11-3.Refrigerant Charging Calculation - Mitsubishi Electric City Multi PURY-M200YNW-A1 Data Book

11. PIPING DESIGN
11-3. Refrigerant charging calculation
Example
Outdoor unit
((E)M300)
A
HBC controller
Indoor unit Indoor unit
Outdoor unit
((E)M300)
A
<Amount of refrigerant to be added>
The amount of refrigerant that is shown in the table below is factory-charged to the outdoor units.
The amount necessary for extended pipe (field piping) is not included and must be added on site.
Outdoor unit model Amount of pre-charged refrigerant
in the outdoor unit (kg)
M200YNW
M250YNW
M300YNW
M350YNW
M400YNW
M450YNW
M500YNW
■ Calculation formula
・The amount of refrigerant to be added depends on the size and the total length of the high-pressure piping and liquid piping.
・Calculate the amount of refrigerant to be charged according to the formula below.
・Round up the calculation result to the nearest 0.1 kg (Example: 18.04 kg to 18.1 kg).
・The refrigerant does not need to be added for the indoor units in a Hybrid City Multi system.
<Formula>
・When the piping length from the outdoor unit to the farthest HBC controller is 10 m or shorter
Amount of
additional charge (kg)
MEES18K068
Indoor unit
B
HBC controller
C
D
HBC controller
Indoor unit Indoor unit
Outdoor unit model
5.2 EM200YNW
5.2 EM250YNW
5.2 EM300YNW
8.0 EM350YNW
8.0
EM400YNW
10.8 EM450YNW
10.8
EM500YNW
High-pressure pipe High-pressure pipe
= ø22.2 total length + ø19.05 total length
× 0.23 (kg/m) × 0.16 (kg/m)
Outdoor unit model Amount (kg)
(E)M200 1.0
(E)M250 1.0
(E)M300 0
+
(E)M350 0
(E)M400 0
(E)M450 0
(E)M500 0
* Amount of refrigerant to be charged
for single-module units
■ Sample calculation
Indoor 1: 50
2: 50
3: 50
4: 40
Outdoor M250
Indoor unit
The total length of each liquid line is as follows:
ø15.88: A = 42 m,
Therefore,
<Calculation example>
Additional refrigerant charge
= 42 × 0.09 + 2.8
= 6.58 kg
= 6.6 kg
* All pipe work except A is water pipe work.
Indoor 1: 50
2: 50
3: 50
4: 50
Outdoor M300
Indoor unit
The total length of each liquid line is as follows:
ø15.88: A = 18 m, ø15.88: B + C + D = 23m,
Indoor unit
Therefore,
<Calculation example>
Additional refrigerant charge
= 18 × 0.09 + (5 + 10 + 8) × 0.09 + 2.8 × 2
= 9.29 kg
= 9.3 kg
* All pipe work except A, B, C, D is water pipe work.
Amount of pre-charged refrigerant
in the outdoor unit (kg)
5.2
5.2
5.2
8.0
8.0
10.8
10.8
High-pressure pipe
+ ø15.88 total length
× 0.11 (kg/m)
Amount
(kg/HBC controller)
+
2.8
R2-Series
A: ø15.88 42 m
α = 2.8
1
A:ø15.88 18 m
B:ø15.88 5 m
C:ø15.88 10 m
D:ø15.88 8 m
α = 2.8 × 2
1
83