Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet page 55

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ADDITIONAL REFRIGERANT CALCULATIONS (R2 SERIES) example
3. Piping Design
• When the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft)
Amount of High-pressure pipe
additional = ø28.58 total length
charge (kg) × 0.33 (kg/m)
Liquid pipe ø12.7
+ total length
× 0.11 (kg/m)
Total capacity of
outdoor units
P200
+
P250
P300
P350–900
Number of sub BC
controllers
+
1
2
Outdoor unit model
Single
+
Combination
Amount of factory charged refrigerant
Outdoor unit
Charged amount
Model
P200
9.5 kg
P250
P300
10.3 kg
P350
P400
P450 11.8 kg
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.
P200 P250
Outdoor unit model
YLM YLM
Maximum amount of
27.5kg 33.5kg
refrigerant *1
*1 Amount of additional refrigerant to be charged on site
High-pressure pipe High-pressure pipe
+ ø22.2 total length + ø19.05 total length
× 0.21 (kg/m) × 0.14 (kg/m)
Liquid pipe ø9.52 Liquid pipe ø6.35
+ total length + total length
× 0.054 (kg/m) × 0.021 (kg/m)
Amount
(to be added for standard or
+
main BC controller)
3.0kg
4.5kg
4.5kg
6.0kg
Amount
Total capacity of connected
(to be added for sub
indoor units
BC controller)
1.0kg 80 or below
2.0kg
161 to 330
331 to 390
391 to 480
+
481 to 630
631 to 710
711 to 800
801 to 890
891 to 1070
1071 to 1250
1251 or above
Amount
(to be added for
outdoor unit)
P200 to P250YLM 0kg
P300 to P350YLM 0kg
P400 to P550YSLM 0kg
P600 to P800YSLM 0kg
P850YSLM 5.5kg
P900YSLM 11.0kg
Sample calculation
Indoor 1: 50 A: ø28.58 40m
2: 250 B: ø9.52 10m
3: 15 C: ø12.70 20m
4: 20 D: ø9.52 5m
5: 140 E: ø9.52 5m
6: 200 F: ø19.05 3m
G: ø19.05 1m
Outdoor P700
P300 P350 P400 P450
YLM YLM YSLM YSLM YSLM
37.0kg 39.0kg 52.0kg 52.0kg 52.0kg
High-pressure pipe
+ ø15.88 total length +
× 0.1 (kg/m)
Main BC controller Amount
HA-type 2.0kg
Amount
(to be added for
indoor unit)
2.0kg
81 to 160 2.5kg
3.0kg
3.5kg
4.5kg
5.0kg
6.0kg
8.0kg
9.0kg
10.0kg
12.0kg
14.0kg
The total length of each liquid line is as follows:
a: ø6.35 10m ø28.58: A = 40 m
ø19.05: F + G = 4 m
b: ø9.52 5m
ø12.70: C = 20 m
c: ø6.35 5m
ø9.52: B + D + E + b + e + f = 35 m
d: ø6.35 10m
ø6.35: a + c + d = 25 m
e: ø9.52 5m
Therefore,
f: ø9.52 5m
<Calculation example>
Additional refrigerant charge
= 40 × 0.33 + 4 × 0.14 + 20 × 0.11 + 35 × 0.054 + 25 × 0.021 + 6
+ 2 + 2 + 6
= 34.4 (34.375) kg
P500 P550 P600 P650 P700
YSLM YSLM YSLM YSLM
59.0kg 62.5kg 75.0kg 79.5kg
AN1 2nd
Liquid pipe ø15.88
total length
× 0.18 (kg/m)
P750 P800 P850 P900
YSLM YSLM YSLM YSLM
79.5kg 79.5kg 84.0kg 89.0kg
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