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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.
For PQHY-P·T(S)HMU-A/Y(S)HMU-A
<Additional Charge>
Additional
Liquid pipe size
refrigerant charge
Total length of
ø19.05 × 0.29
=
(kg)
(m) × 0.29 (kg/m)
(oz)
(ft) × 3.1 (oz/ft)
Liquid pipe size
Total length of
ø9.52 × 0.06
+
(m) × 0.06 (kg/m)
(ft) × 0.65 (oz/ft)
<Example>
Indoor 1: 36
A: ø12.7 [1/2] 40 m [131ft] a: ø9.52 [3/8]
2: 30
B: ø9.52 [3/8]
10 m [32ft] b: ø9.52 [3/8]
3: 15
C: ø9.52 [3/8]
15 m [49ft] c: ø6.35 [1/4]
4: 12
D: ø9.52 [3/8]
10 m [32ft] d: ø6.35 [1/4]
5: 24
The total length of each liquid line is as follows:
ø12.7: A = 40 = 40 m [131ft]
ø9.52: B + C + D + a + b + e = 10 [32] + 15 [49] + 10 [32] + 10 [32] + 5 [16]
+ 10 [32] = 60m [196ft]
ø6.35: c + d = 10 [32] + 10 [32] = 20 m [64ft]
Therefore, additional refrigerant charge
= 40m [131ft] × 0.12 kg/m [1.29 oz/ft] + 60 [196ft] × 0.06 kg/m [0.65 oz/ft]
+ 20 [64 ft] × 0.02 4 kg/m [0.26 oz/ft] + 2.5 kg [88 oz] = 11.4 kg [402 oz]
Value of
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 ~
J
Limitation of the amount of refrigerant to be charged (for PQRY-P·T(S)HMU-A/Y(S)HMU-A only)
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
Heat source unit model
Maximum amount of refrigerant
*1
kg [LBS]
*1: Amount of additional refrigerant to be charged on site
Liquid pipe size
Liquid pipe size
Total length of
Total length of
+
ø15.88 × 0.2
ø12.7 × 0.12
+
(m) × 0.2 (kg/m)
(m) × 0.12 (kg/m)
(ft) × 2.15 (oz/ft)
(ft) × 1.29 (oz/ft)
Liquid pipe size
Total length of
+ D
ø6.35 × 0.024
+
(m) × 0.024 (kg/m)
(ft) × 0.26 (oz/ft)
10 m [32ft]
At the
5 m [16ft]
10 m [32ft]
conditions
10 m [32ft]
below:
e: ø9.52 [3/8]
10 m [32ft]
D
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]
P72
P96
P120
26.3 [58]
32.8 [72]
33.8 [74]
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 27.73 kg
[978oz], round the result up to 27.8 kg [984oz].
For PQRY-P·T(S)HMU-A/Y(S)HMU-A
<Additional charge>
Additional
High-pressure
refrigerant charge
pipe size
Total length of
=
ø28.58 × 0.36
(kg)
(m) × 0.36 (kg/m)
(oz)
(ft) × 3.88 (oz/ft)
High-pressure
pipe size
Total length of
+
ø15.88 × 0.11
(m) × 0.11 (kg/m)
(ft) × 1.19 (oz/ft)
Liquid Piping Size
Total length of
ø9.52 × 0.06
+
(m) × 0.06 (kg/m)
(ft) × 0.65 (oz/ft)
BC controller
(Standard/Main)
+
3.0kg [106oz]
Total Capacity of
Connected Indoor Units
Models
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: 80
A: ø28.58 [1-1/8] 40 m [131ft] a: ø9.52 [3/8]
2: 250 B: ø9.52 [3/8]
10 m [32ft] b: ø9.52 [3/8]
3: 32
C: ø9.52 [3/8]
20 m [64ft] c: ø6.35 [1/4]
4: 40
D: ø9.52 [3/8]
5 m [16ft]
5: 32
E: ø9.52 [3/8]
5 m [16ft]
6: 63
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: A = 40 m [131ft]
ø22.2: F = 3 m [9ft]
ø19.05: G = 1 m [3ft]
ø9.52: C + D + E + a + b + f = 50 m [164ft]
ø6.35: c + d + e = 20 m [64ft]
Therefore, additional refrigerant charge
= 40m [131ft] u 0.36 kg/m [3.88 oz/ft] + 3 m [9 ft] u 0.23 kg/m [2.48 oz/ft]
+ 1 [3ft] u 0.16 kg/m [1.73 oz/ft] + 50m [164ft] u 0.06 kg/m [0.65 oz/ft]
+ 20 m [64ft] u 0.024 kg/m [0.26 oz/ft] + 2.0 kg [71 ft] + 2.0 kg [71ft]
+ 5.0 kg [176 oz]
= 27.8 kg [981 oz]
P144
P168
P192
45.5 [100]
47.0 [104]
58.2 [128]
High-pressure
High-pressure
pipe size
pipe size
Total length of
Total length of
+
+
ø22.2 × 0.23
ø19.05 × 0.16
(m) × 0.23 (kg/m)
(m) × 0.16 (kg/m)
(ft) × 2.48 (oz/ft)
(ft) × 1.73 (oz/ft)
Liquid Piping Size
Liquid Piping Size
Total length of
Total length of
ø15.88 × 0.2
ø12.7 × 0.12
+
+
(m) × 0.2 (kg/m)
(m) × 0.12 (kg/m)
(ft) × 2.16 (oz/ft)
(ft) × 1.30 (oz/ft)
Liquid Piping Size
Total length of
ø6.35 × 0.024
+
(m) × 0.024 (kg/m)
(ft) × 0.26 (oz/ft)
BC controller
BC controller
(Sub) Total Units
(Sub) Per Unit
+
1
1.0kg [36oz]
2
2.0kg [71oz]
Per Indoor Unit
~ 27
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]
5 m [16ft]
At the
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]
P216
P240
67.2 [148]
70.9 [156]
21
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