Hitachi RAS-4-HNCE - Combinations of Piping Size and Piping Length

3. Piping work and refrigerant charge
66
SMGB0079 rev.0 - 01/2013
3.3.4 Combinations of piping size and piping length
IVX Premium series
Liquid Ø6.35 Ø9.52 Ø12.70 Ø15.88
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 Ø28.60 Ø22.20 Ø25.40 Ø28.60
Performance
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)
75 50
(4)
- - 30
(3)
30
(3) (4)
- - - - - -
8 HP - - - - - -
50
(1)(4)(6)
50
(1)(6)
70
(5)(7)
-
50
(1)(3)(4)
50
(1)(3)
100 -
50
(1)(3)
50
(3)
-
10 - 12 HP - - - - - - - - - - - 50
(1)
100 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 Ø19.05 gas pipe (soft-annealed), please switch ON DSW2-4# in the Outdoor Unit PCB.
(5) In case that pipe length exceeds 70m in 8 HP, please use a
Ø12.7 pipe as a liquid pipe.
(6).In case of exceeding the recommended number of connected Indoor Units of 8 HP (more than 5 Units), please use a Ø12.7 pipe as a liquid
Standard
IVX Standard series
Liquid Ø6.35 Ø9.52 Ø12.70 Ø15.88
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 Ø28.60 Ø22.20 Ø25.40 Ø28.60
Performance
capacity (m)
3 HP -
30
(1)(2)
30
(2)
- 30
(1)
50 - - - - - - - - - - -
4 HP - - 5
(2)
5
(2)
40
(1)
70 50
(4)
- - 30
(3)
30
(3) (4)
- - - - - -
5 - 6 HP - - 5
(2)
5
(2)
40
(1)
75 50
(4)
- - 30
(3)
30
(3) (4)
- - - - - -
8 HP - - - - - -
50
(1)(4)
50
(1)
70
(5)
-
50
(1)(3)(4)
50
(1)(3)
100
50
(1)(3)
50
(3)
10 - 12 HP - - - - - - - - - - - 50
(1)
100 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.
(5) In case that pipe length exceeds 70m in 8 HP, please use a Ø12.7 pipe as a liquid pipe.
(6).In case of exceeding the recommended number of connected Indoor Units of 8 HP (more than 5 Units), please use a Ø12.7 pipe as a liquid
Standard