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PIPING WORK AND REFRIGERANT CHARGE
Restrictions for 4 Units 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
A
Piping outlet
direction
Outdoor
unit A
Indoor unit
side
Piping connection kit 2
(*)
(*)
La
Piping
connection kit 1
(*): Keep the straight-line distance of 500 mm 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 Keep the straight-line distance of 500 mm or more after the
piping connection kit 1
•
2 and 3 Units Combination
Outdoor
unit A
Indoor unit side
L
A
Piping connection kit 2
Piping connection kit 1
Outdoor
unit A
500 mm
or more
Indoor unit side
Piping connection kit 1
19
PMML0479 rev.4 - 11/2018
>
>
>
B
C
Outdoor
Outdoor
Outdoor
unit B
unit C
unit D
(*)
Lb
Lc
Piping connection kit 3
Outdoor
Outdoor
unit B
unit C
L
L
B
C
Upstream side
difference
Outdoor
Outdoor
between outdoor
unit C
unit B
units is 100 mm.
Piping connection kit 2
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".
<
D
D
C
Outdoor
Outdoor
unit D
unit C
(*)
Ld
Lc
Ld
Piping connection kit 3
•
4 Units Combination
Indoor unit side
Piping
connection
kit 1
Piping connection kit 2
500 mm
or more
Indoor unit side
Piping connection kit 1
Max. lift
2 Place the piping connection kit lower than the outdoor unit
piping connection.
In case that the piping connection kit is placed higher than
the outdoor unit piping connection, keep 300mm (maximum)
between the piping connection kit and the bottom of the
outdoor unit. Also, provide the oil trap (minimum 200mm)
between the piping connection kit and the outdoor unit.
<
<
A
B
Outdoor
Outdoor
unit B
unit A
Indoor unit
Piping connection kit 2
(*)
La
Lb
Outdoor
Outdoor
Outdoor
Outdoor
unit A
unit B
unit C
unit D
L
L
L
A
B
C
Piping connection kit 3
Outdoor
Outdoor
Outdoor
unit C
unit A
unit B
Piping connection kit 2
Piping connection kit 3
Piping outlet
direction
side
(*)
Piping
connection
kit 1
L
D
Upstream side
Outdoor
unit D
Maximum lift
difference
between
outdoor units
is 100 mm.
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