LG multi V ARUN Series Installation Manual page 42

Pipe connections between indoor and outdoor unit
u The amount of Refrigerant
The calculation of the additional charge should take into account the length of pipe and CF(correction
Factor) value of indoor unit.
Additional charge(kg)
CAUTION
Use only 2-series of indoor unit. Ex) ARNU***2
42 Outdoor Unit
Total liquid pipe
=
:Ø25.4 mm
Total liquid pipe
+
:Ø22.2 mm
Total liquid pipe
+
:Ø19.05 mm
Total liquid pipe
+
:Ø15.88 mm
Total liquid pipe
+
:Ø12.7 mm
Total liquid pipe
+
:Ø9.52 mm
Total liquid pipe
+
:Ø6.35 mm
CF value of indoor unit
+
Amount refrigerant of Indoor units
Example) 4Way Ceiling Cassette 14.5kW -1ea
Ceiling concealed Duct 7.3kW-2ea
Wall Mounted 2.3kW-4ea
CF = 0.64 × 1 + 0.26 × 2 + 0.24 × 4 = 2.12 kg