LG MULTI V WATER IV ARWN120LAS4, Installation Manual, Page: 40 / 79

40 Outside Unit 40 Outside Unit
Refrigerant piping system
Calculation of amount of refrigerant
The calculation of the additional charge should take account of the diameter and length of the pipe.
Additional charge (kg)
Product Charge(kg)
=
+
+
+
+
+
+
+ =
+
Total liquid pipe (m): Ø22.2mm x 0.354(kg/m)
Total liquid pipe (m): Ø25.4 mm
x 0.480(kg/m)
x 0.266(kg/m)
x 0.173(kg/m)
x 0.118(kg/m)
x 0.061(kg/m)
x 0.022(kg/m)
Total liquid pipe (m): Ø19.05mm
Total liquid pipe (m): Ø15.88mm
Total liquid pipe (m): Ø12.7mm
Total liquid pipe (m): Ø9.52mm
Total liquid pipe (m): Ø6.35mm
CF(kg)
(Correction Factor)
Total amount(kg)
If a negative result is obtained from
the calculation, no refrigerant needs
to be added.
A
A B
B
CAUTION
Outside unit
Header branch
Indoor
unit
Ex) 10HP
Additional Charge = A x 0.061 + B x 0.061 + C x 0.061
+ D x 0.061 + E x 0.022 + CF
= 50 x 0.061 + 10 x 0.061 + 10 x 0.061
+ 10 x 0.061 + 10 x 0.022 + 0(CF)
= 5.1kg
A : Ø9.52, 50m
B : Ø9.52, 10m
C : Ø9.52, 10m
D : Ø9.52, 10m
E : Ø6.35, 10m
Note:
Please refer to the additional refrigerant table for indoor units of installation manual.