Table of Contents
Advertisement
7. Air-Tight Test and Additional Refrigerant Charge
7.3 Additional Refrigerant Charge Calculation
Additional Refrigerant Charge Calculation
Although refrigerant has been charged into this unit in advance, additional refrigerant charge is required according to piping length.
Determine the additional refrigerant quantity according to the following procedure, and charge the system with it.
Record the additional refrigerant quantity to facilitate maintenance and servicing activities thereafter.
(1) Calculating Method of Additional Refrigerant Charge ( W kg )
Symbol
No.
1
W1
Additional Refrigerant Charge Calculation for Liquid Piping ( W1 kg )
Pipe Diameter (mm) Total Piping Length (m) Refrigerant Amount for 1m Pipe (kg/m) Additional Ref. Charge (kg)
φ28.58
φ25.4
φ22.2
φ19.05
φ15.88
φ12.7
φ9.52
φ6.35
NOTE:
Round off the numbers two decimal places.
2
W2
Additional Refrigerant Charge Calculation for Indoor Unit ( W2 kg )
The additional refrigerant charge is required depending on the number of connected indoor units
and ratio of indoor unit connection capacity ( Indoor Unit Total Capacity / Outdoor Unit Capacity ).
Additional Refrigerant Charge Quantity ( kg )
Indoor Unit Capacity (HP)
NOTE:
1. The table above shows the quantity of additional refrigerant charge per indoor unit.
e.g. 12 indoor units of 1.5 hp are connected and I.U. Capacity Ratio is 95% or more.
0.5kg/unit × 12 unit ＝ 6.0kg
2. The quantity of additional refrigerant based on the above calculation is must not be exceed the following formula.
Maximum additional refrigerant charge = ( "Total Indoor Unit Capacity (HP)" × 0.112 ) kg or 13.2kg whitchever is bigger.
( Round off the numbers two decimal places. )
3
W3
The additional refrigerant charge is required depending on the number of connected outdoor units. ( W3 kg )
Select adequate refrigerant charge from the table below.
Outdoor Unit Capacity (HP)
RAS-*(H,R)NCC(L,R)(I,W)
NOTE:
The table above shows the quantity of additional refrigerant charge per outdoor unit.
e.g. RAS-480HNCCLW is 2 outdoor unit of 24HP connected.
0.8kg/unit × 2 unit ＝ 1.6kg
4
W4
Additional Refrigerant Charge Quantity for Each CH-Box ( Multiple Branch Type ) Connected ( W4 kg )
If CH-Boxes ( multiple branch type ) are connected, additional refrigerant charge is required.
Select adequate refrigerant charge from the table below.
CH-Box Model
Additional Ref. Charge (kg)
5
W
NOTES:
1. Some refrigerant charge calculations differ when installing Wall Type ( RPK-FSNH4M Series ) with expansion valve kit.
Refer to "Installation & Maintenance Manual".
2. Ensure that the total additional refrigerant charge quantity ( W ) should not exceed the max. additional refrigerant charge quantity shown in the table below "Table(※)".
(2) Charging Work
Charge the system with refrigerant R410A according to
"Installation & Maintenance Manual".
(3) Recording of Additional Refrigerant Charge
Total refrigerant charge of this system is calculated in
the following formula.
Total Ref. Chage
=
W
This System
=
Total Additional Ref. Charge:
Total Ref. Charge:
Date of Ref.Charge Work:
※Attach this label on the service cover of the outdoor unit
after recording the calculation result in the blank above.
NOTE:
・W0 is outdoor unit Ref. charge before shipment.
・In case of the combination of the base units, calculate the total
ref. charge before shipment of the outdoor units to be combined.
60
Table 7.1 Additional Refrigerant Charge Calculation
Total Additional Ref. Charge For Liquid Piping
I.U. Capacity Ratio is less than 95%
0.4-1.3
1.5-2.0
2.3-3.3
4.0-6.0
8.0-12.0
16.0
20.0
Additional Charge Ref. (kg)/unit
24
26
0.8
1.8
CH-AP04MSSX CH-AP08MSSX CH-AP12MSSX
0.1
+
W0
kg
+
=
W
kg
kg
/
/
Contents
×0.67＝
×0.52＝
×0.36＝
×0.26＝
×0.17＝
×0.11＝
×0.056＝
×0.024＝
Additional Charge Ref. (kg)/unit
I.U. Capacity Ratio is 95% or more
0.0
0.0
0.0
0.0
0.0
0.0
0.0
28
※ W3 is not suitable for cooling only, and W3 defaults to 0kg
1.8
※ W4 is not suitable for cooling only, and W4 defaults to 0kg
CH-AP16MSSX
0.2
0.3
0.4
Calculation of Additional Ref. Charge ( W1 + W2 +W3 + W4 ) =
Table(※) < Max. Additional Refrigerant Charge Quantity >
Outdoor Unit Capacity (HP)
8,10
RAS-*CNCCL(I,W)
28.0
< Ref. Charge Amount of O.U Before Shipment (W0) kg >
Outdoor Unit Capacity (HP)
8
10
RAS-*CNCCL(I,W)
5.6
5.6
0.3
0.5
0.9
1.1
1.4
1.5
2.0
Max. Additional Ref. Charge (kg)
12,14
16‐20
22,24
26‐30
32‐42
36.0
40.0
46.0
56.0
63.0
W0 Outdoor Unit Ref. Charge (kg)
12
14
16
18
20
22
8.3
8.3
9.5
10.2
10.2
11.2
Additional
Ref. Charge
kg
kg
kg
kg
kg
44‐66
68‐88 90‐120
63.0
73.0
93
24
26
28
30
11.6
11.6 11.6
11.6
Advertisement
Table of Contents
