Combinations Of Piping Size And Piping Length - Hitachi RAS-2-HVNP Service Manual

3. Piping work and refrigerant charge
3.3.4 Combinations of piping size and piping length
IVX Premium series
Liquid Ø6.35
Gas
Ø9.52 Ø12.70
Performance
capacity
2 HP 15 50
(1)
2.5 HP - 50
30
3 HP -
(1)(2)
4 - 5 - 6
- -
HP
8 HP - -
10 - 12 HP - -
(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
(6).In case of exceeding the recommended number of connected Indoor Units of 8 HP (more than 5 Units), please use a
Standard
IVX Standard series
Liquid Ø6.35
Gas
Ø9.52 Ø12.70
Performance
capacity
30
3 HP -
(1)(2)
4 HP - -
5 - 6 HP - -
8 HP - -
10 - 12 HP - -
(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
(6).In case of exceeding the recommended number of connected Indoor Units of 8 HP (more than 5 Units), please use a
Standard
66
Ø9.52
Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05
30 - 15 15
(3) (3)
30 - 20 20
(3) (3)
30 - 30 50
(2) (1)
5 5 40 75 50
(2) (2) (1)
- - - -
(1)(4)(6)
- - - -
12.7 pipe as a liquid pipe.
Ø
Ø9.52
Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05
30 - 30 50
(2) (1)
5 5 40 70 50
(2) (2) (1)
5 5 40 75 50
(2) (2) (1)
- - - -
(1)(4)
- - - -
12.7 pipe as a liquid pipe.
Ø
SMGB0079 rev.0 - 01/2013
Ø22.20 Ø25.40 Ø15.88 Ø19.05
- - - -
- - - -
- - - -
30
- - 30
(4) (3)
(3) (4)
50 50 70 50
-
(1)(6) (5)(7) (1)(3)(4)
- - - -
Ø22.20 Ø25.40 Ø15.88 Ø19.05
- - - -
30
- - 30
(4) (3)
(3) (4)
30
- - 30
(4) (3)
(3) (4)
50 50 70 50
-
(1) (5) (1)(3)(4)
- - - -
Ø12.70
Ø22.20 Ø25.40 Ø28.60 Ø22.20
- - - - -
- - - - -
- - - - -
- - - -
50 50
100 -
(1)(3) (1)(3)
50
- 50 100 50
(1)
(1)(3)
12.7 pipe as a liquid
Ø
Ø12.70
Ø22.20 Ø25.40 Ø28.60 Ø22.20
- - - - -
- - - -
- - - -
50 50
100
(1)(3) (1)(3)
50
- 50 100 50
(1)
(1)(3)
12.7 pipe as a liquid
Ø
Ø15.88
Ø25.40 Ø28.60
(m)
- -
- -
- -
- -
50 -
(3)
50 50
(3) (3)
Ø15.88
Ø25.40 Ø28.60
(m)
- -
- -
- -
50
(3)
50 50
(3) (3)