Installation guide

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 0.480kg/m(0.323(lbs/ft))
+ Total liquid pipe : Ø22.2 mm (7/8 inch) x 0.354kg/m(0.238(lbs/ft))
+ Total liquid pipe : Ø19.05 mm (3/4 inch) x 0.266kg/m(0.179(lbs/ft))
+ Total liquid pipe : Ø15.88 mm (5/8 inch) x 0.173kg/m(0.116(lbs/ft))
+ Total liquid pipe : Ø12.7 mm (1/2 inch) x 0.118kg/m(0.079(lbs/ft))
+ Total liquid pipe : Ø9.52 mm (3/8 inch) x 0.061kg/m(0.041(lbs/ft))
+ Total liquid pipe : Ø6.35 mm (1/4 inch) x 0.022kg/m(0.015(lbs/ft))
+ Number of installed HR unit x 5kg(1.1lbs)
+ 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
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