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
Contents
Total
Additional
Charge
070
~
120
For the
refrigerant
pipes
Pipe
diameter
Symbol
Total length of
liquid piping
(meter)
Refrigerant
charge per
meter
Additional
charge
(kg)
W=W11+W12
+W13
Φ6.35
W11=
×0.0
3
kg/m=
Φ9.52
W12=
×0.0
7
kg/m=
Φ12.7
W13=
×0.
12
kg/m=
For the
Indoor units
0
NOTE:
Ensure the total additional charge should not exceed the max. additional refrigerant charge quantity.
(2) Max. Additional Refrigerant Charge Quantity
Outdoor Unit
070~120
Max. Additional Refrigerant
Charge Quantity (kg)
(3) Refrigerant Charge Amount of Outdoor Unit before Shipment.
Outdoor Unit
W
0
（
kg
）
070~0
9
0
5.6
100
7.0
110~120
9.0
NOTE:
W0 is outdoor unit refrigerant charge before shipment.
(4) Record of Additional Charge
13.5
The total refrigerant charge of the system should be calculated in the following formula.
Total of Refrigerant Charge
=
W
+
W
0
The system
=
+
=
kg
27
