Multiple Connections - Fujitsu AIRSTAGE AJH072LNLAH Installation Manual

Fig. B D etail of knockout position (bottom)
Fig. C D etail of knockout position (front)
73
43
5. 3. 2. Removing the pinch pipe
Remove the pinch pipe only when the internal gas is completely drained as shown
on the below instructions.
If gas still remains inside, the piping may crack if you melt the brazing filler metal of
the junction area with a burner.
Before connecting the piping, remove the pinch pipe in accordance with the following
instructions:
1) Verify that the liquid side and gas side 3-way valves are closed.
3-way valve
Pinch pipe
2) Cut the end of the liquid side and gas side pinch pipe and vent the gas inside the
pinch pipe.
End of pinch pipe
En-9
(Unit: mm)
Knockout hole
(Unit: mm)
Knockout
hole
125
199
WARNING
3) After all the gas is vented, melt the brazing filler metal on connecting part using a
torch and remove the pinch pipe.
5. 3. 3. Pipe connection
CAUTION
Seal the pipe route hole with putty (field 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 flare joint.
When removing the pinch pipe or brazing the joint pipe, carry out the work while
cooling down the 3-way valve sufficiently.
• Braze the joint pipe onto the 3-way valves at the liquid and 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 and gas side with the main pipe.
• When installing the strainer, please install it in the following way.
• Braze the strainer onto the gas pipe.
• During the installation, make sure that the arrow on the strainer is directed towards the
product. If the strainer is installed in the wrong direction, the mesh may be damaged.
(Fig.A)
* Be sure to supply nitrogen when brazing.
Fig. A
joint pipe
(Field supply)
Liquid pipe
(Field supply)
To indoor unit
Fig. B
joint pipe
(Field supply)
Strainer
(Accessory)
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) AJH126LNLAH (Outdoor Unit1) + AJH126LNLAH (Outdoor Unit2)
+ AJH090LNLAH (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
(Accessory)
Knockout hole
Gas pipe
(Field supply)
Strainer
(Accessory)
Joint pipe
(Accessory)
Knockout hole