Charging - LG MFL39817319 Installation Manual

Charging

Charging
n If installed total piping length is more than standard total length, additional refrigerant charging is
necessary.
Below standard total piping length, additional refrigerant charging is not required.
Outdoor Unit Max total length of all
Capacity (Btu/h pipes (A+B)/(A+B+C)/
class)
18k
24k
36k
Important:
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge
using the charge amount specified on the Unit`s specification label.
Additional charge(oz ) = (Total Installation Piping Length-Standard Total Piping Length) x 0.22
A
Ex) A4UW363FA2
h If the total additional charge value after calculation comes out to be negative, then do not
consider additional charge.
46 Multi Air Conditioner
Max length of each
pipe (A/B/C/D)
(A+B+C+D)
50(164) 25(82)
75(246) 25(82)
75(246) 25(82)
a
b
c
Min length of each
pipe (A/B/C/D)
3(9.8)
3(9.8)
3(9.8)
Each branch pipe
9k
a=82ft
b=16ft
c=49ft
9k
Additional Charge
= {(82+16+49)-98.4} x 0.22 = 10.69 oz
9k
Standard Total Piping
Additional Refrigerant
Length (No Add`l
Unit : g/m (oz/ft)
20(0.22)
20(0.22)
20(0.22)
Unit:m(ft)
refrigerant)
15(49.2)
22.5(74)
30(98.4)