Hitachi RAS-8FSXN - Refrigerant Pipe Connection for Heat Recovery Systems (3 Pipes)

3.1.7 Refrigerant pipe connection for heat recovery systems (3 pipes)
¿ Pipe sizes for RAS-(8-18)FSXN (Base unit)
a
All measurements are in mm.
Model
RAS-8
FSXN
RAS-10
FSXN
RAS-12
FSXN
RAS-14
FSXN
RAS-16
FSXN
RAS-18
FSXN
a
Gas (low pressure) ø19.05 ø22.2 ø25.4 ø25.4 ø28.6 ø28.6
Gas (high
pressure)
ø15.88 ø19.05 ø22.2 ø22.2 ø22.2 ø22.2
Liquid ø9.53 ø9.53 ø12.7 ø12.7 ø12.7 ø15.88
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 Alternative pipe and reducer Main pipe Alternative pipe and reducer
ø9.53 (ø9.53-ø12.7) ø22.2 (ø22.2-ø25.4)
ø12.7 (ø12.7-ø15.88) ø25.4 (ø25.4-ø28.6)
ø15.88 (ø15.88-ø19.05) ø28.6 (ø28.6-ø31.75)
ø19.05 (ø19.05-ø22.2) – –
¿ Pipe sizes for RAS-(20-36)FSXN (Combination of two units)
A
B
C
a
b
c
C
a
b
c
1
B
A
2
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.
3 Piping work and
refrigerant charge
49
SMGB0065 rev. 1 - 12/2010
3