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5.4
Additional Refrigerant Charge Calculation
Additional Charge of Refrigerant R410A (FSN Series)
Although refrigerant has been charged into this unit, it is required that additional refrigerant be charged according
to piping length.
A. Determine an additional refrigerant quantity according to the following procedure, and charge it into the system.
B. Record the additional refrigerant quantity to facilitate service activities thereafter.
42HP
1. Calculating Method of Additional Refrigerant Charge (W kg)
1.1 Additional Refrigerant Charge Calculation for Liquid Piping (W
See Example for Model RAS-42FSN, and fill in the following table.
Pipe Diameter
Total Piping Length
φ22.2 .....
(0)
φ19.05 ...
(20 + 5 x 3)
φ15.88 ...
(5)
φ12.7 .....
(5)
φ9.53 .....
(5 x 8)
φ6.35 .....
(10)
Example
Additional Charge W
Pipe Diameter
Total Piping Length
φ22.2 .....
φ19.05 ...
φ15.88 ...
φ12.7 .....
φ9.53 .....
φ6.35 .....
This System
Additional Charge W
1.2 Additional Refrigerant Charge Calculation for Indoor Unit (W
Additional refrigerant charge is 1 kg/unit of 8HP and 10HP indoor unit.
Additional refrigerant charge of less than 8HP indoor units are not needed.
(Example)
This System
1.3 Calculation of Additional Charge (W kg)
Put weight W
and weight W
1
Total Volume of Additional Charge
(Example)
This System
2. Charging Work
Charge refrigerant (R410A) into the system according to the instructions
described in the "Installation Manual".
3. Record of Additional Charge
Record the refrigerant charging quantity in order to facilitate maintenance and servicing activities.
Total refrigerant charge of this system is calculated in the following formula.
Total Ref. Charge of This System
This System
Table 5.5 Additional Refrigerant Charge Calculation
φ9.53x5m
φ9.53x5m
φ9.53x5m
2.5HP
4.0HP
No. 0
No. 1
φ19.05x20m
φ19.05x5m
φ19.05x5m
Additional Charge (kg)
x 0.390 = 0.00
x 0.280 = 9.80
x 0.190 = 0.95
x 0.120 = 0.60
x 0.07 = 2.80
x 0.03 = 0.30
Total = 14.45 (kg)
1
Additional Charge (kg)
x 0.390 =
x 0.280 =
x 0.190 =
x 0.120 =
x 0.07 =
x 0.03 =
Total =
1
(Total Combination unit
of 8HP and 10HP.)
W
=
0
2
W
=
2
calculated in items 1.1 and 1.2 into the following formula.
2
W = W
1
W = 14.45 + 0.0 = 14.45 kg
W =
= W
+ W
=
+
φ9.53x5m
φ9.53x5m
φ9.53x5m
5.0HP
4.0HP
5.0HP
2.5HP
No. 2
No. 3
No. 4
No. 5
φ15.88x5m
φ19.05x5m
φ12.7x5m
kg)
1
(kg)
kg)
2
unit x 1.0 kg/unit =
0.0
unit x 1.0 kg/unit =
+ W
2
+
=
kg
0
=
kg
φ9.53x5m
φ6.35x10m
φ9.53x5m
2.5HP
2.5HP
2.0HP
No. 6
No. 7
No. 8
<Table 1>
W
Outdoor Unit
Ref. Charge (kg)
RAS-34FSN
RAS-36FSN
RAS-38FSN
RAS-40FSN
RAS-42FSN
NOTE:
W
is outdoor unit ref. charge
0
before shipment.
kg
kg
Total Additional Charge W
Total Ref. Charge of This System
Date of Ref. Charge Work
Year
Month
Outdoor Unit
0
28.5
31.0
31.0
32.0
32.0
kg
kg
Day
11
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