LG UHXM120BA1, Installation Manual

Page: 11 / 48

INSTALLATION OF INDOOR, OUTDOOR UNIT
ENGLISH
11
Refrigerant charge
The calculation of the additional charge should be taken in account for the length of extra pipe.
Multiple Piping Models (Unit: m)
Distributor type Models (Unit: m)
• Multiple Piping Models
Additional charge (g) = ((A Room Installation Length – Standard Length ) x 20 g/m
+ (B Room Installation Length – Standard Length ) x 20 g/m +.. )
- CF(Correction Factor) x 150
h
CF = Max. number of connectable indoor unit – Total number of connected indoor unit
• Distributor type Models
Additional charge (g) = (( Total Main piping Length - Main Standard Length ) x 50 g/m
+ (A Room Branch Length – Standard Length ) x 20 g/m
+ (B Room Branch Length – Standard Length ) x 20 g/m
+ (C Room Branch Length – Standard Length ) x 20 g/m +.. )
- CF(Correction Factor) x 100
h
CF = Max. number of connectable indoor unit – Total number of connected indoor unit
Phase Capacity(kBtu/h)
Standard
Length(m)
Max Piping for
one room(m)
Max total Piping
Length
Additional
Charge(g/m)
1 Ø
18 7.5 25 50 20
24 7.5 25 70 20
30 7.5 25 75 20
40 7.5 25 85 20
Phase Capacity(kBtu/h)
Main Piping length Branch piping length
Standard
length(m)
Additional
refrigerant(g/m)
Standard
length(m)
Additional
refrigerant(g/m)
1 Ø
40 5 50 5 20
48 5 50 5 20
56 5 50 5 20
• Total main pipe(A+B+C) = 30 m
• Each branch pipe
a = 10 m
b = 8 m
c = 5 m
d = 3 m
e = 10 m
*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 20)
- (7-5) x 100 = 1 270 g
A
Ex) Distributor type Model 1 Ø, 40 kBtu/h
A
B
C
a b c
7 k 9 k 9 k
d e
9 k
18 k