Hitachi Set Free Série Manuel D'installation page 59

Piping work and refrigerant charge
Size of pipes (Ø mm)
For heat pump systems (2 pipes)
1 Pipe diameter for the outdoor unit.
2 Diameter of the main pipe (from the base unit or connection kit 1 to the first branch)
Outdoor unit (HP)
5
(6/8)
10
(12/14)(12-P)
3 Pipe diameter after first branch
Total indoor unit capacity
after the first branch (HP)
< 6
(6-8.99)
(9-11.99)
(12-15.99)
4 Pipe diameter between multikit and indoor unit
Indoor unit (HP)
(0.8-1.5)
2.0
(2.5-6.0)
8.0
For heat recovery systems (3 pipes)
1 Pipe diameter for the outdoor unit.
2 Diameter of the main pipe (from the base unit or connection kit 1 to the first branch) (3 pipes)
Outdoor unit Gas,
(HP) low pressure
5 ø15.88
(6/8) ø19.05
10 ø22.2
(12/14) ø25.4
16 ø28.58
(18/20) ø28.58
3 Pipe diameter after first branch (3 pipes)
Total HP Gas, low
indoor unit pressure
< 6 ø15.88
(6-8.99) ø19.05
(9-11.99) ø22.2
(12-15.99) ø25.4
(16-17.99) ø28.58
45
PMML0294A_rev.2_02-2014.indb 45
Equivalent pipe length < 100 m
Gas Liquid
ø15.88 ø9.52
ø19.05 ø9.52
ø22.20 ø9.52
ø25.40 ø12.7
.
(3)
Gas Liquid
ø15.88 ø9.52
ø19.05 ø9.52
ø22.2 ø9.52
ø25.4 ø12.7
.
(4)
Gas Liquid
ø12.7 ø6.35
(5)
ø15.88 ø6.35
(5)
ø15.88 ø9.52
ø19.05 ø9.52
Gas, high/low
Liquid
pressure
ø12.7 ø9.52
ø15.88 ø9.52
ø19.05 ø9.52
ø22.2 ø12.7
ø22.2 ø12.7
ø22.2 ø15.88
.
(3)
Gas, high/low
Liquid
pressure
ø12.7 ø9.52
ø15.88 ø9.52
ø19.05 ø9.52
ø22.2 ø12.7
ø22.2 ø12.7
PMML0294A rev.2 - 07/2014
.
(2)
Equivalent pipe length < 100 m
Outdoor unit (HP)
Gas
16 ø28.58
(18-24) ø28.58
(26-34)(24-P) ø31.75
(36-54) ø38.1
Total indoor unit capacity
after the first branch (HP)
(16-17.99)
(18-25.99)
(26-35.99)
≥ 36
Indoor unit (HP) Gas
10.0 ø22.2
16.0 ø28.58
20.0 ø28.58
(2)
Outdoor unit Gas,
(HP) low pressure
(22/24) ø28.58
26 ø31.75
(28-34) ø31.75
36 ø38.1
38-54 ø38.1
Total HP Gas,
indoor unit low pressure
(18-21.99) ø28.58
(22-25.99) ø28.58
(26-35.99) ø31.75
≥36 ø38.1
Liquid
ø12.70
ø15.88
ø19.05
ø19.05
Gas Liquid
ø28.58 ø12.7
ø28.58 ø15.88
ø31.75 ø19.05
ø38.1 ø19.05
Liquid
ø9.52
ø12.7
ø15.88
.
Gas, high/low
Liquid
pressure
ø25.4 ø15.88
ø25.4 ø19.05
ø28.58 ø19.05
ø28.58 ø19.05
ø31.75 ø19.05
Gas, high/low
Liquid
pressure
ø22.2 ø15.88
ø25.4 ø15.88
ø28.58 ø19.05
ø31.75 ø19.05
14/07/2014 12:28:29