Installation manual
8
RXYSQ6P8Y1B9
VRVIII-S System air conditioner
4P357505-1 – 2013.08
When brazing while inserting nitrogen into the piping, nitrogen
must be set to 0.02 MPa with a pressure-reducing valve (=just
enough so that it can be felt on the skin).
1
Refrigerant piping
2
Part to be brazed
3
Taping
4
Hands valve
5
Pressure-reducing valve
6
Nitrogen
9.2.
Cautions for flare connection
See the following table for flare part machining dimensions.
When connecting the flare nuts, apply refrigerant ether or ester
oil to the inside and outside of the flares and turn them three or
four times at first.
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.
1
Piping union
2
Spanner
3
Flare nut
4
Torque wrench
See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)
After all the piping has been connected, use nitrogen to perform
a gas leak check.
10. Refrigerant piping
Field pipes can be installed in four directions.
Figure -
Field pipes in four directions (See figure 5)
A
Forward
B
Backward
C
Sideways
D
Downward
1
Drill
2
Center area around knock-out hole
3
Knock-out hole
4
Slit
5
Connecting pipe liquid (field supply)
6
Bottom frame
7
Front plate
8
Pipe outlet plate
9
Screw front plate
10
Pipe outlet plate screw
11
Connecting pipe gas
When connecting the piping in the lateral direction (on the rear),
remove the piping cover (rear) in reference to figure 8.
1
Piping cover (rear)
To install the connecting pipe to the unit in a downward direction,
make a knock-out hole by penetrating the center area around
the knock-out hole using a Ø6 mm drill. (See figure 5).
Cutting out the two slits makes it possible to install as shown in
figure 5. (Use a metal saw to cut out the slits.)
After knocking out the knock-out, it is recommended to apply
repair paint to the edge and the surrounding end surfaces to
prevent rusting.
The size of the gas side stop valve is Ø15.9 while the inter-unit piping
is Ø19.1. Use the standard supplied accessory piping to make the
connection. See figure 16.
A
Front connection
B
Rear connection
C
Side connection
D
Bottom connection
1
Gas line copper gasket supplied with the unit
(make sure to always use the copper gasket).
2
Gas line piping supplied with the unit
3
Gas piping (field supply)
4
Cut to the appropriate length.
5
Gas line piping supplied with the unit
10.1. Preventing foreign objects from entering
Plug the pipe through-holes with putty or insulating material (field
supply) to stop up all gaps, as shown in the figure.
1
Putty or insulating material (field supply)
Insects or small animals entering the outdoor unit may cause a short
circuit in the electrical box.
Pipe size
Tightening
torque (N•m)
A (mm)
Flare shape
Ø9.5
33~42
12.8~13.2
Ø15.9
63~77
19.3~19.7
Ø19.1
90~110
12.3~23.7
NOTICE
You must use a torque wrench but if you are obliged to
install the unit without a torque wrench, you may follow the
installation method mentioned below.
After the work is finished, make sure to check that
there is no gas leak.
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:
1
2
3
4
5
6
6
12 3
4
R=0.4~0.8
45 2
90 2
A
Pipe size
Further tightening
angle
Recommended
arm length of tool
Ø9.5 (3/8")
60~90°
±200 mm
Ø15.9 (5/8")
30~60°
±300 mm
Ø19.1 (5/8")
20~35°
±450 mm
1
4P357505-1.book Page 8 Tuesday, September 10, 2013 7:59 AM