LG ATNH126ELFC Service Manual page 54

Installation
Refrigerant Additional Charging Method
1. AUUH488C
There is not additional charging of refrigerant by main pipe of 30m below.
For additional charging method, see below table.
Synchro Refrigerant Additional charging (kg)
Duo Refrigerant = (L1-30) x A + (L2+L3-20) x 0.03
Trio
Refrigerant = (L1-30) x A + (L2+L3+L4-20) x 0.03
Refrigerant = (L1-30) x A + (L2+L3+L4+L5-20) x 0.03
Quartet
(L1=Main Pipe, L2~L5 : Branch Pipe)
Note: If total additional charge value after calculation comes out to be negative, then do not consider additional
charge.
CAUTION:
• Rated performance for refrigerant line length of:7.5m
• Capacity is based on standard length and maximum allowance length is on the basis of
reliability.
• Improper refrigerant charge may result in abnormal cycle.
• Oil trap should be installed every 10 meters.
2. AUUH728C/AUUH1008C
For additional charging method, see below table.
Synchro Refrigerant Additional charging (kg)
Duo Refrigerant = (L1 - 5) x 0.05 + (L2 + L3 - 20) x A
Trio
Refrigerant = (L1 - 5) x 0.05 + (L2 + L3 + L4 - 20) x A
Refrigerant = (L1 - 5) x 0.05 + (L2 + L3 + L4 + L5 - 20) x A
Quartet
(L1=Main Pipe, L2~L5 : Branch Pipe)
Note: If total additional charge value after calculation comes out to be negative, then do not consider additional
charge.
CAUTION:
• Rated performance for refrigerant line length of:7.5m
• Capacity is based on standard length and maximum allowance length is on the basis of
reliability.
• Improper refrigerant charge may result in abnormal cycle.
• Oil trap should be installed every 10 meters.
54 Synchro Air Conditioner
Model
AUUH488C
Refrigerant Branch
A
Pipe (mm)
Ø 6.35 0.03 kg/m
Ø 9.52 0.05 kg/m
A
0.07