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5. Refrigerant Piping Work
5.3 Caution about Outdoor Unit Installation
When the installation and piping work for the multiple
outdoor units are performed, it is required that the
arrangement for outdoor units and piping length be
determined. Perform securely the installation work
according to the following restrictions. If the arrangement
for outdoor units is incorrect, it may cause flowback of
the refrigerant and result in failure of outdoor unit.
<Restrictions for 2 and 3 Unit Combination>
1. For 2 and 3 outdoor units combination, align the
outdoor units from largest capacity to smallest as
A > B > C and outdoor unit "A" should be connected
to the piping connection kit 1.
2. The piping length between the piping connection kit
1 and the outdoor unit should be
La < Lb < Lc < 25m.
3. For maintenance, attach "Main unit label" to the
service cover (back side surface) of the outdoor unit
"A".
Outdoor Unit
Piping Outlet
Direction
Indoor Unit
Side
Piping
Connection Kit 2
Piping
L
a
Connection Kit 1
: Keep the straight-line distance of 500mm or more for piping
a er the piping connection kit.
<
B
C
Outdoor Unit
Outdoor Unit
C
B
Piping
Connection Kit 2
L
b
L
c
: Keep the straight-line distance of 500mm or more for piping
a er the piping connection kit.
31
>
>
A
B
Outdoor Unit
Outdoor Unit
A
B
L
b
<
A
Outdoor Unit
A
Piping Outlet
Direction
Indoor Unit
Side
L
a
Piping
Connection Kit 1
<Restrictions for 4 Unit Combination>
1. For 4 outdoor unit combination, align the outdoor
units from largest capacity to smallest as A > B > C > D.
The outdoor units "A" and "B" should be connected
to the piping connection kit 2 and the outdoor unit
"C" and "D" should be connected to the piping
connection kit 3.
2. The piping length between the piping connection kit
1 and each outdoor unit should be
La < Lb < Lc < Ld < 25m.
3. For maintenance, attach the main unit label to the
service cover (back side surface) of the outdoor unit
"A".
Piping Outlet
Direction
Indoor Unit
Side
C
C
Piping
Connection
Kit 1
: Keep the straight-line distance of 500mm or more for piping
a er the piping connection kit.
D
L
c
Outdoor Unit
D
Ld
Piping Connection Kit 3
: Keep the straight-line distance of 500mm or more for piping
a er the piping connection kit.
> >
A
B
Outdoor Unit
Outdoor Unit
A
La
Lb
Piping Connection Kit 2
< <
< <
< <
B
C
Outdoor Unit
Outdoor Unit
Outdoor Unit
C
B
Lc
La
Lb
Piping Connection Kit 2
> >
> >
C
D
Outdoor Unit
Outdoor Unit
B
C
D
Ld
Lc
Piping Connection Kit 3
A
A
Piping Outlet
Direction
Indoor Unit
Side
Piping
Connection
Kit 1
A16381Z84L-rev.1
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