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7.7. Connecting the refrigerant piping
1
Installation of refrigerant branching kit.
For installation, refer to the installation manual delivered with the
kit. Follow the conditions listed below:
Mount the refnet joint so that it branches either horizontally
(see view A) or vertically.
1
Horizontal surface
2
Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in
the figure below.
1
2
1
Left-side connection
2
Front connection
3
Right-side connection
Front connection:
Remove the stop valve cover to connect.
Side (bottom) connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame.
(See figure 7)
A
Front connection
Remove the stop valve cover to connect.
B
Side (bottom) connection:
Remove the knock holes on the bottom frame and route the piping
under the bottom frame
1
Flange
2
Gas side pipe (1)(2)(3) supplied with the unit.
3
Flare nut
4
Brazing
5
Liquid side piping (field supply)
6
Knockout hole (use a hammer)
7
Gas side piping (field supply)
Precautions when knocking out knockout holes
Be sure to avoid damaging the casing.
After knocking out the holes, we recommend you paint the
edges and areas around the edges using the repair paint to
prevent rusting.
When passing electrical wiring through the knock holes, wrap
the wiring with protective tape to prevent damage.
3
Make sure to perform the piping installation within the range of
the maximum allowable pipe length, allowable level difference
and
allowable
length
"7.4. Allowable pipe length and height difference" on page
4
For installation of the refrigerant branching kit (Refnet), refer to
the installation manual delivered with the kit.
5
Pipe connection
Only use the flare nuts included with the unit.
Using different flare nuts may cause the refrigerant to leak.
Be sure to perform a nitrogen blow when brazing.
(Brazing without performing nitrogen replacement or
releasing nitrogen into the piping will create large quantities
of oxidized film on the inside of the pipes, adversely affecting
valves and compressors in the refrigerating system and
preventing normal operation.)
RZQ200+250B8W1B
Split system air conditioner
4PW25544-1A
(See figure 10)
3
(See figure 7)
after
branching
as
indicated
NOTE
The pressure regulator for the nitrogen released when
doing the brazing should be set to 0.02 MPa or less.
(See figure 11)
1
2
3
4
5
6
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
FLARE SHAPE and FLARENUT TIGHTENING TORQUE
Precautions when connecting pipes
See the following table for flare part machining dimensions.
When connecting the flare nuts, apply refrigerant oil to the inside
and outside of the flares and turn them three or four times at first.
(Use ester oil or ether oil.)
When loosening a flare nut, always use two wrenches in
combination.
When connecting the piping, always use a spanner and torque
wrench in combination to tighten the flare nut.
2
4
1
3
See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)
Pipe size
Ø9.5
Ø12.7
Ø15.9
After all the piping has been connected, use nitrogen to perform
a gas leak check.
NOTE
You must use a torque wrench but if you are unable to
install the unit with a torque wrench, you may follow the
installation method mentioned below.
After the work is finished, make sure to check that
in
there is no gas leak.
5.
When you keep on tightening the flare nut with a
spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten
the flare nut within the angle shown below:
Pipe size
Ø9.5 (3/8")
Ø12.7 (1/2")
Ø15.9 (5/8")
Refrigerant piping
Location to be brazed
Nitrogen
Taping
Manual valve
Regulator
1
Piping union
2
Spanner
3
Flare nut
4
Torque wrench
Tightening
Torque (N•m)
A (mm)
32.7~39.9
12.8~13.2
49.5~60.3
16.2~16.6
61.8~75.4
19.3~19.7
Further
tightening angle
60~90°
30~60°
30~60°
Flare shape
90 ±2
A
R=0.4~0.8
Recommended
arm length of tool
200 mm
250 mm
300 mm
Installation manual
6
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