Multiple Connections - Fujitsu AIRSTAGE AJY126GALH Installation Manual

5. 3. 3. Pipe connection
CAUTION
Seal the pipe route hole with putty (fi eld supply) such that there are no gaps.
Small insects or animals that are trapped in the outdoor unit may cause a short circuit
in the electrical component box.
To prevent pipe damage; do not make sharp bends.
Bend the pipe at a radius of 70mm or greater.
Do not bent pipe many times at same part to prevent break.
After completing all the pipe connection by brazing, perform the indoor unit pipe con-
nection with a fl are joint.
When removing the pinch pipe or brazing the joint pipe, carry out the work while
cooling down the 3-way valve suffi ciently.
• Braze the joint pipe onto the 3-way valves at the liquid , suction gas and discharge
gas side.
Install the joint pipe appropriately so that it can be connected easily with the main
pipe.
• Braze the joint pipe at the liquid , suction gas and discharge gas side with the main
pipe.
* Be sure to supply nitrogen when brazing.
Fig. A
Joint pipe
(Field supply)
Liquid pipe
To RB unit or indoor unit
(Field supply)
Fig. B
Joint pipe
(Field supply)
5. 4.

Multiple connections

CAUTION
• When connecting multiple (maximum 3) units, be sure to install the unit with the
largest capacity nearest to the indoor unit.
For example) AJ 108GALH (Outdoor Unit1) + AJ A90GALH (Outdoor Unit2) +
AJ A72GALH (Outdoor Unit3)
• When connecting multiple units, set the unit with the largest capacity as the master
unit, and the rest as the slave units.
(Refer to 7. Field Setting)
• When connecting multiple units, use the optional outdoor unit branch kit.
Joint pipe D
(Accessory)
Joint pipe B
(Accessory)
Knockout hole
Suction gas pipe
(Field supply)
Discharge gas pipe
(Field supply)
Joint pipe C
(Accessory or fi eld supply) *1
Joint pipe A
(Accessory or fi eld supply) *1
Knockout hole
*1) Field supply and accessory
depend on the model, so for
details, refer "2.3. Accessories".
Outdoor unit
branch kit
(Optional)
To indoor unit
(To main pipe)
To outdoor unit
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 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
Outdoor Capacity
2 Units : Unit 1 ≥ Unit 2
3 Units : Unit 1 ≥ Unit 2 ≥ Unit 3
Joint pipe
(Accessory)
Liquid pipe
(Field supply)
Discharge gas pipe
(Field supply)
Suction 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
To outdoor unit
To outdoor unit
To outdoor unit
To outdoor
unit
(Example 3)
Master
unit
Slave
unit1
Slave
unit2
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