Multi V S Outdoor Unit
7. Refrigerant Piping System
18
Installation of Outdoor Units
7.2 Indoor Unit Connection
Indoor Unit connecting pipe from branch (a,b,c,d,e,f)
7.3 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.
Note
For CF value (additional refrigerant) table of indoor units, please refer to PDB of indoor unit.
Indoor Unit capacity [kW(Btu/h)] Liquid pipe [mm(inch)] Gas pipe [mm(inch)]
≤ 5.6(19,100)
Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
< 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)
≤ 28.0(95,900)
Ø9.52(3/8) Ø22.2(7/8)
• Bending radius should be at least twice the diameter of the pipe.
• Bend pipe after 500mm or more from branch(or header).
Do not bend U type.
It may cause Performance unsatisfactory or noise.
Additional charge(kg) = Total liquid pipe : Ø25.4 mm × 0.480(kg/m)
+ Total liquid pipe : Ø22.2 mm × 0.354(kg/m)
+ Total liquid pipe : Ø19.05 mm × 0.266(kg/m)
+ Total liquid pipe : Ø15.88 mm × 0.173(kg/m)
+ Total liquid pipe : Ø12.7 mm × 0.118(kg/m)
+ Total liquid pipe : Ø9.52 mm × 0.061(kg/m)
+ Total liquid pipe : Ø6.35 mm × 0.022(kg/m)
+ Number of installed HR units(2,3,4port) × 0.500(kg)
+ Number of installed HR units(6,8port) × 1.000(kg)
+ CF value of indoor unit(kg/EA)
500mm or more
500mm or more
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