Specifications
WR2SD-30
WR2-SERIES SYSTEM DESIGN (June 2010)
WR2-SERIES
SYSTEM DESIGN
3. PIPING DESIGN
Sample connection (with 3 BC controller and 6 indoor units)
Amount of additional 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 pipes on site.
Record the size of each high pressure pipe and liquid pipe, and the amout of refrigerant that was charged on the heat source 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 high pressure pipes and liquid pip
es, 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[4oz]. (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 [1-1/8
"] 40m [131ft.] 1 : P18 a : ø6.35 [1/4"] 5m [16ft.]
B : ø9.52 [3/8
"] 10m [32ft.] 2 : P96 b : ø9.52 [3/8"] 3m [10ft.]
C : 3 : P06 c : ø6.35 [1/4
"] 2m [6ft.]
ø12.70 [1/2
"] 10m [32ft.]
4 : P08 d : ø6.35 [1/4
"] 3m [10ft.]
D :
5 : P54 e : ø9.52 [3/8
"] 3m [10ft.]
ø9.52 [3/8
"] 5m [16ft.]
6 : P72 f : ø9.52 [3/8
"] 10m [32ft.]
E :
ø9.52 [3/8
"] 5m [16ft.]
F : ø22.20 [7/8
"] 2m [6ft.]
G : ø22.20 [7/8
"] 1m [4ft.]
Total length for each pipe size : ø28.58 A = 40m [131ft.]
ø22.20 F+G = 2+1 = 3m [10ft.]
ø12.70 C = 10m [32ft.]
ø9.52 B+D+E+b+e+f = 36m [116ft.]
ø6.35 a+c+d =10m [32ft.]
Therefore, additional refrigerant charge = 40 0.36 + 3 0.23 + 10 0.12 + 36 0.06 + 10 0.024 + 9.0 + 2.0 + 6.0
= 37.69kg
= 37.7kg
BC controller (Main BC)
IU
a
IU
C
b
IU
1 : P18
2 : P96
CMY-R160-J
(Joint)
IU
CMY-Y102S-G
(Joint)
BC controller (Sub BC)
BC controller (Sub BC)
B
c d
IU
f
D
E
Field supplied
A
IU
e
F
H
Heat source Twinning kit (High/Low press.)
CMY-Q100VBK:
The Low press. kit must be placed in the heat source unit that has a larger capacity index
of the two, regardless of the relative positions of the heat source units or their addresses.
(If heat source units that have the same capacity are used in combination, the distributor
can be placed in either heat source unit.)
The High press. kit is to be installed in the field.
HU
(Main unit)
HU
(Sub unit)
Reducer (P06-P18)
(attached with BC controller)
G
3 : P064 : P08
5 : P54
6 : P72
Additional refrigerant
charge
(kg)[oz]
=
High pressure
pipe size
Total length of
ø 28.58mm[1-1/8 in]
(m) 0.36(kg/m)
(ft) 3.88(oz/ft)
(m) 0.2(kg/m)
(ft) 2.16(oz/ft)
(m) 0.16(kg/m)
(ft) 1.73(oz/ft)
(m) 0.11(kg/m)
(ft) 1.19(oz/ft)
(m) 0.23(kg/m)
(ft) 2.48(oz/ft)
High pressure
pipe size
Total length of
ø 22.2mm[7/8 in]
High pressure
pipe size
Total length of
ø 19.05mm[3/4 in]
High pressure
pipe size
Total length of
ø 15.88mm[5/8 in]
+++
+
Liquid Piping size
Total length of
ø 15.88mm[5/8 in]
(m) 0.12(kg/m)
(ft) 1.30(oz/ft)
+
Liquid Piping size
Total length of
ø 12.7mm[1/2 in]
(m) 0.06(kg/m)
(ft) 0.65(oz/ft)
+
Liquid Piping size
Total length of
ø 9.52mm[3/8 in]
(m) 0.024(kg/m)
(ft) 0.26(oz/ft)
+
Liquid Piping size
Total length of
ø 6.35mm[1/4 in]
+
BC controller
(Standard / Main)
3.0 kg[106oz]
+
BC controller
(Sub) Total Units
1
2
Charged amount
1.0 kg[36oz]
2.0 kg[71oz]
+
Total Capacity of
Connected Indoor Units
Models 28 ~ 54
Models 55 ~ 126
Models 127 ~ 144
Models 145 ~ 180
Models 181 ~ 234
Models 235 ~ 273
Models 274 ~ 307
Models 308 ~ 342
Models 343 ~ 411
Models 412 ~
Models ~ 27
Charged amount
2.0 kg [71 oz]
2.5 kg [89 oz]
3.0 kg [106 oz]
3.5 kg [124 oz]
4.5 kg [159 oz]
5.0 kg [177 oz]
6.0 kg [212 oz]
8.0 kg [283 oz]
9.0 kg [318 oz]
10.0 kg [353 oz]
12.0 kg [424 oz]
Heat source unit
Model
P120
P96
P72
Charged amount
5.0 kg
(kg)
Therefore, additional refrigerant charge
= 1220.1oz
= 1220oz
(oz)
or
= 131 3.58+10 2.48+32 1.30+116 0.65+32 0.26+318+71+212
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
*1 Amount of additional refrigerant to be charged on site.
Limitation of the amount of refrigerant to be charged
Heat source unit model P72 P96 P120 P144 P168 P192 P216 P240
26.3 32.8 33.8 45.5 47.0 58.2 67.2 70.9
Maximum amount of refrigerant *1 kg
928 1157 1192 1605 1658 2053 2370 2501(oz)
3-3. Refrigerant Charging Calculation