Fujitsu AirStage AJ 072GALDH Series Installation Manual page 11

Branch kit restriction when install
Be sure following restriction.
(1) Installation angle
Install the outdoor unit branch kit horizontally level, within 0° to -10°, so that the refrigerant
separates evenly.
To indoor unit
PROHIBITED
GOOD:
0° to -10°
PROHIBITED
Do not install
the outdoor
unit branch kit
vertically.
PROHIBITED
(2) Straight pipe length
Leave the distance 0.5 m or more for straight part to outdoor unit branch kit.
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
(3) About the connecting curvature of field pipe and branch kit:
The field pipe should
be connected to the
branch kit so that the
curved angle on each
side is 3 degree or
less.
(4) For details, refer to the Installation Instruction Sheet of the outdoor unit branch kit.
Examples of multiple unit installation
(Example 1)
(Primary)
(Subordinate 1)
(Subordinate 2)
(Example 2)
(Primary)
(Subordinate 1)
(Subordinate 2)
To outdoor unit
To outdoor unit or next branch kit
PROHIBITED
GOOD:
0° to -10°
PROHIBITED
PROHIBITED PROHIBITED
To outdoor unit
To outdoor
unit
To outdoor unit
To outdoor
unit
*: Allowed value based on "A" (center
of field pipe) at 0.5 m from "B" (junction
of the branch kit).
0.5 m
(Primary)
(Example 3)
(Subordinate 1)
(Subordinate 2)
(5) Examples of multiple unit installation are shown below.
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.
Installable
(Primary)
patterns
GOOD
To indoor unit
(Primary)
GOOD
To indoor unit
(Primary)
GOOD
To indoor unit
Non-install-
able patterns
PROHIBITED
To indoor unit
PROHIBITED
To indoor unit
PROHIBITED
To indoor unit
(6) If the pipe length between outdoor unit branch kit and outdoor unit branch kit (or sub-
ordinate unit) is longer than 2 m, or a lower pipe line exists between outdoor units,
rise for gas pipe (Discharge gas pipe and Suction 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
primary unit and the indoor unit even if the length exceeds 2 m.
(Primary) (Subordinate 1)
To indoor unit
2 m or less
(Primary) (Subordinate 1)
To indoor unit
2 m or less
2 m or more
(Primary) (Subordinate 1)
To indoor unit
CAUTION
(Subordinate 1) (Subordinate 2)
(Subordinate 1) (Subordinate 2)
(Subordinate 2)
(Subordinate 1)
(Primary) (Subordinate 1) (Subordinate 2)
(Primary)
(Subordinate 1) (Subordinate 2)
(Primary)
(Subordinate 1) (Subordinate 2)
(Subordinate 2)
Suction gas pipe
Discharge gas pipe
2 m or less
(Subordinate 2)
Rise
(200 mm or more)
Suction gas pipe
Discharge gas pipe
2 m or less
2 m or more
(Subordinate 2)
Rise
Suction gas pipe
Lower pipe
Discharge gas pipe
En-10