Hitachi RAS-8FSXNS2E Installation & Operation Manual page 34

3 For maintenance, attach "Main unit label" to the service cover (back side surface) of the
outdoor unit "A".
A
Outdoor
Unit A
Piping outlet
direction
Indoor unit
side
La
L
L
Piping
connection
kit 1 Piping connection kit 2
L: Keep the straight-line distance of 500mm or more for piping after the piping connection kit.
◆ Refrigerant pipe installation between outdoor units
For refrigerant piping work, the optional piping connection kit is required to branch the pipe
between outdoor units.
The arrangement for outdoor units should be determined depending on the piping direction when
the refrigerant piping work and installation work are planned. When the outdoor unit is installed,
perform the installation work according to the following restrictions.
1 Piping length between piping connection kit 1 and each outdoor unit should be:
✓ LA < LB < LC < 25m
✓ LD - LA ≤ 10m
✓ LC - LA ≤ 10m
Keep the straight-line distance of 500mm or more for piping after the piping connection kit 1.
PMML0628 rev.0 - 05/2023
B
C
D
> >
> >
> >
Outdoor Outdoor Outdoor
Unit B Unit C Unit D
Lb Lc Ld
Piping connection kit 3
Outdoor
Unit A
Indoor unit
LA
side
Piping connection kit 1
B
D C
< <
< <
Outdoor Outdoor Outdoor
Unit D Unit C Unit B
Ld Lc Lb
Piping connection kit 3 Piping connection kit 2
Outdoor Outdoor
Unit B Unit C
LB LC
Piping connection kit 2
A
< <
Outdoor
Unit A
Piping outlet
direction
Indoor unit
side
La
L
L
Piping
connection
kit 1
27
3