Hitachi RPI-4.0FSN4E - 8 PIPING WORK AND REFRIGERANT CHARGE; Pipe sizes for RAS-(8-16)FSXN1 E and RAS-(5-12)FSXNH(E) (base unit); Pipe sizes for RAS-(18-32)FSXN1 E and RAS-(14-24)FSXNH(E) (Combination of 2 units)

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Pipe sizes for RAS-(8-16)FSXN1E and RAS-(5-12)FSXNH(E) (base unit)
a
NOTE
Ensure that the refrigerant pipe should be connected to the same refrigerant cycle unit.
• For Heat pump systems (2 pipes)
Model RAS-8FSXN1E RAS-10FSXN1E RAS-12FSXN1E RAS-14FSXN1E RAS-16FSXN1E
Piping size
(Ø mm)
a
High/Low
pressure gas
19.05
(19.05 - 22.2)
22.2
(22.2 - 25.4)
25.4
(25.4 - 28.58)
25.4
(25.4 - 28.58)
28.58
(28.58 - 31.75)
Liquid
9.52
(9.52 - 12.7)
9.52
(9.52 - 12.7)
12.7
(12.7 - 15.88)
12.7
(12.7 - 15.88)
12.7
(12.7 - 15.88)
Model RAS-5FSXNH(E) RAS-6FSXNH(E) RAS-8FSXNH(E) RAS-10FSXNH(E) RAS-12FSXNH(E)
Piping size
(Ø mm)
a
High/Low
pressure gas
15.88
(15.88-19.05)
19.05
(19.05 - 22.2)
19.05
(19.05 - 22.2)
22.2
(22.2 - 25.4)
25.4
(25.4 - 28.58)
Liquid
9.52
(9.52 - 12.7)
9.52
(9.52 - 12.7)
9.52
(9.52 - 12.7)
9.52
(9.52 - 12.7)
12.7
(12.7 - 15.88)
• For Heat recovery systems (3 pipes)
Model RAS-8FSXN1E RAS-10FSXN1E RAS-12FSXN1E RAS-14FSXN1E RAS-16FSXN1E
Piping size
(Ø mm)
a
Gas
(low pressure)
19.05
(19.05 - 22.2)
22.2
(22.2 - 25.4)
25.4
(25.4 - 28.58)
25.4
(25.4 - 28.58)
28.58
(28.58 - 31.75)
Gas
(high/low pressure)
15.88
(15.88 - 19.05)
19.05
(19.05 - 22.2)
22.2
(22.2 - 25.4)
22.2
(22.2 - 25.4)
22.2
(22.2 - 25.4)
Liquid
9.52
(9.52 - 12.7)
9.52
(9.52 - 12.7)
12.7
(12.7 - 15.88)
12.7
(12.7 - 15.88)
12.7
(12.7 - 15.88)
Model RAS-5FSXNH(E) RAS-6FSXNH(E) RAS-8FSXNH(E) RAS-10FSXNH(E) RAS-12FSXNH(E)
Piping size
(Ø mm)
a
Gas
(low pressure)
15.88
(15.88 - 19.05)
19.05
(19.05 - 22.2)
19.05
(19.05 - 22.2)
22.2
(22.2 - 25.4)
25.4
(25.4 - 28.58)
Gas
(high/low pressure)
12.7
(12.7 - 15.88)
15.88
(15.88 - 19.05)
15.88
(15.88 - 19.05)
19.05
(19.05 - 22.2)
22.2
(22.2 - 25.4)
Liquid
9.52
(9.52 - 12.7)
9.52
(9.52 - 12.7)
9.52
(9.52 - 12.7)
9.52
(9.52 - 12.7)
12.7
(12.7 - 15.88)
• If the specied main refrigerant piping on the table is not available on site, follow the allowable piping size in parentheses. When
using the main refrigerant piping indicated in parentheses, prepare an appropriate reducer on site.
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Pipe sizes for RAS-(18-32)FSXN1E and RAS-(14-24)FSXNH(E) (Combination of 2 units)
A
Main outdoor unit
B
Secondary outdoor units
C
Connection kit
1
Indoor units on left side
2
Indoor units on right side
Install the outdoor units and connect the refrigerant pipes as shown in the diagram. Please refer to the table to determine the appropriate
connection kit and the diameter of the pipes for each unit.
34
PMML0294A rev.2 - 07/2014
Piping work and refrigerant charge
PMML0294A_rev.2_02-2014.indb 34 14/07/2014 12:28:23