11
GB
10. Additional refrigerant charge
At the time of shipping, the outdoor unit is charged with refrigerant.
This charge does not include the amount needed for extended piping and
additional charging of each refrigerant line will be required on-site. In order that
future servicing may be properly provided, always keep a record of the size and
length of each refrigerant line and the amount of additional charge by writing it in
the space provided on the outdoor unit.
10.1. Calculation of additional refrigerant
charge
Calculate the amount of additional charge based on the length of the piping
extension and the size of the refrigerant line.
Use the table below as a guide for calculating the amount of additional
charging and then charge the system accordingly.
If the calculation results in a fraction of less than 0.1 kg [4 oz], round up
to the next 0.1 kg [4 oz]. For example, if the result of the calculation was
27.73 kg [979 oz], round the result up to 27.8 kg [981 oz].
•
•
•
<Additional charge>
Additional refrigerant
charge
=
High-pressure
pipe size
Total length of
ø28.58 mm [1-1/8 in] +
High-pressure
pipe size
Total length of
ø22.2 mm [7/8 in]
+
High-pressure
pipe size
Total length of
ø19.05 mm [3/4 in]
+
High-pressure
pipe size
Total length of
ø15.88 mm [5/8 in]
(kg) [oz]
(m) × 0.36 (kg/m)
(ft) × 3.88 (oz/ft)
(m) × 0.23 (kg/m)
(ft) × 2.48 (oz/ft)
(m) × 0.16 (kg/m)
(ft) × 1.73 (oz/ft)
(m) × 0.11 (kg/m)
(ft) × 1.19 (oz/ft)
+
Liquid Piping Size
Total length of
ø15.88 mm [5/8 in]
+
Liquid Piping Size
Total length of
ø12.7 mm [1/2 in]
+
Liquid Piping Size
Total length of
ø9.52 mm [3/8 in]
+
Liquid Piping Size
Total length of
ø6.35 mm [1/4 in]
(m) × 0.2 (kg/m)
(ft) × 2.16 (oz/ft)
(m) × 0.12 (kg/m)
(ft) × 1.30 (oz/ft)
(m) × 0.06 (kg/m)
(ft) × 0.65 (oz/ft)
(m) × 0.024 (kg/m)
(ft) × 0.26 (oz/ft)
+
Total Outdoor Unit
Model Name
BC controller
(Standard/Main)
Per Unit
+
BC controller
(Sub) Total Units
BC controller
(Sub) Per Unit
+
Total Capacity of
Connected Indoor Units
Per Indoor Unit
P72
3.0 kg [106 oz]
1
1.0 kg [36 oz]
Models
~ 27
2.0 kg [71 oz]
P96
4.5 kg [160 oz]
2
2.0 kg [71 oz]
Models 28 ~ 54
2.5 kg [89 oz]
P120
Models 55 ~ 126
3.0 kg [106 oz]
P144
6.0 kg [212 oz]
Models 127 ~ 144
3.5 kg [124 oz]
P168
7.5 kg [265 oz]
Models 145 ~ 180
4.5 kg [159 oz]
P192
9.0 kg [318 oz]
Models 181 ~ 234
5.0 kg [177 oz]
P216
Models 235 ~ 273
6.0 kg [212 oz]
P240
Models 274 ~ 307
8.0 kg [283 oz]
Models 308 ~ 342
9.0 kg [318 oz]
Models 343 ~ 411
10.0 kg [353 oz]
Models 412 ~
12.0 kg [424 oz]
<C> Pipe connection example
The distributor on the low-pressure side must be placed in the outdoor unit that has a larger capacity index of the two, regardless of the relative positions of the
outdoor units or their addresses.
(If outdoor units that have the same capacity are used in combination, the distributor can be placed in either outdoor unit.)
If the distributor is placed in the outdoor unit that has a smaller capacity, refrigerant will not be properly distributed and compressor failure may result.
F
H
G
J
K
I
F
Twinning pipe (low-pressure side)
G
Twinning pipe (high-pressure side)
H
On-site piping (low-pressure connecting pipe: between outdoor units)
I
On-site piping (low-pressure main pipe: to BC controller)
J
On-site piping (high-pressure main pipe: to BC controller)
K
Straight run of pipe that is 500 mm [19-11/16 in] or more
