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10. Additional refrigerant charge
At the time of shipping, the heat source unit is charged with refrigerant.
This charge does not include the total amount necessary for extended piping
lengths, so an additional charge of each refrigerant line will be required on
site. 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 heat
source unit for future reference.
<Additional Charge>
Piping length from outdoor unit to the farthest indoor unit
Use table [A].
Piping length from outdoor unit to the farthest indoor unit > 30.5 m [100 ft]:
Use table [B].
Additional
Liquid pipe size
refrigerant
Total length of
charge
ø19.05 mm [3/4in]
+
=
[A]
[A]
[B]
[B]
Liquid pipe size
Total length of
ø9.52 mm [3/8in]
+
+
[A]
[B]
Additional charge
Heat source unit model
+
P216
Single
P240
<Example>
Indoor 1: 36
A: ø12.7 [1/2in] 40 m [131ft] a: ø9.52 [3/8in] 10 m [32ft]
2: 30
B: ø9.52 [3/8in]
10 m [32ft] b: ø9.52 [3/8in]
3: 15
C: ø9.52 [3/8in]
15 m [49ft] c: ø6.35 [1/4in] 10 m [32ft]
4: 12
D: ø9.52 [3/8in]
10 m [32ft] d: ø6.35 [1/4in] 10 m [32ft]
5: 24
The total length of each liquid line is as follows:
ø12.7 [1/2in]: A = 40 m [131ft]
ø9.52 [3/8in]: B + C + D + a + b + e = 10 [32] + 15 [49] + 10 [32] + 10 [32] + 5 [16]
+ 10 [32] = 60m [193ft]
ø6.35 [1/4in]: c + d = 10 [32] + 10 [32] = 20 m [64ft]
Therefore, additional refrigerant charge
= 40m [131ft] × 0.11 kg/m [1.19 oz/ft] + 60 [193ft] × 0.054 kg/m [0.59 oz/ft]
+ 20 [64 ft] × 0.021 kg/m [0.23 oz/ft] + 3.0 kg [106 oz] = 11.1 kg [392 oz]
Total capacity of connecting indoor units
Models
~
27
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 ~ 480
Models 481 ~
30.5 m [100 ft]:
Liquid pipe size
Liquid pipe size
Total length of
Total length of
ø15.88 mm [5/8in]
ø12.7 mm [1/2in]
+
[A]
[A]
[B]
[B]
Liquid pipe size
Total length of
ø6.35 mm [1/4in]
[A]
[B]
Charged amount
+
1.0kg
1.0kg
At the
5 m [16ft]
conditions
below:
e: ø9.52 [3/8in] 10 m [32ft]
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]
14.0 kg [494 oz]
10.1. Calculation of additional refrigerant
charge
Calculate the amount of additional charge based on extended piping lengths
and the refrigerant line size.
Use the table below as a guide for calculating the amount of additional
charge and then charge the system accordingly.
If the calculation results in a fraction of less than 0.1 kg [4oz], round up to the
next 0.1 kg [4oz]. For example, if the result of the calculation was 28.73 kg
[1014oz], round the result up to 28.8 kg [1016oz].
<Additional charge>
Piping length from outdoor unit to the farthest indoor unit
Use table [A].
Piping length from outdoor unit to the farthest indoor unit > 30.5 m [100 ft]:
Use table [B].
High-pressure
Additional
pipe size
refrigerant
Total length of
charge
ø28.58 mm [1-1/8in]
+
=
[A]
[A]
[B]
[B]
High-pressure
pipe size
Total length of
ø15.88 mm [5/8in]
+
+
[A]
[B]
Liquid Piping Size
Total length of
ø9.52 mm [3/8in]
+
+
[A]
[B]
Additional charge
Heat source unit model
+
P216
Single
P240
BC controller
+
+
3.0kg [106oz]
Total Capacity of
Connected Indoor Units
Models
~ 27
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 ~
<Example>
Indoor 1: 30
A: ø28.58 [1-1/8] 40 m [131ft] a: ø9.52 [3/8]
2: 96
B: ø9.52 [3/8]
10 m [32ft] b: ø9.52 [3/8]
3: 12
C: ø9.52 [3/8]
20 m [64ft] c: ø6.35 [1/4]
4: 15
D: ø9.52 [3/8]
5 m [16ft]
5: 12
E: ø9.52 [3/8]
5 m [16ft]
6: 24
F: ø22.2 [7/8]
3 m [9ft]
G: ø19.05 [3/4]
1 m [3ft]
The total length of each liquid line is as follows:
ø28.58 [1-1/8in]: A = 40 m [131ft]
ø22.2 [7/8in]: F = 3 m [9ft]
ø19.05 [3/4in]: G = 1 m [3ft]
ø9.52 [3/8in]: C + D + E + a + b + f = 50 m [164ft]
ø6.35 [1/4in]: c + d + e = 20 m [64ft]
Therefore, additional refrigerant charge
= 40m [131ft]
0.33 kg/m [3.55 oz/ft] + 3 m [9 ft]
+ 1 [3ft]
0.14 kg/m [1.51 oz/ft] + 50m [164ft]
+ 20 m [64ft]
0.021 kg/m [0.23 oz/ft] + 3.0 kg [106 oz] + 2.0 kg [71 oz]
+ 5.0 kg [177 oz]
= 27.1 kg [956 oz]
30.5 m [100 ft]:
High-pressure
High-pressure
pipe size
pipe size
Total length of
Total length of
ø22.2 mm [7/8in]
ø19.05 mm [3/4in]
+
[A]
[A]
[B]
[B]
Liquid Piping Size
Liquid Piping Size
Total length of
Total length of
ø15.88 mm [5/8in]
ø12.7 mm [1/2in]
+
[A]
[A]
[B]
[B]
Liquid Piping Size
Total length of
ø6.35 mm [1/4in]
[A]
[B]
Charged amount
1.0kg
1.0kg
BC controller
BC controller
1
1.0kg [36oz]
2
2.0kg [71oz]
Per Indoor Unit
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]
10 m [32ft]
5 m [16ft]
At the
5 m [16ft]
d: ø6.35 [1/4]
10 m [32ft]
conditions
e: ø6.35 [1/4]
5 m [16ft]
below:
f: ø9.52 [3/8]
5 m [16ft]
0.21 kg/m [2.26 oz/ft]
0.054 kg/m [0.59 oz/ft]
27
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