LG AMNH076LQL0 Service Manual page 77

1.3 Refrigerant charge
The calculation of the additional charge should be taken in account for the length of pipe.
ex) A7UW428FA0
A
A
B
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
Volume of the room at which indoor unit of the least capacity is installed
❐ If the above equation can not be satisfied, then follow the following steps.
- Selection of air conditioning system: select one of the next
1. Effective opening part Installation
2. Reconfirmation of outdoor unit capacity and piping length
3. Reduction of the amount of refrigerant
4. 2 or more security device installation of alarm for gas leakage
- Change indoor unit type
: installation position should be over 2m from the floor (Wall mounted type ¡ Cassette type)
- Adoption of ventilation system
: choose ordinary ventilation system or building ventilation system
- Limitation in piping work
: design for earthquake-proof and prevention against thermal stress
C
a b
7k 9k
d
9k
• Total main pipe(A+B+C) = 30m
• Each branch pipe
a = 10m
b = 8m
c = 5m
d = 3m
e = 10m
c
❖ Additional Charge
9k
= (30-10) x 50
+ ((10+8+5+3+10)-35) x 25
= 1000 + 25 = 1025g
e
18k
Installation
0.3 ( kg / m 3 )
Service Manual 77