Hitachi RAS-8FSXN - Page 62

2. Diameter of the main pipe (from the base unit or connection kit 1 to the first branch) (3 pipes)
(2)
.
HP outdoor unit
Gas, low
pressure
Gas, high
pressure
Liquid
HP outdoor
unit
Gas, low
pressure
Gas, high
pressure
Liquid
8 ø19.05 ø15.88 ø9.53 (22/24) ø28.6 ø25.4 ø15.88
10 ø22.2 ø19.05 ø9.53 26 ø31.75 ø25.4 ø19.05
(12/14) ø25.4 ø22.2 ø12.7 (28-36) ø31.75 ø28.6 ø19.05
16 ø28.6 ø22.2 ø12.7 (36-54) ø38.1 ø31.75 ø19.05
(18/20) ø28.6 ø22.2 ø15.88 — — — —
3. Pipe diameter after first branch (3 pipes)
(3)
.
Total HP indoor
unit
Gas, low
pressure
Gas, high
pressure
Liquid
Total
HP indoor unit
Gas, low
pressure
Gas, high
pressure
Liquid
< 6 ø15.88 ø12.7 ø9.53 (18-21.99) ø28.6 ø22.2 ø15.88
(6-8.99) ø19.05 ø15.88 ø9.53 (22-25.99) ø28.6 ø25.4 ø15.88
(9-11.99) ø22.2 ø19.05 ø9.53 (26-35.99) ø31.75 ø28.6 ø19.05
(12-15.99) ø25.4 ø22.2 ø12.7 > 36 ø38.1 ø31.75 ø19.05
(16-17.99) ø28.6 ø22.2 ø12.7 — — — —
4. Pipe diameter between the CH unit and the multikit (3 pipes and 2 pipes)
(9)
.
CH unit
Maximum
combination of
indoor units
(8)
Capacity of
indoor units
3 pipes 2 pipes
Gas, low
pressure
Gas, high
pressure
Gas Liquid
CH-6.0N1 7
(0.8-1.5) ø15.88 ø12.7 ø12.7
(15)
ø9.53
(1.6-4.0) ø15.88 ø12.7 ø15.88 ø9.53
(4.1-6.0) ø19.05 ø15.88 ø15.88 ø9.53
CH-10.0N1 8
(6.1-8.0) ø19.05 ø15.88 ø19.05 ø9.53
(8.1-10.0) ø22.2 ø19.05 ø22.2 ø9.53
5. Pipe diameter for 2 pipes and multikit.
Total HP indoor unit Gas Liquid Total HP indoor unit Gas Liquid
< 6 ø15.88 ø9.53 (12-15.99) ø25.4 ø12.7
(6-8.99) ø19.05 ø9.53 (16-17.99) ø28.6 ø12.7
(9-11.99) ø22.2 ø9.53 (18-25.99) ø28.6 ø15.88
6. Pipe diameter between multikit and indoor unit
(4)
.
HP indoor unit Gas Liquid HP indoor unit Gas Liquid
(0.8-1.5) ø12.7 ø6.35
(5)
8.0 ø19.05 ø9.53
2.0 ø15.88 ø6.35
(5)
10.0 ø22.2 ø9.53
(2.5-5.0) ø15.88 ø9.53 — — —
3 Piping work and
refrigerant charge
55
SMGB0065 rev. 1 - 12/2010
3