LG ARUN038GS2 Installation Manual page 34

Refrigerant piping installation
The Amount of Refrigerant
The calculation of the additional charge should take account of the length of pipe.
Product charge(1unit)(kg(lbs))
A
B
Additional charge (kg(lbs))
=
Total liquid pipe (m(ft)): Ø22.2mm(7/8inch)
+
Total liquid pipe (m(ft)): Ø19.05mm(3/4inch)
+
Total liquid pipe (m(ft)): Ø15.88mm(5/8inch)
+
Total liquid pipe (m(ft)): Ø12.7mm(1/2inch)
+
Total liquid pipe (m(ft)): Ø9.52mm(3/8inch)
+
Total liquid pipe (m(ft)): Ø6.35mm(1/4inch)
+
Number of installed HR units
+
CF(kg(lbs)) (Correction factor)
Total amount(kg(lbs))
CAUTION
If a negative result is obtained from
the calculation, no refrigerant needs
to be added.
HP(Ton)
Product Charge(kg(lbs))
CF(kg(lbs))
HP(Ton)
Product Charge(kg(lbs))
CF(kg(lbs))
34 Outdoor Unit
x 0.237 lbs/ft
x 0.178 lbs/ft
x 0.116 lbs/ft
x 0.079 lbs/ft
x 0.041 lbs/ft
x 0.015 lbs/ft
x 1.1 lbs
= +
A B
8(6.5) 10(8.0) 12(9.5)
8 8 8
(17.6) (17.6) (17.6)
-1 0 1
(-2.2) (0) (2.2)
30(24.0) 32(25.5) 34(27.0)
16 16 24
(35.2) (35.2) (52.8)
5(11.0) 6(13.2) 2(4.4)
Ex) 10HP
Outdoor unit
HR unit (1EA)
Indoor unit
A: Ø12.7(1/2), 50m(164ft)
B: Ø9.52(3/8), 10m(33ft)
C: Ø9.52(3/8), 10m(33ft)
D: Ø9.52(3/8),10m(33ft)
E: Ø6.35(1/4), 10m(33ft)
Additional Charge = A x 0.061 + B x 0.061 + C x 0.061
+ (a+b+c+d+e) x 0.022 + CF
= 40 x 0.061 + 20 x 0.061 + 20 x 0.061
+ (10 x 5) x 0.022 + 0.5(HR)+0(CF)
= 6.48(kg)
Additional Charge = A x 0.061 + B x 0.061 + C x 0.061
+(a + b + c + d + e) x 0.022 + CF
= 131 x 0.041 + 65.6 x 0.041 + 65.6 x 0.041
+ (32.8 x 5) x 0.015 +1.1(HR)+0(CF)
= 14.3(lbs)
14(11.0) 16(12.5) 18(14.5)
8 8 16
(17.6) (17.6) (35.3)
2 3 -1
(4.4) (6.6) (-2.2)
36(28.5) 38(30.0) 40(32.0)
24 24
(52.8) (52.8) (52.8)
3(6.6) 4(8.8) 5(11.0)
20(16.0) 22(17.5) 24(19.0)
16 16 16
(35.3) (35.3) (35.3)
0 1 2
(0) (2.2) (4.4)
42(33.5) 44(35.0)
24 24 24
(52.8) (52.8)
6(13.2) 7(15.4) 8(17.6)
26(20.5) 28(22.5)
16 16
(35.2) (35.2)
3(6.6) 4(8.8)
46(36.5) 48(38.0)
24 24
(52.8) (52.8)
9(19.8)