Fujitsu AIRSTAGE AJH072LNLAH Installation Manual page 11

Outdoor unit
branch kit
(Optional)
To indoor unit
(To main pipe)
To outdoor unit
Liquid pipe
(Field supply)
To outdoor unit
Branch kit restriction when install
Be sure following restriction.
1) Installation angle
Outdoor unit branch kit
Horizontal
A
To indoor unit
PROHIBITED
A
GOOD:
0° to -10°
PROHIBITED
Vertical
PROHIBITED
• Install the outdoor unit branch kit horizontally level, within 0° to -10°, so that the
refrigerant separates evenly.
• Do not install the outdoor unit branch kit vertically.
2) Straight pipe length
To indoor unit
To outdoor unit
(To main pipe)
0.5 m or more
To indoor unit (To main pipe)
0.5 m or more
• Leave the distance 0.5 m or more for straight part to outdoor unit branch kit.
3) For details, refer to the Installation Instruction Sheet of the outdoor unit branch kit.
Fig. Examples of multiple unit installation
(Example 1)
Master unit Slave unit1 Slave unit2
(Example 2)
Master unit Slave unit1 Slave unit2
CAUTION
To prevent the oil from settling in the stopped unit, install the pipes between the
outdoor units so that they are level or are tilted upward to the outdoor units.
Outdoor Capacity
2 Units : Unit 1 ≥ Unit 2
3 Units : Unit 1 ≥ Unit 2 ≥ Unit 3
Joint pipe
(Accessory)
Gas pipe
(Field supply)
To outdoor unit
B
To outdoor unit or
C
next branch kit
PROHIBITED
C B
C GOOD:
0° to -10°
PROHIBITED
PROHIBITED PROHIBITED
To outdoor unit
To outdoor unit
To outdoor unit
To outdoor
unit
(Example 3)
Master
unit
Slave
unit1
Slave
unit2
(1) Examples of multiple unit installation are shown below.
a) Installable patterns
Slave
Master
GOOD
unit 1
unit
To indoor unit
Master Slave
GOOD
unit unit 1
To indoor unit
Slave
GOOD
Master
unit 1
unit
To indoor unit
b) Non-installable patterns
PROHIBITED Master Slave
unit unit 1
To indoor unit
Slave
Master
PROHIBITED
unit unit 1
To indoor unit
Master Slave
PROHIBITED
unit unit 1
To indoor unit
(2) If the pipe length between outdoor unit branch kit and outdoor unit branch kit
(or slave unit) is longer than 2 m, or a lower pipe line exists between outdoor
units, rise for gas pipe should be arranged to eliminate oil from entering into and
remaining at pipes and the stopped outdoor unit. However, there is no need to
provide a rise on the pipe connecting between the master unit and the indoor unit
even if the length exceeds 2m.
Master Slave
unit unit 1
To indoor unit
2 m or less 2 m or less
Master
unit
To indoor unit
2 m or less
2 m or more
Master Slave
unit unit1
To indoor unit
Slave
unit 2
Slave
unit 2
Slave
unit 2
Slave
unit 2
Slave
unit 2
Slave
unit 2
Slave
unit 2
Gas pipe
Slave Slave
unit1 unit2
Rise
(200 mm or more)
Gas pipe
2 m or less
2 m or more
Slave
unit2
Rise
Gas pipe
lower pipe
En-10