LG Multi F A2UW14GFA0 Engineering Product Data Book page 350

3. Installation of outdoor unit
Additional refrigerant charge calculation example - 1
Ex) A5UW30GFA0[MU5M30 U42]
Additional refrigerant charge calculation example - 2
A
55 _ Heat pump
50Hz/R410A
a
b
c
d
Ex) A8UW48GFA0 [FM48AH U32]
BD
C
a b
18k 9k
B
BD
d
9k
5k
• Each branch pipe
a = 5m
b = 10m
7k
c = 15m
d = 25m
9k
❖ Additional Charge
12k
= (5-7.5) x 20
+ (10-7.5) x 20
+ (15-7.5) x 20
+ (25-7.5) x 20
– (5-4) x 150
= 0+50+150+350-150 = 400g
• Total main pipe(A+B+C) = 20m
• Each branch pipe
a = 15m
b = 5m
c = 5m
d = 3m
e = 7m
❖ Additional Charge
c
= (20-5) x 50
7k
+ (15-5) x 20
+ (5-5) x 20
+ (5-5) x 20
+ (3-5) x 20
e
+ (7-5) x 20
18k
– (8-5) x 100
= 750+200+0+0+0+50-300 = 700g