The amount of Refrigerant
The calculation of the additional charge should take into account the length of pipe and CF(correc-
tion Factor) value of indoor unit.
Additional charge(kg)
=
Total liquid pipe : Ø25.4 mm (1.0 inch)
x 0.480 kg/m (0.323 lbs/ft)
+
Total liquid pipe : Ø22.2 mm (7/8 inch)
x 0.354 kg/m (0.238 lbs/ft)
+
Total liquid pipe : Ø19.05 mm (3/4 inch)
x 0.266 kg/m (0.179 lbs/ft)
+
Total liquid pipe : Ø15.88 mm (5/8 inch)
x 0.173 kg/m (0.116 lbs/ft)
+
Total liquid pipe : Ø12.7 mm (1/2inch)
x 0.118 kg/m (0.079 lbs/ft)
+
Total liquid pipe : Ø9.52 mm (3/8inch)
x 0.061 kg/m (0.041 lbs/ft)
+
Total liquid pipe : Ø6.35 mm (1/4 inch)
x 0.022 kg/m (0.015 lbs/ft)
+
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 = 2.12kg(4.67lbs)
Attach the additional refrigerant table of IDU.
CAUTION
Use only 2-series of indoor unit. Ex) ARNU***2/A
!
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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
ENGLISH