Hitachi FSXN Series Service Manual page 49

3 Piping work and
refrigerant charge
¿ 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.
Combination of base units
RAS-20
Model
FSXN
RAS-12
Unit A
FSXN
RAS-8
Unit B
FSXN
Connection kit
Gas ø28.6
a
Liquid ø15.88
Gas ø25.4
b
Liquid ø12.7
Gas ø19.05
c
Liquid ø9.53
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
ø22.2
¿ Pipe sizes for RAS-(38-54)FSXN (Combination of three units)
A: main outdoor unit; B: secondary outdoor unit; C: secondary outdoor unit; C1: connection kit 1; C2: connection kit 2; 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.
42
SMGB0065 rev. 1 - 12/2010
B
A
1
b
a
c
C
RAS-22 RAS-24
FSXN FSXN
RAS-14 RAS-14
FSXN FSXN
RAS-8 RAS-10
FSXN FSXN
MC-20AN
ø28.6 ø28.6
ø15.88 ø15.88
ø25.4 ø25.4
ø12.7 ø12.7
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)
(ø22.2-ø25.4)
A
B C
1
a c d
b
e
C1 C2
B
A
b
c
C
RAS-26 RAS-28 RAS-30
FSXN FSXN FSXN
RAS-14 RAS-14 RAS-16
FSXN FSXN FSXN
RAS-12 RAS-14 RAS-14
FSXN FSXN FSXN
ø31.75 ø31.75 ø31.75
ø19.05 ø19.05 ø19.05
ø25.4 ø25.4 ø28.6
ø12.7 ø12.7 ø12.7
ø25.4 ø25.4 ø25.4
ø12.7 ø12.7 ø12.7
Main pipe
ø25.4
ø28.6
ø31.75
ø38.1
–
A
C B
d c
d
e
C2
2
a
RAS-32 RAS-34
FSXN FSXN
RAS-16 RAS-18
FSXN FSXN
RAS-16 RAS-16
FSXN FSXN
MC-21AN
ø31.75 ø31.75
ø19.05 ø19.05
ø28.6 ø28.6
ø12.7 ø15.88
ø28.6 ø28.6
ø12.7 ø12.7
Alternative pipe and reducer
(ø25.4-ø28.6)
(ø28.6-ø31.75)
(ø31.75-ø34.9)
(ø38.1-ø41.3)
–
2
a
C1
RAS-36
FSXN
RAS-18
FSXN
RAS-18
FSXN
ø38.1
ø19.05
ø28.6
ø15.88
ø28.6
ø15.88