Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet page 53

ADDITIONAL REFRIGERANT CALCULATIONS (Y SERIES) example
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3. Piping Design
Example: PUHY-P350YKB
Indoor 1: P125
The total length of liquid pipe of each size is as follows:
ø12.7: A + e = 40 + 10 = 50 m
ø9.52: B + C + D + a + b + d = 10 + 15 + 10 + 10 + 5 + 10 = 60 m
ø6.35: c = 10 = 10 m
A
Additional
refrigerant charge
=
(kg)
=
= 12.5 (12.45) kg
Amount of factory charged refrigerant
Outdoor unit
Charged amount
model
P200 6.5kg
8.0kg
P250
P300
P350 11.5kg
P400
11.8kg
P450
Maximum refrigerant charge
There is a limit to the amount of refrigerant that can be charged into a unit. Regardless of the amount yielded by the formula above, observe the maximum
refrigerant charge in the table below.
Total index of the
P200YKB
outdoor units
Maximum *1
22.3kg
refrigerant charge
Total index of the
P800YSKB
outdoor units
Maximum *1
71.4kg
refrigerant charge
*1 Maximum refrigerant charge: the amount of factory-charged refrigerant and the amount of refrigerant to be added on site
A: ø12.7 40 m a: ø9.52
2: P100 B: ø9.52 10 m b: ø9.52
3: P40 C: ø9.52 15 m c: ø6.35
D: ø9.52 d: ø9.52
4: P32 10 m
5: P63 e: ø12.7
B
a b
P125 P100
Total length of liquid Total length of liquid
+
x 0.26 (kg/m) x 0.18 (kg/m)
0 (m) x 0.26 (kg/m) 0 (m) x 0.18 (kg/m)
0 + 0
P250YKB P300YKB P350YKB P400YSKB
29.7kg 32.7kg 33.6kg 45.0kg
P850YSKB P900YSKB P950YSKB P1000YSKB
73.2kg 75.7kg 96.9kg 99.9kg
10 m
5 m
10 m
10 m
10 m
C D
c
P40
Total length of liquid Total length of liquid
+ +
x 0.11 (kg/m) x 0.054 (kg/m)
50 (m) x 0.11 (kg/m) 60 (m) x 0.054 (kg/m)
+ 50 x 0.11 +
P450YSKB P500YSKB P550YSKB P600YSKB
45.9kg 47.0kg 51.3kg 53.9kg
P1050YSKB P1100YSKB P1150YSKB P1200YSKB
102.9kg 106.0kg 109.0kg 112.0kg
e
d
P32 P63
Total length of liquid
+
x 0.021 (kg/m)
10 (m) x 0.021 (kg/m)
60 x 0.054 + 10 x 0.021
P650YSKB P700YSKB P750YSKB
56.5kg 68.9kg 68.9kg
P1250YSKB P1300YSKB P1350YSKB
112.0kg 112.0kg 112.0kg
AN1 2nd
+ 0 + 3.5
+ 0 + 3.5
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