Mitsubishi Electric PUHY-RP-Y(S)JM-B, Справочник данных

Страница: 278 / 293

275
3. Piping Design
SYSTEM DESIGN
3-2. Refrigerant charging calculation
Sample connection (with BC controller and 4 indoor units)
Amount of additional refrigerant to be charged
Refrigerant for extended pipes (field piping) is not factory-charged to the outdoor unit. Add an appropriate amount of refrigerant for each pipes on site.
Record the size of each high pressure pipe and liquid pipe, and the amout of refrigerant that was charged on the outdoor unit for future reference.
Calculating the amount of additional refrigerant to be charged
The amount of refrigerant to be charged is calculated with the size of the on-site-installed hige pressure pipes and liquid pipes, and their length.
Calculate the amount of refrigerant to be charged according to the formula below.
Round up the calculation result to the nearest 0.1kg. (i.e., 16.08 kg = 16.1 kg)
<Amount of additional refrigerant to be charged>
Calculating the amount of additional refrigerant to be charged
Amount of factory charged refrigerant Sample calculation
Indoor
A : ø28.58 40m 1 : P80 a : ø9.52 5m
B : ø9.52 10m 2 : P125 b : ø12.7 3m
3 : P15 c : ø6.35 2m
4 : P20 d : ø6.35 3m
Total length for each pipe size : ø15.88 A = 40m
ø12.70 b = 3m
ø9.52 B + a = 10 + 5 = 15 m
ø6.35 c + d = 2 + 3 = 5 m
Therefore, additional refrigerant charge = 0.11 x 40 + 0.12 x 3 + 0.06 x 15 + 0.024 x 5 + 2 + 3
= 10.78 kg
= 10.8 kg
Additional refrigerant
charge
(kg)
= +
High pressure
pipe size
Total length of ø 19.05
x 0.16
(m) x 0.16(kg/m)
+
High pressure
pipe size
Total length of ø 15.88
x 0.11
(m) x 0.11(kg/m)
Liquid pipe size
Total length of ø 12.7
x 0.12
(m) x 0.12(kg/m)
+
Liquid pipe size
Total length of ø 9.52
x 0.06
(m) x 0.06(kg/m)
+
Liquid pipe size
Total length of ø 6.35
x 0.024
(m) x 0.024(kg/m)
+
Total outdoor unit
Model
RP200
RP250
RP300
Charged amount per
BC controller
(Standard / Main)
2.0 kg
3.0 kg
+
BC controller
(Sub) Total units
1 unit
2 units
Charged amount Charged amount
1.0 kg
2.0 kg
+
Total capacity
of connected
indoor units
-80
81 - 160
2.0 kg
2.5 kg
161 - 330
331 - 390
3.0 kg
3.5 kg
391 - 450 4.5 kg
Outdoor unit
Model
RP200
RP250
RP300
Charged amount
11.8 kg
(P100-250)
BC controller
a
b
H H'
h1
IU
(P15-P80)
Joint
(CMY-R160-J1)
IU
Joint
Max.3 sets for 1 port.
Total capacity <= P80
B
c
d
IU
A
OU
Reducer (P15~P50)
(attached with BC controller)
IU
h2
For outodoor units equal to or larger than a size P400, on
the BC controller please ensure CMB-P
• V-GA1 is used.