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4.7 Additional Refrigerant Charge Calculation
Although this unit has been charged the refrigerant, additional refrigerant charge is required on the site.
Determine additional quantity of refrigerant required according to the following table, and charge it into the
system.
(1) Calculating the method of Additional Refrigerant Charge
Model
Item
For the
refrigerant
RAS-3.0~6.0
pipes
HNSKQ
For the
Indoor units
For the
refrigerant
pipes
RAS-6.5~7.0
HNSKQ
For the
round-way
cassette
indoor units
For the other
indoor units
NOTE:
Ensure the total additional charge should not exceed the max. additional refrigerant charge quantity.
(2) Max. Additional Refrigerant Charge Quantity
Max. Additional Refrigerant
(3) Refrigerant Charge Amount of Outdoor Unit before Shipment.
NOTE:
W0 is outdoor unit refrigerant charge before shipment.
(4) Record of Additional Charge
Pipe
Symbol
diameter
Φ6.35
W11=
Φ9.53
W12=
Φ12.7
W13=
Pipe
Symbol
diameter
Φ6.35
W11=
Φ9.53
W12=
Φ12.7
W13=
Model
Symbol
28~45
W21
50~71
W22
80~160
W23 =
Outdoor Unit
Charge Quantity (kg)
Outdoor Unit
RAS-3.0HNSKQ
RAS-3.5~4.0HNSKQ
RAS-4.5~6.0HNSKQ
RAS-6.5HNSKQ
RAS-7.0HNSKQ
Contents
Total length of
liquid piping
(meter)
0
Total length of
liquid piping
(meter)
Numbers
(Q'ty)
=
=
0
RAS-3.0~
RAS-4.5~
4.0HNSKQ
6.0HNSKQ
3.1
W
29
Refrigerant
Additional
charge per
charge
meter
(kg)
×0.020kg/m=
×0.050kg/m=
×0.085kg/m=
Refrigerant
Additional
charge per
charge
meter
(kg)
×0.020kg/m=
×0.059kg/m=
×0.120kg/m=
Refrigerant
Additional
charge per
charge
unit
(kg)
×0.23kg/pcs
=
×0.29kg/pcs
=
×0.47kg/pcs =
RAS-6.5~
7.0HNSKQ
2.7
7.9
（kg）
0
2.5
3.1
4.0
5.5
5.9
Total
Additional
Charge
W=W11+W12
+W13
W=W11+W12
+W13+W21
+W22+W23
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