Mitsubishi Electric HYBRID CITY MULTI PURY-M200-300YNW-A Data Book page 49

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
Outdoor unit model Amount of pre-charged refrigerant
in the outdoor unit (kg)
EM200YNW
EM250YNW
EM300YNW
■ Calculation formula
The amount of refrigerant to be added depends on the size and the length of field piping. (unit in m[ft])
1) When the distance between HBC and outdoor unit is longer than 10m:
Amount of added refrigerant (kg) = (0.09 × L
2) When the distance between HBC and outdoor unit is 10m or shorter:
Amount of added refrigerant (kg) = (0.11 × L
L : Length of ø15.88 [5/8"] high pressure pipe (m)
1
α : Refer to the table below.
1
Use of one HBC controller
Outdoor unit index Diameter of high-pressure pipe
(E)M200 ø15.88
(E)M250 ø15.88
(E)M300 ø15.88
Round up the calculation result to the nearest 0.1kg. (Example: 18.04kg to 18.1kg)
■ 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.
Total index of the outdoor units
Factory charged
Maximum refrigerant charge Charged on site
MEES17K104
Indoor unit
B
HBC controller
C
D
HBC controller
Indoor unit Indoor unit
5.2
5.2
5.2
5.2
5.2
5.2
) + α
1 1
) + α
1 1
Amount for the HBC controller
α (kg)
1
2.8
M200 M250
YNW YNW
kg 5.2 5.2
kg 12.7 12.7
Total for system kg 17.9 17.9
■ Sample calculation
Indoor
Outdoor
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
Outdoor
Indoor unit
The total length of each liquid line is as follows:
Indoor unit
ø15.88: A = 18 m, ø15.88: B + C + D = 23m,
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.
Use of two HBC controllers
Outdoor unit index Diameter of high-pressure pipe
(E)M300
M300 EM200 EM250 EM300
YNW YNW YNW YNW
5.2 5.2 5.2 5.2
12.7 12.7 12.7
12.7
17.9 17.9 17.9
17.9
1: 50 A: ø15.88 42 m
2: 50
3: 50
4: 40
M250
α = 2.8
1
1: 50 A:ø15.88 18 m
2: 50 B:ø15.88 5 m
3: 50 C:ø15.88 10 m
4: 50 D:ø15.88 8 m
M300
α
Amount for the HBC controller
α (kg)
1
ø15.88 2.8
R2-Series
= 2.8 × 2
1
× 2
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