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PIPING WORK AND REFRIGERANT CHARGE
8.3.3
Order of installation of the units
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
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 < 10m.
3 For maintenance, attach "Main unit label" to the service cover (back side surface) of the outdoor unit "A".
Piping outlet
direction
unit side
Piping
connection kit 1
(*): Keep the straight-line distance of 500 mm or more for piping after the piping connection kit.
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 < 10m.
3 For maintenance, attach the main unit label to the service cover (back side surface) of the outdoor unit "A".
A
Piping outlet
direction
Outdoor
unit A
Indoor unit
side
Piping connection kit 2
(*)
(*)
La
Piping
connection kit 1
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.
28
PMML0479 rev.2 - 02/2018
>
>
A
B
Outdoor
Outdoor
unit
unit
A
B
Indoor
Piping
connection kit 2
L
b
(*)
L
(*)
a
>
>
>
B
C
Outdoor
Outdoor
Outdoor
unit B
unit C
(*)
Lb
Lc
Piping connection kit 3
(*): Keep the straight-line distance of 500 mm or more for piping after the piping connection kit.
<
B
C
C
Outdoor
Outdoor
Outdoor
unit
unit
unit
C
C
B
Piping
connection kit 2
L
b
L
L
c
c
<
D
D
C
Outdoor
Outdoor
unit D
unit D
unit C
Ld
Lc
Ld
Piping connection kit 3
<
A
Outdoor
unit
A
Piping outlet
direction
(*)
(*)
Indoor
unit side
L
a
Piping
connection kit 1
<
<
A
B
Outdoor
Outdoor
unit B
unit A
Piping connection kit 2
(*)
La
Lb
Piping outlet
direction
Indoor unit
side
(*)
(*)
Piping
connection
kit 1
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