Hitachi RAS-(4-12)HNP(1)(E) - Page 105

3 Piping work and
refrigerant charge
91
SMGB0087 rev.0 - 12/2013
3
3 Permissible range for existing air-conditioning pipes (pipe length in the case of “without
cleaning process”
IVX Premium series
Liquid Ø6.35 Ø9.52 Ø12.70 Ø15.88
Thickness
(mm)
0.8 0.8 0.8 1.0
Gas
Ø9.52 Ø12.70 Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø28.58 Ø22.20 Ø25.40 Ø28.58
Thickness
(mm)
0.8 0.8 1.0 1.0 0.8 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Material
soft-
annealed
x x x x x x x x x
Material
drawn
x x x x x x x x x x x
Perfor-
mance
capacity (m)
2HP 15
(1)
50 30 - 15
(3)
15
(3)
- - - - - - - - - - -
2.5HP - 50 30 - 20
(3)
20
(3)
- - - - - - - - - - -
3HP -
30
(1) (2)
30
(2)
- 30
(1)
50 - - - - - - - - - - -
4-5-6HP - - 5
(2)
5
(2)
40
(1)
50 50
(4)
- - 30
(3)
30
(3) (4)
- - - - - -
8HP - - - - - -
50
(1) (4)
50
(1)
50 -
50
(1) (3) (4)
50
(1) (3)
50
(3)
-
50
(1) (3)
50
(3)
-
10-12HP - - - - - - - - - - - 50
(1)
50 50
50
(1) (3)
50
(3)
50
(3)
(1).Reducing gas pipe size will lower cooling capacity due to larger pressure loss in gas piping and narrow operation range.
(2).Reducing liquid pipe size will narrow operation range due to indoor unit relation with expansion valve capacity.
(3).Increasing liquid pipe size will require additional refrigerant charge.
(4).When using Ø 19.05 gas pipe (soft-annealed), please switch ON DSW2-4# in the Outdoor Unit PCB.
Standard
IVX Standard series
Liquid Ø6.35 Ø9.52 Ø12.70 Ø15.88
Thickness
(mm)
0.8 0.8 0.8 1.0
Gas
Ø9.52 Ø12.70 Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø28.58 Ø22.20 Ø25.40 Ø28.58
Thickness
(mm)
0.8 0.8 1.0 1.0 0.8 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Material
soft-
annealed
x x x x x x x x x
Material
drawn
x x x x x x x x x x x
Perfor-
mance
capacity
(m)
3HP -
30
(1) (2)
30
(2)
- 30
(1)
50 - - - - - - - - - - -
4HP - - 5
(2)
5
(2)
40
(1)
50 50
(2)
30
(3)
30
(3) (4)
- - - - - -
5-6HP - - 5
(2)
5
(2)
40
(1)
50 50
(2)
30
(3)
30
(3) (4)
- - - - - -
8HP - - - - - -
50
(1) (4)
50
(1)
50 -
50
(1) (3) (4)
50
(1) (3)
50
(3)
-
50
(1) (3)
50
(3)
-
10-12HP - - - - - - - - - - - 50
(1)
50 50
50
(1) (3)
50
(3)
50
(3)
(1).Reducing gas pipe size will lower cooling capacity due to larger pressure loss in gas piping and narrow operation range.
(2).Reducing liquid pipe size will narrow operation range due to indoor unit relation with expansion valve capacity.
(3).Increasing liquid pipe size will require additional refrigerant charge.
(4).When using Ø 19.05 gas pipe (soft.annealed), please switch ON DSW2-4# in the Outdoor Unit PCB.
Standard