Installation manual
8
RXYSQ6TAV1B
VRV IV-S System air conditioner
4P482260-1 – 2017.03
8.2.
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.
■
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.
9.
R
EFRIGERANT
PIPING
■
Field pipes can be installed in four directions.
Figure -
Field pipes in four directions
When connecting the piping in the lateral direction (on the rear),
remove the piping cover (rear) in reference to
■
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.
■
Cutting out the two slits makes it possible to install as shown in
(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
Only for RXYSQ6.
9.1.
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.
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
NOTE
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:
12 3
4
1
Piping union
2
Spanner
3
Flare nut
4
Torque wrench
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
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
For Sky Air or room air conditioner indoor units only:
Gas line copper gasket supplied with the unit (1) (make
sure to always use the copper gasket).
11
For VRV indoor units only:
Connecting pipe gas (field supply, except RXYSQ6)
1
Piping cover (rear)
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
1
1
Putty or insulating material (field
supply)
4PEN482260-1.book Page 8 Monday, March 20, 2017 8:54 PM
