LG A2UW146FA0, Service Manual

Page: 82 / 268

82 Multi type Air Conditioner
Installation
2.3 Refrigerant charge
The calculation of the additional charge should be taken in account for the length of pipe.
• Total main pipe(A+B+C) = 30m
• Each branch pipe
a = 10m
b = 8m
c = 5m
d = 3m
e = 10m
• CF = 6-5 = 1
❖
Additional Charge
= (30-5) x 50
+ (10-5) x 20
+ (8-5) x 20
+ (5-5) x 20
+ (3-5) x 20
+ (10-5) x 30
- (1 x 100)
= 1250+100+60+0-40+150-100 =
1420 g
A
ex) A6UW406FA0
A
B
C
a b c
7k 9k 9k
d
e
9k
18k
Caution
Regulation for refrigerant leakage(in Europe)
: the amount of refrigerant leakage should satisfy the following equation for human safety.
Total amount of refrigerant in the system
0.3 ( kg / m 3 )
Volume of the room at which indoor unit of the least capacity is installed
2.2 Refrigerant charge
The calculation of the additional charge should be taken in account for the length of pipe.
A6UW406FA0 charge = 4100g
A7UW486FA0 charge = 7100g
A8UW566FA0 charge = 7100g
Additional charge (g)
A
B
Total Main pipe length - rated length x 50g/m
7,9,12 k Branch pipe length - rated length
x 20g/m
18,24 k Branch pipe length - rated length
x 30g/m
=
+
+
Total Amount (g) = A B
+
A4UW306FA1 charge = 2500g
Additional charge (g)
Total Main pipe length - rated length
x 40g/m
7,9,12 k Branch pipe length - rated length
x 20g/m
18,24 k Branch pipe length - rated length
x 30g/m
=
+
+
• Rated length = 5m,
• CF = Max. number of connectable indoor unit
✽
Note : If total additional charge value after calculation comes out to be negative, then do not
consider additional charge.
– Total number of connected indoor unit
CF(Correction Factor) x 100
-
30,36 k Branch pipe length - rated length
x 35g/m +