LG MULTI V MINI ARUN Série Guide D'installation page 30

Refrigerant Piping
The Amount of Refrigerant
1. Normal condition
The calculation of the additional charge should take into account the length of pipe.
Product Charge(kg(lbs))
A
B
Additional charge(kg(lbs))
=
Total liquid pipe (m(ft))
Additional refrigerant charge
x
amount per liquid pipe 1m(3.3ft)
(Table 1)
+
Correction Factor (kg(lbs))
(Table 2)
Total amount(kg(lbs))
Table 1
Pipe diameter at
Ø6.35(1/4)
liquid side(mm(inch))
Additional
Refrigerant
amount (lbs/ft)
2. Special condition
In case of the No. of CST TE/RAC SE models are over than 50% of the connected indoor units when
the total No. of connected indoor units are over than 50% of the max. connectable indoor units.
I Additional refrigerant charging amount (kg(lbs))
= (A x + B x ß) - (AVG x ß)
• A = Total No. of TE and SE Indoor units,
• B = Total No. of except TE and SE Indoor units, ß = 0.3
• AVG = 50% of Max. No. of connectable Indoor units.
Example)
1) Installation Information
- Outdoor unit : 5HP
- Total indoor units : 6 units (TE 3 units, SE 2 units, BH 1 unit)
2) Information from PDB
- Max. No. of connectable indoor units : 8 units
- Calculated additional refrigerant amount = 2kg(4.4lbs)
3) Additional refrigerant charging amount
= (5 units x 0.5+1 unit x 0.3) - (5 units x 0.3) = 1.3kg(2.9lbs)
Revised the total refrigerant charging amount = 2kg(4.4lbs) +1.3kg(2.9lbs)
30 Outdoor Unit
= +
A B
Ø9.52(3/8) Ø12.7(1/2) Ø15.88(5/8)
0.015 0.041 0.079
Example : 5 HP
L1
L1 Ø9.52:10m(32.8ft) L2 Ø9.52:10m(32.8ft)
a Ø9.52:3m(9.8ft) b Ø6.35:3m(9.8ft)
Additional charge amount R (kg)
= (Lx x 0.022kg/m) + (Ly x 0.061kg/m) + Correction factor
= (12 x 0.022kg/m) + (28 x 0.061kg/m) + 0
= 1.972
Additional charge amount R (Ibs)
= (Lx x 0.015kg/m) + (Ly x 0.041kg/m) + Correction factor
= (39 x 0.015kg/m) + (92 x 0.041kg/m) + 0
= 4.357
Ø19.05(3/4) Ø22.2(7/8)
0.116 0.178 0.237
= 0.5
=3.3kg(7.3lbs)
L2 L3
a b c
L3 Ø9.52:5m(16.4ft)
c Ø6.35:4m(13.1ft)
Lx : Real total length of liquid pipe
Ø6.35mm(1/4inch)
Ly : Real total length of liquid pipe
Ø9.52(mm)(3/8inch)
Table 2
HP
PRODUCT CHARGE(kg(Ibs))
3.7(8.2)
CF(kg(Ibs))
-0.5(-1.1)
d
d Ø6.35:5m(16.4ft)
4 5
3.7(8.2)
0(0)