Refrigerant Pipe Connection For Heat Recovery Systems (3 Pipes) - Hitachi FSXN Series Service Manual

3 Piping work and
refrigerant charge

3.1.7 Refrigerant pipe connection for heat recovery systems (3 pipes)

¿ Pipe sizes for RAS-(8-18)FSXN (Base unit)
Model
Gas (low pressure)
Gas (high
a
pressure)
Liquid
If the main refrigerant pipe specified in the table is not available at the installation location, select the size given in brackets.
In this case, prepare a suitable reducer.
Main pipe
ø9.53
ø12.7
ø15.88
ø19.05
¿ Pipe sizes for RAS-(20-36)FSXN (Combination of two units)
A: main outdoor unit; B: secondary outdoor unit; 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
All measurements are in mm.
49
SMGB0065 rev. 1 - 12/2010
All measurements are in mm.
RAS-8 RAS-10
FSXN FSXN
ø19.05 ø22.2
ø15.88 ø19.05
ø9.53 ø9.53
Alternative pipe and reducer
(ø9.53-ø12.7)
(ø12.7-ø15.88)
(ø15.88-ø19.05)
(ø19.05-ø22.2)
B
A
1
b
a
c
C
a
RAS-12 RAS-14
FSXN FSXN
ø25.4 ø25.4
ø22.2 ø22.2
ø12.7 ø12.7
Main pipe
ø22.2
ø25.4
ø28.6
–
B
A
b
a
c
C
RAS-16 RAS-18
FSXN FSXN
ø28.6 ø28.6
ø22.2 ø22.2
ø12.7 ø15.88
Alternative pipe and reducer
(ø22.2-ø25.4)
(ø25.4-ø28.6)
(ø28.6-ø31.75)
–
2
3