Piping Method - Fujitsu AIRSTAGE K00250LW Addendum

5. 3.

Piping method

5. 3. 1. Opening the knockout hole
CAUTION
Be careful to prevent panel deformation or damaged while opening the knockout
hole.
To prevent cutting of the wiring after the knockout hole was opened, remove the
burrs along the edge.
In addition, to prevent rusting, painting the edge with rust preventive paint is recom-
mended.
The piping can be connected from 2 directions; the front or the bottom.
(Knockout holes are provided so that the piping can be connected from 2 different
directions.)
Use the front knockout hole, as required.
Fig. A Knockout position
Fig. B Detail of knockout position (bottom)
Unit: in (mm)
Knockout hole
3-1/8
(80)
3-1/4
1-5/8 (42)
(82)
Fig. C Detail of knockout position (front)
2-15/16 (75)
3-3/4 (95)
3/8 (10)
3-15/16 (100)
2-7/8 (73)
1-11/16 (43)
5. 3. 2. Removing the pinch pipe
WARNING
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 fi ller metal of
the junction area with a burner.
7-3/4 (197)
Unit : in (mm)
Knockout hole
4-15/16 (125)
7-13/16 (199)
Before connecting the piping, remove the pinch pipe in accordance with the following
instructions:
1) Verify that the liquid side , suction gas side and discharge gas side 3-way valves
are closed.
3-way valves
2) Cut the end of the liquid side ,
suction gas side and discharge gas
side pinch pipe and vent the gas
inside the pinch pipe.
End of pinch pipe
5. 3. 3. Pipe connection
To prevent pipe damage; do not make sharp bends.
Bend the pipe at a radius of 3 in (70 mm) 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
(Locally purchased)
Liquid pipe
(Locally purchased)
3) After all the gas is vented, melt the
brazing fi ller metal on connecting
part using a torch and remove the
pinch pipe.
CAUTION
Joint pipe C
(Accessory)
Joint pipe A
(Accessory)
Knockout hole
Suction gas pipe
(Locally purchased)
Discharge gas pipe
(Locally purchased)
To RB unit or indoor unit
En-10