52 5m
ø19.05: G = 1 m
20m c: ø6.35 5m
ø9.52: C + D + E + a + b + f = 50 m
5m d: ø6.35 10m
ø6.35: c + d + e = 20 m
5m e: ø6.35 5m
Therefore,
3m f: ø9.52 5m
<Calculation example>
1m
Additional refrigerant charge
= 40 × 0.36 + 3 × 0.23 + 1 × 0.16 + 50 × 0.06 + 20 × 0.024 + 5 + 2 + 5
= 30.8 kg
P450 P500 P550 P600
53.7kg 60.2kg 69.2kg 72.9kg
EP450 EP500 EP550 EP600
49.2kg 62.9kg 69.6kg 73.3kg
- 79 -
IU
e
5 : P140
BC controller (Sub BC)
D
BC controller (Sub BC)
E
f
IU
6 : P200
pipe size
x 0.11
(m) x 0.11(kg/m)
x 0.024
(m) x 0.024(kg/m)
Total capacity
of connected
Charged amount
+ indoor units
-80 2.0 kg
81 - 160 2.5 kg
161 - 330 3.0 kg
331 - 390 3.5 kg
391 - 480 4.5 kg
481 - 630 5.0 kg
631 - 710 6.0 kg
711 - 800 8.0 kg
801 - 890 9.0 kg
891 - 1070 10.0 kg
1071 - 1250 12.0 kg
1251 - 14.0 kg
P650 P700 P750
74.6kg 90.3kg 91.5kg 91.5kg
EP650 EP700
74.8kg 74.8kg
P800 P850 P900
91.5kg 91.5kg