Toshiba RAV-GM2241AT8-E1 Installation Manual page 15

 Optional installation parts
(Locally procured)
Parts name
Refrigerant piping
A Liquid side: Dia. 12.7 mm
Gas side: Dia. 28.6 mm
B Socket: Dia. 28.6 - Dia. 28.6 mm
Pipe insulating material
C
(polyethylene foam, 10 mm thick)
D Putty, PVC tape
 Refrigerant piping connection
CAUTION
Take note of these 4 important points below for
piping work.
1.Keep dust and moisture away from inside the
connecting pipes.
2.Tightly connect the connection between pipes and
the unit.
3.Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4.Check for gas leaks at connection points.
Piping connection
Liquid side
Outer diameter Thickness
Dia. 12.7 mm 0.8 mm
Gas side
Outer diameter Thickness
Dia. 28.6 mm 1.0 mm (half hard)
27-EN
Flaring
1
Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas
leak.
Q'ty
2
Insert a flare nut into the pipe, and then flare
the pipe.
One each
Use the flare nuts supplied with the air conditioner
or those for R32.
1
Insert a flare nut into the pipe, and flare the pipe.
Use the flare nuts supplied with the air conditioner
1
or flare nuts for R32 or R410A.
However, the conventional tools can be used by
One each
adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Rigid (Clutch type)
Outer dia. of R32 or R410A
copper pipe tool used
12.7
0 to 0.5
19.1
Flaring dia. size: A (Unit: mm)
A
Outer dia. of copper pipe
12.7
19.1
CAUTION
• Do not scratch the inner surface of the flared part
when removing burrs.
• Flare processing under the condition of scratches
on the inner surface of flare processing part will
cause refrigerant gas leak.
• Check that the flared part is not scratched,
deformed, stepped, or flattened, and that there are
no chips adhered or other problems, after flare
processing.
• Do not apply refrigerating machine oil to the flare
surface.
 Connecting the Gas Side Pipe
REQUIREMENT
• Be sure to use the Dia. 19.1 mm pipe and joint
provided as accessories of the outdoor unit to
connect the gas side Dia. 19.1 mm pipe and Dia.
28.6 mm pipe.
• When leading out the pipes toward the front, to one
of the sides or toward the rear, use the Dia.
19.1 mm pipe and elbow provided as accessories of
the outdoor unit, and adjust the bending direction.
Cut the Dia. 19.1 mm pipe to the required length
before using it.
1. Align the provided Dia. 19.1 mm pipe with the pipe
lead-out direction, and shape it so that its end comes
out from the outdoor unit.
B
2. On the outside of the outdoor unit, use the provided
joints, and braze the Dia. 19.1 mm pipe and Dia.
28.6 mm pipe.
Conventional
tool used
1.0 to 1.5
REQUIREMENT
• Before proceeding to brazing the refrigerant pipe,
be sure to pass nitrogen through the pipe to prevent
+0
A
–0.4 oxidation inside it. If nitrogen is not passed through
the pipe, the refrigerating cycle may become
16.6
clogged by oxidized scales.
24.0
– 14 –
 Tightening of connecting part
1
Align the centers of the connecting pipes and
fully tighten the flare nut with your fingers.
Then fix the nut with a wrench as shown in the
figure and tighten it with a torque wrench.
2
As shown in the figure, be sure to use two
wrenches to loosen or tighten the flare nut of
the valve on the gas side. If you use a single
crescent, the flare nut cannot be tightened to
the required tightening torque.
On the other hand, use a single crescent to loosen
or tighten the flare nut of the valve on the liquid
side.
Outer dia. of copper pipe
12.7 mm (diam.)
19.1 mm (diam.)
Joint: Dia. 19.1 – Dia. 25.4 mm
(accessory)
Brazing
Joint: Dia. 25.4 – Dia. 28.6 mm
(accessory)
Brazing
Loosened
Socket: Dia. 28.6 - Dia. 28.6 mm
(procured locally)
Brazing
Dia. 28.6 mm pipe
(procured locally)
(Unit: N•m)
Tightening torque
50 to 62
100 to 120
Cover
Cap
Piping valve
Tightened
Flare nut
Valve at gas side
28-EN