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(5) Refrigerant charging calculation (PWFY-AU with R2 system)
It is needed to add extra refrigerant if the system is under the following conditions.
See the attachment for how to decide the amount of refrigerant to be added to each outdoor unit.
The graph below shows an example.
BC to PWFY
pipe length [m
]
600
550
500
450
400
350
300
100
250
200
150
50
0
45
85
95
105
65
75
55
System total refrigerant amount [kg]
Extra charge amount (kg): BC to PWFY pipe length (m) × 0.1
Need to add refrigerant
Main pipe: 40m(BC) + 20m(BS)
PWFY: P200 x 4, Pipe 25m each
IC: P50 x 11, Pipe 20m each (150%)
Main pipe: 40m
PWFY: P200 x 2, Pipe 25m each
IC: P50 x 10, Pipe 20m each (100%)
O/U:P900
Total capacity:150%
Main pipe: 40m
PWFY: P200 x 4, Pipe 25m each
Main pipe: 40m
PWFY: P200 x 4, Pipe 12.5m each
A
C
D
B
A
B
C
D
PURY-P200
㪃㩷
PURY-EP200
PURY-P250
㪃㩷
PURY-EP250
0
16
16
50
100
150
200
250
System refrigerant [kg]
Total PWFY Pipe length [m
]
OK Zone
OK Zone
0
50
100
150
200
250
300
System refrigerant [kg]
Total PWFY Pipe length [m
]
18
18
20
24
22
26
28
30
20
24
22
26 28 30
34 36 38 40
32
20 22 24
28
26
30 32 34
38 40 42 44
36
Additional
Refrigerant
Additional
Refrigerant
PURY-P300
㪃㩷
PURY-EP300
PURY-P350
㪃㩷
PURY-EP350
System refrigerant [kg]
Total PWFY Pipe length [m
]
System refrigerant [kg]
Total PWFY Pipe length [m
]
16
OK Zone
0
50
100
150
200
250
300
18 20
24
22
26 28 30
34 36 38 40
32
Additional
Refrigerant
0
50
100
150
200
250
300
350
400
OK Zone
Additional
Refrigerant
