LG A3UW186FA3 Installation Manual page 9

Refrigerant charge
The calculation of the additional charge should be taken in account for the length of extra pipe.
Multiple Piping Models
Model
A3UW186FA3[FM19AH]
A3UW216FA3/4[FM21AH]
A4UW246FA3/4[FM25AH]
A4UW276FA3[FM27AH]
A5UW306FA3[FM30AH]
A5UW406FA3[FM38AH]
Distributor type Models
Phase Model
A7UW406FA2/3[FM40AH]
1Ø A8UW486FA3[FM48AH]
A9UW566FA3[FM56AH]
A7UW428FA3[FM41AH]
3Ø A8UW488FA3[FM49AH]
A9UW548FA3[FM57AH]
I Multiple Piping Models
Additional charge (g) = ((A Room Installation Length – Standard Length ) x 20g/m
+ (B Room Installation Length – Standard Length ) x 20g/m +.. )
- CF(Correction Factor) x 150
❈ CF = Max. number of connectable indoor unit – Total number of connected indoor unit
I Distributor type Models
Additional charge (g) = (( Total Main piping Length - Main Standard Length ) x 50g/m
+ (A Room Branch Length – Standard Length ) x 20g/m
+ (B Room Branch Length – Standard Length ) x 20g/m
+ (C Room Branch Length – Standard Length ) x 20g/m +.. )
- CF(Correction Factor) x 100
❈ CF = Max. number of connectable indoor unit – Total number of connected indoor unit
Additional Charge Calculation Example-1
Ex) A7UW406FA3
A
A
C
a
7k
B
Standard Max piping for
length(m) one room(m)
7.5
7.5
7.5
7.5
7.5
7.5
Main Piping length
Standard
length(m)
5
5
5
5
5
5
• Total main pipe(A+B+C) = 30m
• Each branch pipe
a = 10m
b = 8m
c = 5m
d = 3m
e = 10m
b c
❖ Additional Charge
9k 9k
=((30-5) x 50 + (10-5) x 20 + (8-5) x 20
+ (5-5) x 20 + (3-5) x 20 + (10-5) x 20)
- (7-5) x 100 = 1270g
e
d
18k
9k
Installation of Indoor, Outdoor Unit
Max total Piping
Length(m)
25 40
25 50
25 70
25 70
25 75
25 85
Additional Standard
refrigerant(g/m) length(m)
50
50
50
50
50
50
Additional
Charge(g/m)
20
20
20
20
20
20
Branch piping length
Additional
refrigerant(g/m)
5 20
5 20
5 20
5 20
5 20
5 20
Installation Manual 9