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Mitsubishi Electric PURY-HP72 Service Handbook page 174

R410a
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[6-9 Evaluating and Adjusting Refrigerant Charge ]
1) 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 outdoor units
Maximum refrigerant charge
Maximum refrigerant charge
*1 Maximum refrigerant charge: the amount of factory-charged refrigerant and the amount of refrigerant to be added on site.
(2) Example
Outdoor unit 1
h4
F
H H'
Reducer
(Supplied with the BC Controller)
h1
(3) Sample calculation
Outdoor unit 1 : 96 model
Outdoor unit 2 : 96 model
Indoor unit 1 : 30 model
Indoor unit 2 : 96 model
When
Indoor unit 3 : 12 model
Indoor unit 4 : 15 model
Indoor unit 5 : 12 model
Indoor unit 6 : 24 model
The aggregate length of each liquid pipe type.
The piping length between the outdoor unit and the farthest indoor unit
F + A + C + D + e = 73 meters [239ft], which is longer than 30.5 m [100 ft].
Therefore,
The amount of refrigerant to be charged [kg]=40×0.21+4×0.14+60×0.054+20×0.021+6+2+5+2=27.7 kg
The amount of refrigerant to be charged [oz]=131×2.26+13×1.51+196×0.59+65×0.23+212+71+177+71=978 oz
HWE13080
HP72
HP96
*1
(kg)
39.0
47.3
*1
[lbs-oz]
86-0
104-3
Outdoor unit 2
Branch joint kit
G
A
BC controller(GA)
Branch joint
(CMY-Y102S-G2)
Junction pipe kit
a
b
(CMY-R160-J)
(Optional accessory)
1
2
Indoor
Indoor
(P06 - P54)
(P72 - P96)
A : 22.2
B : 9.52
C : 9.52
D : 9.52
E : 9.52
F : 19.05
G : 19.05
22.2
A = 40m [131ft]
19.05
F+G = 4m [13ft]
9.52
B+C+D+E+a+b+f = 60m [196ft]
6.35
c+d+e = 20m [65ft]
- 163 -
HP144
HP192
58.5
86.3
129-0
190-3
Branch joint
(CMY-Y202-G2)
(CMY-Y102L-G2)
BC controller(HB)
D
(CMY-Y102S-G2)
C
BC controller(HB)
E
B
c
d
3
4
Indoor
Indoor
Maximum of 3 units per port
Total capacity of P54 or below
[7/8"]
40m
[131ft]
a : 9.52
[3/8"]
10m
[32ft]
b : 9.52
[3/8"]
20m
[65ft]
c : 6.35
[3/8"]
5m
[16ft]
d : 6.35
[3/8"]
5m
[16ft]
e : 6.35
[3/4"]
3m
[9ft]
f : 9.52
[3/4"]
1m
[3ft]
5
Indoor
e
h1
h3
h2
f
h1
6
Indoor
[3/8"]
10m
[32ft]
[3/8"]
5m
[16ft]
[1/4"]
5m
[16ft]
[1/4"]
10m
[32ft]
[1/4"]
5m
[16ft]
[3/8"]
5m
[16ft]
GB

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