Refrigerant Pipe Connection For Heat Pump Systems (2 Pipes) - Hitachi FSXN Series Service Manual

3 Piping work and
refrigerant charge
¿ Refrigerant pipe suspension
Only suspend the refrigerant pipes at specific points of the building.
Whenever possible, avoid suspending them from parts subject to
structural movement, e.g. places close to expansion joints or outer
walls, etc.
Prevent the refrigerant pipes from touching weak parts of the
building, such as walls (non-structural), partition walls, ceilings, etc.
Otherwise, operating noise may be caused by pipe vibrations (pay
special attention in the case of short pipes).
A: points where the refrigerant pipes pass through the different
structural parts of the building.
B: indoor unit.
Use suitable suspension systems for refrigeration pipes or clamps
to suspend the pipes, as shown in the diagram.

3.1.6 Refrigerant pipe connection for heat pump systems (2 pipes)

¿
Pipe sizes for RAS-(8-18)FSXN (Base unit)
Model
Gas
a
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
41
SMGB0065 rev. 1 - 12/2010
All measurements are in mm.
RAS-8 RAS-10
FSXN FSXN
ø19.05 ø22.2
ø9.53 ø9.53
Alternative pipe and reducer
(ø9.53-ø12.7)
(ø12.7-ø15.88)
(ø15.88-ø19.05)
(ø19.05-ø22.2)
a
RAS-12 RAS-14
FSXN FSXN
ø25.4 ø25.4
ø12.7 ø12.7
Main pipe
ø22.2
ø25.4
ø28.6
–
RAS-16 RAS-18
FSXN FSXN
ø28.6 ø28.6
ø12.7 ø15.88
Alternative pipe and reducer
(ø22.2-ø25.4)
(ø25.4-ø28.6)
(ø28.6-ø31.75)
–
3