Refrigerant Charging Calculation - Mitsubishi Electric PQHY-P200YHM-A Data Book

(15)-6 Refrigerant charging calculation

Sample connection(with 8 indoor units)
HU HU
A
B
Heat source Twinning Kit
CMY-Y100VBK2
Amount of refrigerant to be charged
Refrigerant for extended pipes (field piping) is not factory-charged to the heat source unit. Add an appropriate amount of refrigerant
for each pipe on site.
Record the size of each liquid pipe and the amount of refrigerant that was charged on the heat source unit for future reference.
Calculating the amount of refrigerant to be charged
The amount of refrigerant to be charged is calculated with the size of the on-site-installed 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 refrigerant to be charged>
Calculating the amount of refrigerant to be charged
Total length of ø19.05
Total length of ø15.88
liquid pipe x 0.29 liquid pipe x 0.2
+
(m)x0.29(kg/m) (m)x0.2(kg/m)
Amount of factory-
charged refrigerant
Heat source unit model Charged amount
P200 model
5.0kg
P250 model
P300 model
C
D
a
1st Joint
IU
1 : P140
G
e
IU
5 : P100
Total length of ø12.7 Total length of ø9.52
liquid pipe x 0.12 liquid pipe x 0.06
+ +
(m)x0.12(kg/m)
Sample calculation
Indoor
A : ø9.52
3m 1:P140
B : ø12.70 2m 2:P100
C : ø19.05 40m
3:P80
D : ø15.88 10m
4:P71
E : ø12.70
5m 5:P100
F : ø9.52 5m 6:P80
G : ø9.52 30m 7:P63
H : ø9.52 5m
8:P25
I : ø9.52 5m
Total length for ø19.05 C=40
each pipe size : ø15.88 D=10m
ø12.70 B+E=2+5=7m
ø9.52 A+F+G+H+I+a+b+c+d+e+f+g=3+5+30+5+5+15+15+5+5+5+5+5=103m
ø6.35 i=5m
This yields the following result :
=40x0.29+10x0.2+7x0.12+103x0.06+5x0.024+5
=25.74kg
=25.8kg
E F
b c d
IU IU IU
2 : P100 3 : P80 4 : P71
H I
g i
f
IU IU IU
6 : P80 7 : P63 8 : P25
Total length of ø6.35
liquid pipe x 0.024
+
(m)x0.06(kg/m) (m)x0.024(kg/m)
a : ø9.52 15m
b : ø9.52 15m
c : ø9.52 5m
d : ø9.52 5m
e : ø9.52 5m
f : ø9.52 5m
g : ø9.52 5m
i : ø6.35 5m
- 62 -
Total capacity of connected Charged amount
indoor units
+
~80
81~160
161~330
331~390
391~480
481~630
631~710
711~
PFD-P250
PFD-P500
2.0kg
2.5kg
3.0kg
3.5kg
4.5kg
5.0kg
6.0kg
8.0kg
2.0kg
2.0kgx2